WO2004103275A2 - Compositions and methods for the preparation of human growth hormone glycosylation mutants - Google Patents
Compositions and methods for the preparation of human growth hormone glycosylation mutants Download PDFInfo
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- WO2004103275A2 WO2004103275A2 PCT/US2004/014254 US2004014254W WO2004103275A2 WO 2004103275 A2 WO2004103275 A2 WO 2004103275A2 US 2004014254 W US2004014254 W US 2004014254W WO 2004103275 A2 WO2004103275 A2 WO 2004103275A2
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- Prior art keywords
- growth hormone
- human growth
- seq
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- mutant human
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- 229960001722 verapamil Drugs 0.000 description 1
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- 229960003048 vinblastine Drugs 0.000 description 1
- JXLYSJRDGCGARV-XQKSVPLYSA-N vincaleukoblastine Chemical compound C([C@@H](C[C@]1(C(=O)OC)C=2C(=CC3=C([C@]45[C@H]([C@@]([C@H](OC(C)=O)[C@]6(CC)C=CCN([C@H]56)CC4)(O)C(=O)OC)N3C)C=2)OC)C[C@@](C2)(O)CC)N2CCC2=C1NC1=CC=CC=C21 JXLYSJRDGCGARV-XQKSVPLYSA-N 0.000 description 1
- OGWKCGZFUXNPDA-XQKSVPLYSA-N vincristine Chemical compound C([N@]1C[C@@H](C[C@]2(C(=O)OC)C=3C(=CC4=C([C@]56[C@H]([C@@]([C@H](OC(C)=O)[C@]7(CC)C=CCN([C@H]67)CC5)(O)C(=O)OC)N4C=O)C=3)OC)C[C@@](C1)(O)CC)CC1=C2NC2=CC=CC=C12 OGWKCGZFUXNPDA-XQKSVPLYSA-N 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/575—Hormones
- C07K14/61—Growth hormones [GH] (Somatotropin)
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P5/00—Drugs for disorders of the endocrine system
- A61P5/06—Drugs for disorders of the endocrine system of the anterior pituitary hormones, e.g. TSH, ACTH, FSH, LH, PRL, GH
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
Definitions
- Human growth Hormone (hGH) and agonist variants thereof are members of a family of recombinant proteins, described in U.S. Pat. No. 4,658,021 and U.S. Pat. No. 5,633,352. Their recombinant production and methods of use are detailed in U.S. Pat. Nos. 4,342,832, 4,601,980; U.S. Pat. No. 4,898,830; U.S. Pat. No. 5,424,199; and U.S. Pat. No. 5,795,745.
- Human growth hormone participates in various aspects of the regulation of normal human growth and development. Through interaction with its receptors, this 22 kDa pituitary hormone modulates a multitude of biological effects, such as linear growth
- hGH Both purified and recombinant hGH have been used for treating conditions and diseases due to hGH deficiency, e.g., dwarfism in children.
- an immunogenic response to an administered peptide can neutralize the peptide and/or lead to the development of an allergic response in the patient.
- Other deficiencies of therapeutic glycopeptides include suboptimal potency and rapid clearance rates.
- the problems inherent in peptide therapeutics are recognized in the art, and various methods of eliminating the problems have been investigated. For example, to provide soluble peptide therapeutics, synthetic polymers have been attached to the peptide backbone.
- PEG Poly(ethyleneglycol)
- PEG poly(ethyleneglycol)
- the use of to PEG to derivatize peptide therapeutics has been demonstrated to reduce the immunogenicity of the peptides.
- U.S. Pat. No. 4,179,337 (Davis et al.) concerns non-immunogenic polypeptides, such as enzymes and peptide hormones coupled to polyethylene glycol (PEG) or polypropylene glycol.
- poly(ethyleneglycol) is added in an essentially random, non-specific manner to reactive residues on a peptide backbone.
- a derivitization strategy that results in the formation of a specifically labeled, readily characterizable, essentially homogeneous product.
- a promising route to preparing specifically labeled peptides is through the use of enzymes, such as glycosyltransferases to append a modified sugar moiety onto a peptide.
- Enzyme-based syntheses have the advantages of regioselectivity and stereoselectivity. Moreover, enzymatic syntheses are performed using unprotected substrates. Three principal classes of enzymes are used in the synthesis of carbohydrates, glycosyltransferases (e.g. , sialyltransferases, oligosaccharyltransferases, N- acetylglucosaminyltransferases), and glycosidases.
- glycosyltransferases e.g. , sialyltransferases, oligosaccharyltransferases, N- acetylglucosaminyltransferases
- glycosidases are further classified as exoglycosidases (e.g., ⁇ -mannosidase, ⁇ -glucosidase), and endoglycosidases (e.g., Endo-A, Endo-M).
- exoglycosidases e.g., ⁇ -mannosidase, ⁇ -glucosidase
- endoglycosidases e.g., Endo-A, Endo-M
- Glycosyltransferases modify the oligosaccharide structures on glycopeptides, producing specific products with good stereochemical and regiochemical control. Glycosyltransferases are used to prepare oligosaccharides and to modify terminal N- and O- on glycopeptides produced in mammalian cells.
- the terminal oligosaccharides of glycopeptides have been completely sialylated and/or fucosylated to provide more consistent sugar structures, which improves glycopeptide pharmacodynamics and a variety of other biological properties.
- ⁇ -1,4- galactosyltransferase was used to synthesize lactosamine, an illustration of the utility of glycosyltransferases in the synthesis of carbohydrates (see, e.g., Wong et al, J. Org. Chem. 47: 5416-5418 (1982)).
- ⁇ - sialyltransferases to transfer sialic acid from cytidine-5'-monophospho-N-acetylneuraminic acid to the 3-OH or 6-OH of galactose (see, e.g., Kevin et al, Chem. Eur. J. 2: 1359-1362 (1996)).
- Fucosyltransferases are used in synthetic pathways to transfer a fucose unit from guanosine-5'-diphosphofucose to a specific hydroxyl of a saccharide acceptor.
- Ichikawa prepared sialyl Lewis-X by a method that involves the fucosylation of sialylated lactosamine with a cloned fucosyltransferase (Ichikawa et al, J. Am. Chem. Soc. 114: 9283- 9298 (1992)).
- a cloned fucosyltransferase for a discussion of recent advances in glycoconjugate synthesis for therapeutic use see, Koeller et al, Nature Biotechnology 18: 835-841 (2000). See also, U.S. Patent No. 5,876,980; 6,030,815; 5,728,554; 5,922,577; and WO/9831826.
- Glycosidases can also be used to prepare saccharides. Glycosidases normally catalyze the hydrolysis of a glycosidic bond. Under appropriate conditions, however, they can be used to form this linkage. Most glycosidases used for carbohydrate synthesis are exoglycosidases; the glycosyl transfer occurs at the non-reducing terminus of the substrate. The glycosidase takes up a glycosyl donor in a glycosyl-enzyme intermediate that is either intercepted by water to give the hydrolysis product, or by an acceptor, to give a new glycoside or oligosaccharide.
- An exemplary pathway using an exoglycosidase is the synthesis of the core trisaccharide of all N-linked glycopeptides, including the difficult ⁇ - mannoside linkage, which was formed by the action of ⁇ -mannosidase (Singh et al, Chem. Commun. 993-994 (1996)).
- a mutant glycosidase has been prepared in which the normal nucleophilic amino acid within the active site is changed to a non-nucleophilic amino acid.
- the mutant enzymes do not hydrolyze glycosidic linkages, but can still form them.
- the mutant glycosidases are used to prepare oligosaccharides using an ⁇ -glycosyl fluoride donor and a glycoside acceptor molecule (Withers et al, U.S. Patent No. 5,716,812).
- mutant glycosidases are ilstful tor tytlM ⁇ -
- endoglycosidases are also utilized to prepare carbohydrates. Methods based on the use of endoglycosidases have the advantage that an oligosaccharide, rather than a monosaccharide, is transferred. Oligosaccharide fragments have been added to substrates using en o- ⁇ -N- acetylglucosamines such as endo- ⁇ , endo-M (Wang et al, Tetrahedron Lett. 37: 1975-1978); and Haneda et al, Carbohydr. Res. 292: 61-70 (1996)).
- the tetrasaccharide sialyl Lewis X was then enzymatically rebuilt on the remaining GlcNAc anchor site on the now homogenous protein by the sequential use of ⁇ -1,4- galactosyltransferase, ⁇ -2,3-sialyltransferase and ⁇ -l,3-fucosyltransferase V. Each enzymatically catalyzed step proceeded in excellent yield.
- Brossmer et al. (U.S. Patent No. 5,405,753) discloses the formation of a fluorescent-labeled cytidine monophosphate ("CMP") derivative of sialic acid and the use of the fluorescent glycoside in an assay for sialyl transferase activity and for the fluorescent-labeling of cell surfaces, glycoproteins and gangliosides.
- CMP cytidine monophosphate
- Gross et al. (Analyt. ⁇ Vkh ⁇ h W6 m ⁇ 9: ⁇ bb a similar assay.
- Bean et al. (U.S. Patent No.
- 5,432,059 discloses an assay for glycosylation deficiency disorders utilizing reglycosylation of a deficiently glycosylated protein.
- the deficient protein is reglycosylated with a fluorescent- labeled CMP glycoside.
- Each of the fluorescent sialic acid derivatives is substituted with the fluorescent moiety at either the 9-position or at the amine that is normally acetylated in sialic acid.
- the methods using the fluorescent sialic acid derivatives are assays for the presence of glycosyltransferases or for non-glycosylated or improperly glycosylated glycoproteins.
- the assays are conducted on small amounts of enzyme or glycoprotein in a sample of biological origin.
- the enzymatic derivatization of a glycosylated or non-glycosylated peptide on a preparative or industrial scale using a modified sialic acid has not been disclosed or suggested.
- Enzymatic methods have also been used to activate glycosyl residues on a glycopeptide towards subsequent chemical elaboration.
- the glycosyl residues are typically activated using galactose oxidase, which converts a terminal galactose residue to the corresponding aldehyde.
- the aldehyde is subsequently coupled to an amine-containing modifying group.
- Casares et al. (Nature Biotech. 19: 142 (2001)) have attached doxorubicin to the oxidized galactose residues of a recombinant MHCII-peptide chimera. ;
- Glycosyl residues have also been modified to bear ketone groups.
- Mahal and co-workers (Science 276: 1125 (1997)) have prepared N-levulinoyl mannosamine (“ManLev”), which has a ketone functionality at the position normally occupied by the acetyl group in the natural substrate. Cells were treated with the ManLev, thereby incorporating a ketone group onto the cell surface. See, also Saxon et al, Science 287: 2007 (2000); Hang et al, J. Am. Chem. Soc. 123: 1242 (2001); Yarema et /., J Biol. Chem.
- Carbohydrates are attached to glycopeptides in several ways of which N-linked to asparagine and mucin-type O-linked to serine and threonine are the most relevant for recombinant glycoprotein therapeuctics.
- a determining factor for initiation of glycosylation of a protein is the primary sequence context, although clearly other factors including protein region and conformation play roles.
- N-linked glycosylation occurs at the consensus sequence NXS/T, where X can be any amino acid but proline.
- the present invention answers these needs by providing hGH mutants that contain newly introduced N-linked or O-linked glycosylation sites, providing flexibility in glycosylation and/or glycopegylation of these recombinant hGH mutants.
- the invention provides an industrially practical method for the modification of N- or O-linked mutant hGH peptides with modifying groups such as water-soluble polymers, therapeutic moieties, biomolecules, and the like.
- modifying groups such as water-soluble polymers, therapeutic moieties, biomolecules, and the like.
- the modified mutant hGH has improved properties, which enhance its use as a therapeutic or diagnostic agent.
- the present invention provides an isolated nucleic acid comprising a polynucleotide sequence encoding a mutant human growth hormone.
- the mutant human growth hormone comprises an N-linked or O-linked glycosylation site that is not present in wild-type human growth hormone.
- the wild-type human growth hormone has the amino acid sequence of SEQ ID NO:l or SEQ ID NO:2.
- the mutant human growth hormone includes the amino acid sequence of SEQ ID NO:3, 4, 5, 6, 7, 8, or 9.
- the present invention provides an expression cassette or a cell that comprises a nucleic acid, e.g., an isolated nucleic acid, including a polynucleotide sequence encoding a mutant human growth hormone.
- the mutant human growth hormone includes an N-linked or O-linked glycosylation site that is not present in the wild-type human growth hormone.
- the present invention provides a mutant human growth hormone, that includes an N-linked or O-linked glycosylation site that is not present in the wild-type human growth hormone.
- the wild-type human growth hormone has the amino acid sequence of SEQ ID NO:l or SEQ ID NO:2.
- the mutant human growth hormone comprises the amino acid sequence of SEQ ID NO:3, 4, 5, 6, 7, 8, or 9. a method for making a mutant human growth hormone that includes an N-linked or O-linked glycosylation site that is not present in the wild-type human growth hormone. This method includes the steps of recombinantly producing the mutant human growth hormone, and glycosylating the mutant human growth hormone at the new glycosylation site.
- the wild-type human growth hormone has the amino acid sequence of SEQ ID NO: 1 or SEQ ID NO:2.
- the mutant human growth hormone comprises the amino acid sequence of SEQ ID NO:3, 4, 5, 6, 7, 8, or 9.
- the present invention provides a pharmaceutical composition having a therapeutically effective amount of a mutant human growth hormone that includes an N-linked or O-linked glycosylation site not present in the wild-type human growth hormone.
- the wild-type human growth hormone has the amino acid sequence of SEQ ID NO: 1 or SEQ ID NO:2.
- the mutant human growth hormone comprises the amino acid sequence of SEQ ID NO:3, 4, 5, 6, 7, 8, or 9.
- the present invention provides a method for treating human growth hormone deficiency in a subject.
- the method includes administering to the subject an amount of a mutant human growth hormone effective to treat or ameliorate the growth hormone deficiency.
- the mutant human growth hormone used in this method comprises an N-linked or O-linked glycosylation site that does not exist in the corresponding wild-type human growth hormone.
- the corresponding wild-type human growth hormone has the amino acid sequence of SEQ ID NO:l or SEQ ID NO:2.
- the mutant human growth hormone comprises the amino acid sequence of SEQ ID NO:3, 4, 5, 6, 7, 8, or 9.
- the mutant human growth hormone is optionally conjugates to one or more modifying group, preferably via glycoconjugation giving rise to a glycosyl linking group between the glycosylation site and the modifying group.
- An exemplary modifying group is poly(ethylene glycol).
- FIG. 1 is the amino acid sequences of GH-N (pituitary derived hGH) and GH-N (placental derived hGH). The arrows indicate the amino acid position for a mutational introduction of (GH- ⁇ ) or a naturally existing (GH-N) ⁇ -linked glycosylation site.
- FIG. 2 is the crystal structure depiction of a glycosylated GH- ⁇ mutant hGH (Lysl40 to Asnl40) and its receptor polypeptide.
- FIG. 3 are glycoPEGylation schemes for insect cell and mammalian cell produced hGH ⁇ -linked glycan mutants.
- FIG. 4 shows the glycoPEGylation of an Escherichia coli produced hGH O-linked glycan mutant.
- FIG. 5 displays alternate mutants of GH- ⁇ to introduce glycosylation sites.
- the arrows indicate the protein loop regions of GH- ⁇ into which a glycosylation site may be introduced.
- FIG. 6 are the amino acid sequences of six (6) different O-linked glycosylation sites that may be introduced into pituitary derived hGH (GH- ⁇ ).
- GH- ⁇ pituitary derived hGH
- the wild-type amino acid sequence for GH- ⁇ is also shown for comparison.
- the arrows indicate the threonine residue of the GH- ⁇ glycan mutant on which O-linked glycosylation will occur.
- FIG. 7 are the amino acid sequences of hGH O-linked GH- ⁇ mutant 134(rtg) -> ttt and hGH O-linked 5' GH- ⁇ mutant in which amino acids -3 to -1 (ptt) are inserted at the amino terminus, resulting in a 194 amino acid hGH polypeptide.
- FIG. 8 are the amino acid sequences of hGH O-linked GH- ⁇ mutant 134(rtg) -» ttg and hGH O-linked 5' GH- ⁇ mutant in which amino acids -3 to -1 (mvt) are inserted at the amino terminus, resulting in a 194 amino acid hGH polypeptide.
- FIG. 9A depicts the amino acid sequence of mature human growth hormone (GH- ⁇ ) (SEQ ID NO: 1).
- FIG. 9B depicts the amino acid sequence of mature human growth hormone (GH-N) (SEQ ID ⁇ ,O:2).
- FIG. 9C depicts the amino acid sequence of human growth hormone mutant 1 (SEQ ID NO:3).
- FIG. 9D depicts the amino acid sequence of human growth hormone mutant 2 (SEQ ID NO:4).
- FIG. 9E depicts the amino acid sequence of human growth hormone mutant 3 (SEQ ID NO: 5).
- FIG. 9F depicts the amino acid sequence of human growth hormone mutant 4 (SEQ ID NO: 6).
- FIG. 9G depicts the amino acid sequence of human growth hormone mutant 5 (SEQ ID NO:7).
- FIG. 9H depicts the ammo aeid ⁇ feq ⁇ 'eft ' ce ⁇ ol li ⁇ ffia ' n ⁇ fr ⁇ 'wth hormone mutant 6 (SEQ ID NO:8).
- FIG. 91 depicts the amino acid sequence of human growth hormone mutant 7 (SEQ ID NO:9).
- nucleic acid or “polynucleotide” refers to deoxyribonucleic acids
- DNA DNA
- RNA ribonucleic acids
- DNA DNA
- RNA ribonucleic acids
- the term encompasses nucleic acids containing known analogues of natural nucleotides that have similar binding properties as the reference nucleic acid and are metabolized in a manner similar to naturally occurring nucleotides.
- a particular nucleic acid sequence also implicitly encompasses conservatively modified variants thereof (e.g., degenerate codon substitutions), alleles, orthologs, SNPs, and complementary sequences as well as the sequence explicitly indicated.
- degenerate codon substitutions may be achieved by generating sequences in which the third position of one or more selected (or all) codons is substituted with mixed- base and/or deoxyinosine residues (Batzer et al, Nucleic Acid Res. 19:5081 (1991); Ohtsuka et al, J. Biol. Chem. 260:2605-2608 (1985); and Rossolini et al, Mol Cell. Probes 8:91-98 (1994)).
- nucleic acid is used interchangeably with gene, cDNA, and mRNA encoded by a gene.
- gene means the segment of DNA involved in producing a polypeptide chain. It may include regions preceding and following the coding region (leader and trailer) as well as intervening sequences (introns) between individual coding segments (exons).
- nucleic acid or protein when applied to a nucleic acid or protein, denotes that the nucleic acid or protein is essentially free of other cellular components with which it is associated in the natural state. It is preferably in a homogeneous state although it can be in either a dry or aqueous solution. Purity and homogeneity are typically determined using analytical chemistry techniques such as polyacrylamide gel electrophoresis or high performance liquid chromatography. A protein that is the predominant species present in a preparation is substantially purified. In particular, an isolated gene is separated from open reading frames that flank the gene and encode a protein other than the gene of interest. The term "purified" denotes that a nucleic acid or protein gives rise to essentially one band in an electrophoretic gel.
- nucleic acid or protein is at least 85% pure, more preferably at least 95% pure, and most preferably at least 99% pure.
- Naturally occurring amino acids are those encoded by the genetic code, as well as those amino acids that are later modified, e.g., hydroxyproline, ⁇ - carboxyglutamate, and O-phosphoserine.
- Amino acid analogs refers to compounds that have the same basic chemical structure as a naturally occurring amino acid, i.e., an ⁇ carbon that is bound to a hydrogen, a carboxyl group, an amino group, and an R group, e.g., homoserine, norleucine, methionine sulfoxide, methionine methyl sulfonium. Such analogs have modified R groups (e.g., norleucine) or modified peptide backbones, but retain the same basic chemical structure as a naturally occurring amino acid.
- Amino acid mimetics refers to chemical compounds having a structure that is different from the general chemical structure of an amino acid, but that functions in a manner similar to a naturally occurring amino acid.
- Amino acids may be referred to herein by either the commonly known three letter symbols or by the one-letter symbols recommended by the IUPAC-IUB Biochemical Nomenclature Commission. Nucleotides, likewise, may be referred to by their commonly accepted single-letter codes.
- "Conservatively modified variants” applies to both amino acid and nucleic acid sequences. With respect to particular nucleic acid sequences, “conservatively modified variants” refers to those nucleic acids that encode identical or essentially identical amino acid sequences, or where the nucleic acid does not encode an amino acid sequence, to essentially identical sequences. Because of the degeneracy of the genetic code, a large number of functionally identical nucleic acids encode any given protein.
- the codons GCA, GCC, GCG and GCU all encode the amino acid alanine.
- the codon can be altered to any of the corresponding codons described without altering the encoded polypeptide.
- Such nucleic acid variations are "silent variations," which are one species of conservatively modified variations. Every nucleic acid sequence herein that encodes a polypeptide also describes every possible silent variation of the nucleic acid.
- each codon in a nucleic acid can be modified to yield a functionally identical molecule.
- Accordingl 1 ; afeh' l ⁇ nt Jl variIlior ⁇ ''6 , f a" ' nucleic -acid that encodes a polypeptide is implicit in each described sequence.
- amino acid sequences one of skill will recognize that individual substitutions, deletions or additions to a nucleic acid, peptide, polypeptide, or protein sequence which alters, adds or deletes a single amino acid or a small percentage of amino acids in the encoded sequence is a "conservatively modified variant" where the alteration results in the substitution of an amino acid with a chemically similar amino acid. Conservative substitution tables providing functionally similar amino acids are well known in the art. Such conservatively modified variants are in addition to and do not exclude polymorphic variants, interspecies homologs, and alleles of the invention.
- Amino acids may be referred to herein by either their commonly known three letter symbols or by the one-letter symbols recommended by the IUPAC-IUB Biochemical Nomenclature Commission. Nucleotides, likewise, may be referred to by their commonly accepted single-letter codes.
- amino acid residues are numbered according to their relative positions from the left most residue, which is numbered 1, in an unmodified wild- type polypeptide sequence.
- Proximate a proline residue refers to an amino acid that is less than about 10 amino acids removed from a proline residue, preferably, less than about 9, 8, 7, 6 or 5 amino acids removed from a proline residue, more preferably, less than about 4, 3, 2 or FT ⁇ si ⁇ ue's r ⁇ move ⁇ 'irom.a ⁇ iOiine'Tesidue.
- the amino acid "proximate a proline residue” may be on the C- or N-terminal side of the proline residue.
- Polypeptide “peptide,” and “protein” are used interchangeably herein to refer to a polymer of amino acid residues. All three terms apply to amino acid polymers in which one or more amino acid residue is an artificial chemical mimetic of a corresponding naturally occurring amino acid, as well as to naturally occurring amino acid polymers and non- naturally occurring amino acid polymers. As used herein, the terms encompass amino acid chains of any length, including full-length proteins, wherein the amino acid residues are linked by covalent peptide bonds.
- mutating refers to the deletion, insertion, or substitution of any nucleotide or amino acid residue, by chemical, enzymatic, or any other means, in a polynucleotide sequence encoding a wild-type human growth hormone or the amino acid sequence of a wild-type human growth hormone, respectively, such that the amino acid sequence of the resulting human growth hormone comprises at least one N- or O-linked glycosylation site that does not exist in the corresponding wild-type human growth hormone.
- both conservative and non-conservative substitutions may be used to create a hGH mutant that contains a new N- or O-linked glycosylation site.
- the site for a mutation introducing a new N- or O-linked glycosylation site may be located anywhere in the polypeptide.
- Exemplary amino acid sequences for human growth hormone mutants are depicted in SEQ ID NOs:3-9.
- a "mutant human growth hormone" of this invention thus comprises at least one mutated amino acid residue.
- the wild-type human growth hormone whose coding sequence is modified to generate a mutant human growth hormone is referred to in this application as "the corresponding wild-type human growth hormone.”
- SEQ ID NO:l is the amino acid sequence of the corresponding wild-type human growth hormone for mutant human growth hormones having the amino acid sequences of SEQ ID NOs:3-9.
- the term "effective amount,” as used herein, refers to an amount that produces therapeutic effects for which a substance is administered.
- the effects include the prevention, correction, or inhibition of progression of the symptoms of a disease/condition and related complications to any detectable extent.
- the exact amount will depend on the purpose of the ttea ⁇ m ⁇ nt, a ⁇ d «- iii"i'e' asfe a a'b "by one skilled in the art using known techniques (see, e.g., Lieberman, Pharmaceutical Dosage Forms (vols. 1-3, 1992); Lloyd, The Art, Science and Technology of Pharmaceutical Compounding (1999); and Pickar, Dosage Calculations (1999)).
- modified sugar refers to a naturally- or non-naturally- occurring carbohydrate that is enzymatically added onto an amino acid or a glycosyl residue of a peptide in a process of the invention.
- the modified sugar is selected from a number of enzyme substrates including, but not limited to sugar nucleotides (mono-, di-, and tri- phosphates), activated sugars (e.g., glycosyl halides, glycosyl mesylates) and sugars that are neither activated nor nucleotides.
- the "modified sugar” is covalently fiinctionalized with a "modifying group.”
- modifying groups include, but are not limited to, water-soluble polymers, therapeutic moieties, diagnostic moieties, biomolecules and the like.
- the modifying group is preferably not a naturally occurring, or an unmodified carbohydrate.
- the locus of functionalization with the modifying group is selected such that it does not prevent the "modified sugar” from being added enzymatically to a peptide.
- water-soluble refers to moieties that have some detectable degree of solubility in water. Methods to detect and/or quantify water solubility are well known in the art.
- Exemplary water-soluble polymers include peptides, saccharides, poly(ethers), poly(amines), poly(carboxylic acids) and the like. Peptides can have mixed sequences of be composed of a single amino acid, e.g., poly(lysine).
- An exemplary polysaccharide is poly(sialic acid).
- An exemplary poly(ether) is poly(ethylene glycol), e.g., m-PEG.
- Poly(ethylene imine) is an exemplary polyamine
- poly(acrylic) acid is a representative poly(carboxylic acid).
- the polymer backbone of the water-soluble polymer can be poly(ethylene glycol) (i.e. PEG).
- PEG poly(ethylene glycol)
- other related polymers are also suitable for use in the practice of this invention and that the use of the term PEG or poly(ethylene glycol) is intended to be inclusive and not exclusive in this respect.
- PEG includes poly(ethylene glycol) in any of its forms, including alkoxy PEG, difunctional PEG, multiarmed PEG, forked PEG, branched PEG, pendent PEG (i.e. PEG or related polymers having one or more functional groups pendent to the polymer backbone), or PEG with degradable linkages therein.
- ⁇ ynlef bacr ⁇ hiPc n be linear or branched.
- Branched polymer backbones are generally known in the art.
- a branched polymer has a central branch core moiety and a plurality of linear polymer chains linked to the central branch core.
- PEG is commonly used in branched forms that can be prepared by addition of ethylene oxide to various polyols, such as glycerol, pentaerythritol and sorbitol.
- the central branch moiety can also be derived from several amino acids, such as lysine.
- the branched poly(ethylene glycol) can be represented in general form as R(-PEG-OH).sub.m in which R represents the core moiety, such as glycerol or pentaerythritol, and m represents the number of arms.
- R represents the core moiety, such as glycerol or pentaerythritol
- m represents the number of arms.
- Multi-armed PEG molecules such as those described in U.S. Pat. No. 5,932,462, which is incorporated by reference herein in its entirety, can also be used as the polymer backbone.
- polymers are also suitable for the invention.
- suitable polymers include, but are not limited to, other poly(alkylene glycols), such as poly(propylene glycol) ("PPG"), copolymers of ethylene glycol and propylene glycol and the like, poly(oxyethylated polyol), poly(olefmic alcohol), poly(vinylpyrrolidone), poly(hydroxypropylmethacrylamide), poly( ⁇ -hydroxy acid), poly(vinyl alcohol), polyphosphazene, polyoxazoline, poly(N-acryloylmorpholine), such as described in U.S.
- PPG poly(propylene glycol)
- copolymers of ethylene glycol and propylene glycol and the like poly(oxyethylated polyol), poly(olefmic alcohol), poly(vinylpyrrolidone), poly(hydroxy
- the "area under the curve” or "AUC”, as used herein in the context of administering a peptide drug to a patient, is defined as total area under the curve that describes the concentration of drug in systemic circulation in the patient as a function of time from zero to infinity.
- half-life or "Wi" in the context of administering a peptide drug to a patient, is defined as the time required for plasma concentration of a drug in a patient to be reduced by one half. There may be more than one half-life associated with the peptide drug depending on multiple clearance mechanisms, redistribution, and other mechanisms well known in the art. Usually, alpha and beta half-lives are defined such that the alpha phase is associated with redistribution, and the beta phase is associated with clearance. However, with protein drugs that are, for the most part, confined to the bloodstream! th*e "dan be- at'l ⁇ aS ⁇ two clearance half-lives.
- rapid beta phase clearance may be mediated via receptors on macrophages, or endothelial cells that recognize terminal galactose, N-acetylgalactosamine, N-acetylglucosamine, mannose, or fucose.
- Slower beta phase clearance may occur via renal glomerular filtration for molecules with an effective radius ⁇ 2 nm (approximately 68 kD) and/or specific or nonspecific uptake and metabolism in tissues.
- GlycoPEGylation may cap terminal sugars (e.g., galactose or N-acetylgalactosamine) and thereby block rapid alpha phase clearance via receptors that recognize these sugars.
- glycoconjugation refers to the enzymatically mediated conjugation of a modified sugar species to an amino acid or glycosyl residue of a polypeptide, e.g., a mutant human growth hormone of the present invention.
- a subgenus of "glycoconjugation” is "glycol-PEGylation,” in which the modifying group of the modified sugar is poly(ethylene glycol), and alkyl derivative (e.g., m-PEG) or reactive derivative (e.g., H2N-PEG, HOOC-PEG) thereof.
- glycosyl linking group refers to a glycosyl residue to which a modifying group (e.g., PEG moiety, therapeutic moiety, biomolecule) is covalently attached; the glycosyl linking group joins the modifying group to the remainder of the conjugate.
- the "glycosyl linking group” becomes covalently attached to a glycosylated or unglycosylated peptide, thereby linking the agent to an amino acid and/or glycosyl residue on the peptide.
- a “glycosyl linking group” is generally derived from a "modified sugar” by the enzymatic attachment of the "modified sugar” to an amino acid and/or glycosyl residue of the peptide.
- the glycosyl linking group can be a saccharide- derived structure that is degraded during formation of modifying group-modified sugar d ⁇ assette or the glycosyl linking group may be intact.
- an “intact glycosyl linking group” refers to a linking group that is derived from a glycosyl moiety in which the saccharide monomer that links the modifying group and to the remainder of the conjugate is not degraded, e.g., oxidized, e.g., by sodium metaperiodate.
- “Intact glycosyl linking groups” of the invention may be derived from a naturally occurring oligosaccharide by addition of glycosyl unit(s) or removal of one or more glycosyl unit from a parent saccharide structure.
- targeting moiety refers to species that will selectively localize in a particular tissue or region of the body. The localization is mediated by specific recognition of molecular determinants, molecular size of the targeting agent or conjugate, ionic interactions, hydrophobic interactions and the like. Other mechanisms of targeting an agent to a particular tissue or region are known to those of skill in the art.
- exemplary targeting moieties include antibodies, antibody fragments, transferrin, HS-glycoprotein, coagulation factors, serum proteins, ⁇ -glycoprotein, G-CSF, GM-CSF, M-CSF, EPO and the like.
- therapeutic moiety means any agent useful for therapy including, but not limited to, antibiotics, anti-inflammatory agents, anti-tumor drugs, cytotoxins, and radioactive agents.
- therapeutic moiety includes prodrugs of bioactive agents, constructs in which more than one therapeutic moiety is bound to a carrier, e.g, multivalent agents.
- Therapeutic moiety also includes proteins and constructs that include proteins.
- Exemplary proteins include, but are not limited to, Erythropoietin (EPO), Granulocyte Colony Stimulating Factor (GCSF), Granulocyte Macrophage Colony Stimulating Factor (GMCSF), Interferon (e.g., Interferon- ⁇ , - ⁇ , - ⁇ ), Interleukin (e.g., Interleukin II), serum proteins (e.g., Factors Nil, Vila, VIII, IX, and X), Human Chorionic Gonadotropin (HCG), Follicle Stimulating Hormone (FSH) and Lutenizing Hormone (LH) and antibody fusion proteins (e.g. Tumor Necrosis Factor Receptor ((TNFR)/Fc domain fusion protein)).
- EPO Erythropoietin
- GCSF Granulocyte Colony Stimulating Factor
- GMCSF Granulocyte Macrophage Colony Stimulating Factor
- Interferon
- anti-tumor drug means any agent useful to combat cancer including, but not limited to, cytotoxins and agents such as antimetabolites, alkylating agents, anthracyclines, antibiotics, antimitotic agents, procarbazine, hydroxyurea, asparaginase, corticosteroids, interferons and radioactive agents. Also encompassed within the scope of the term “anti-tumor drug,” are conjugates of peptides with anti-rumor activity, e.g. TNF- ⁇ .
- Conjugates include, but are not limited to those formed between a therapeutic protein and a gtyeoproteitf of h l e ' hveffl , ⁇ 3iri ! ; ' "-A' l rdpresentative conjugate is that formed between PSGL-1 and TNF- ⁇ .
- a cytotoxin or cytotoxic agent means any agent that is detrimental to cells. Examples include taxol, cytochalasin B, gramicidin D, ethidium bromide, emetine, mitomycin, etoposide, tenoposide, vincristine, vinblastine, colchicin, doxorubicin, daunorubicin, dihydroxy anthracinedione, mitoxantrone, mithramycin, actinomycin D, 1- dehydrotestosterone, glucocorticoids, procaine, tetracaine, lidocaine, propranolol, and puromycin and analogs or homologs thereof.
- Other toxins include, for example, ricin, CC- 1065 and analogues, the duocarmycins. Still other toxins include diptheria toxin, and snake venom (e.g. , cobra venom).
- a radioactive agent includes any radioisotope that is effective in diagnosing or destroying a tumor. Examples include, but are not limited to, indium- 111, cobalt-60. Additionally, naturally occurring radioactive elements such as uranium, radium, and thorium, which typically represent mixtures of radioisotopes, are suitable examples of a radioactive agent. The metal ions are typically chelated with an organic chelating moiety.
- ⁇ utically acceptable carrier includes any material, which when combined with the conjugate retains the conjugates' activity and is non-reactive with the subject's immune systems.
- Examples include, but are not limited to, any of the standard pharmaceutical carriers such as a phosphate buffered saline solution, water, emulsions such as oil/water emulsion, and various types of wetting agents.
- Other carriers may also include sterile solutions, tablets including coated tablets and capsules.
- Such carriers contain excipients such as starch, milk, sugar, certain types of clay, gelatin, stearic acid or salts thereof, magnesium or calcium stearate, talc, vegetable fats or oils, gums, glycols, or other known excipients.
- Such carriers may also include flavor and color additives or other ingredients. Compositions comprising such carriers are formulated by well known conventional methods.
- administering means oral administration, inhalation, administration as a suppository, topical contact, intravenous, intraperitoneal, intramuscular, intralesional, intranasal or subcutaneous administration, or the implantation of a slow-release device e.g. , a mini-osmotic pump, to the subject.
- Adminsitration is by any route including parenteral, and transmucosal (e.g., oral, nasal, vaginal, rectal, or transdermal).
- Parenteral administration includes, e.g., intravenous, intramuscular, intra-arteriole, intradermal, subcutaneous, intraperitoneal, intraventricular, and intracranial.
- injection is to treat a tumor, e.g., induce apoptosis
- administration may be directly to the tumor and/or into tissues surrounding the tumor.
- Other modes of delivery include, but are not limited to, the use of liposomal formulations, intravenous infusion, transdermal patches, etc.
- isolated refers to a material that is substantially or essentially free from components, which are used to produce the material.
- isolated refers to material that is substantially or essentially free from components, which normally accompany the material in the mixture used to prepare the peptide conjugate.
- isolated and pure are used interchangeably.
- isolated peptide conjugates of the invention have a level of purity preferably expressed as a range. The lower end of the range of purity for the peptide conjugates is about 60%, about 70%> or about 80% and the upper end of the range of purity is about 70%, about 80%, about 90%> or more than about 90%.
- the peptide conjugates are more than about 90% pure, their purities are also preferably expressed as a range.
- the lower end of the range of purity is about 90%, about 92%), about 94%, about 96% or about 98%.
- the upper end of the range of purity is about 92%, about 94%, about 96%, about 98% or about 100% purity.
- [WW2] pMfl Waet ⁇ rmir ⁇ e'd-b i'My art-recognized method of analysis (e.g., band intensity on a silver stained gel, polyacrylamide gel electrophoresis, HPLC, or a similar means).
- each member of the population describes a characteristic of a population of peptide conjugates of the invention in which a selected percentage of the modified sugars added to a peptide are added to multiple, identical acceptor sites on the peptide.
- "Essentially each member of the population” speaks to the "homogeneity" of the sites on the peptide conjugated to a modified sugar and refers to conjugates of the invention, which are at least about 80%, preferably at least about 90% and more preferably at least about 95% homogenous.
- homogeneity refers to the structural consistency across a population of acceptor moieties to which the modified sugars are conjugated.
- the peptide conjugate in which each modified sugar moiety is conjugated to an acceptor site having the same structure as the acceptor site to which every other modified sugar is conjugated, the peptide conjugate is said to be about 100% homogeneous.
- Homogeneity is typically expressed as a range. The lower end of the range of homogeneity for the peptide conjugates is about 60%, about 70%> or about 80% and the upper end of the range of purity is about 70%, about 80%), about 90% or more than about 90%.
- the peptide conjugates are more than or equal to about 90% homogeneous, their homogeneity is also preferably expressed as a range.
- the lower end of the range of homogeneity is about 90%>, about 92%, about 94%, about 96%> or about 98%>.
- the upper end of the range of purity is about 92%, about 94%, about 96%, about 98% or about 100% homogeneity.
- the purity of the peptide conjugates is typically determined by one or more methods known to those of skill in the art, e.g., liquid chromatography-mass spectrometry (LC-MS), matrix assisted laser desorption mass time of flight spectrometry (MALDITOF), capillary electrophoresis, and the like.
- substantially uniform glycoform or a “substantially uniform glycosylation pattern,” when referring to a glycopeptide species, refers to the percentage of acceptor moieties that are glycosylated by the glycosyltransferase of interest (e.g., fucosyltransferase). For example, in the case of a ⁇ 1,2 fucosyltransferase, a substantially uniform fucosylation pattern exists if substantially all (as defined below) of the Gal ⁇ l,4-GlcNAc-R and sialylated analogues thereof are fucosylated in a peptide conjugate of the invention.
- the starting material may contain glycosylated a'ccfeptbf moietie ' (e.g. ,”f ucosylated ' Gal ⁇ 1 ,4-GlcNAc-R moieties).
- the calculated percent glycosylation will include acceptor moieties that are glycosylated by the methods of the invention, as well as those acceptor moieties already glycosylated in the starting material.
- substantially in the above definitions of "substantially uniform” generally means at least about 40%), at least about 70%), at least about 80%), or more preferably at least about 90%>, and still more preferably at least about 95% of the acceptor moieties for a particular glycosyltransferase are glycosylated.
- PEG poly(ethyleneglycol); m-PEG, methoxy- ⁇ oly(ethylene glycol); PPG, poly(propyleneglycol); m-PPG, methoxy-poly(propylene glycol); Fuc, fucosyl; Gal, galactosyl; GalNAc, N-acetylgalactosaminyl; Glc, glucosyl; GlcNAc, N-acetylglucosaminyl; Man, mannosyl; ManAc, mannosaminyl acetate; Sia, sialic acid; and NeuAc, N- acetylneuraminy 1.
- the present invention provides genetically engineered mutants of human growth hormone that contain N-linked or O-linked glycosylation sites not present in naturally occurring human growth hormone. While these hGH mutants substantially retain the biological activity of the wild-type hormone, the newly introduced glycosylation sites allow the recombinantly produced hGH mutants to be glycosylated in a large variety of patterns. Moreover, the non-natural glycosylation sites provide loci for conjugating modifying groups to the peptide, e.g., by glycoconjugation.
- An exemplary modifying group is a water-soluble polymer, such as poly(ethylene glycol), e.g., methoxy-poly(ethylene glycol). Modification of the hGH mutants can improve the stability and retention time of the recombinant hGH in a patient's circulation, reduce their antigenicity, and enhance their ability to target a specific tissue in need of treatment.
- poly(ethylene glycol) e.g., methoxy-poly(ethylene glycol).
- the present invention provides mutants of hGH that include one or more O- or N- linked glycosylation sites that are not found in the wild type peptide.
- the mutants are su ' b'strates l r , 'etizy ' at ⁇ e' li g , l , elosy ! lMon at one or more sites that would not normally be glycosylated, or would be poorly glycosylated, in the wild type peptide.
- the mutants allow the position of a glycosyl residue or a glycosyl linking group to be engineered to obtain a peptide having selected desirable properties.
- the present invention provides an isolated nucleic acid comprising a polynucleotide sequence encoding a mutant human growth hormone.
- the mutant human growth hormone comprises an N-linked or O-linked glycosylation site that does not exist in the corresponding wild-type human growth hormone.
- the corresponding wild-type human growth hormone has the amino acid sequence of SEQ ID NO:l or SEQ ID NO:2.
- the mutant human growth hormone comprises the amino acid sequence of SEQ ID NO:3, 4, 5, 6, 7, 8, or 9.
- the present invention provides an expression cassette or a cell that comprises a nucleic acid, e.g., an isolated nucleic acid, including a polynucleotide sequence encoding a mutant human growth hormone.
- the mutant human growth hormone includes an N-linked or O-linked glycosylation site that does not exist in the corresponding wild-type human growth hormone.
- the present invention provides a mutant human growth hormone, that includes an N-linked or O-linked glycosylation site that does not exist in the corresponding wild-type human growth hormone.
- the corresponding wild-type human growth hormone has the amino acid sequence of SEQ ID NO: 1 or SEQ ID NO:2.
- the mutant human growth hormone comprises the amino acid sequence of SEQ ID NO:3, 4, 5, 6, 7, 8, or 9.
- the present invention provides a method for making a mutant human growth hormone that includes an N-linked or O-linked glycosylation site that does not exist in the corresponding wild-type human growth hormone.
- This method comprises the steps of recombinantly producing the mutant human growth hormone, and glycosylating the mutant human growth hormone at the new glycosylation site.
- the cUrfesp ' ta ⁇ dMg''W ⁇ 'i type l! h ⁇ a ⁇ :: gf ⁇ ' wth hormone has the amino acid sequence of SEQ ID NO: 1 or SEQ ID NO:2.
- the mutant human growth hormone comprises the amino acid sequence of SEQ ID NO:3, 4, 5, 6, 7, 8, or 9.
- This invention relies on routine techniques in the field of recombinant genetics. Basic texts disclosing the general methods of use in this invention include Sambrook and Russell, Molecular Cloning, A Laboratory Manual (3rd ed. 2001); Kriegler, Crene Transfer and Expression: A Laboratory Manual (1990); and Ausubel et al, eds., Current Protocols in Molecular Biology ( 1994).
- nucleic acids sizes are given in either kilobases (kb) or base pairs (bp). These are estimates derived from agarose or acrylamide gel electrophoresis, from sequenced nucleic acids, or from published DNA sequences.
- kb kilobases
- bp base pairs
- proteins sizes are given in kilodaltons (kDa) or amino acid residue numbers. Proteins sizes are estimated from gel electrophoresis, from sequenced proteins, from derived amino acid sequences, or from published protein sequences.
- Oligonucleotides that are not commercially available can be chemically synthesized, e.g., according to the solid phase phosphoramidite triester method first described by Beaucage & Caruthers, Tetrahedron Lett. 22: 1859-1862 (1981), using an automated synthesizer, as described in Van Devanter et. al, Nucleic Acids Res. 12: 6159-6168 (1984). Purification of oligonucleotides is performed using any art-recognized strategy, e.g. , native acrylamide gel electrophoresis or anion-exchange HPLC as described in Pearson & Reanier, J. Chrom. 255: 137-149 (1983).
- a number of polynucleotide sequences encoding a wild-type human growth hormone e.g., GenBank Accession Nos. NM 000515, NM 002059, NM 022556, NM 022557, NM 022558, NM 022559, NM 022560, NM 022561, and NM 022562, have been determined and can be obtained from a commercial supplier.
- a human DNA sequence database can be searched for any gene segment that has a certain percentage of sequence homology to a known nucleotide sequence, such as one encoding a previously identified human growth hormone. Any DNA sequence so identified can be subsequently obtained by chemical synthesis and/or a polymerase chain reaction (PCR) technique such as overlap extension method. For a short sequence, completely de novo synthesis may be sufficient; whereas further isolation of full length coding sequence from a human cDNA or genomic library using a synthetic probe may be necessary to obtain a larger gene.
- PCR polymerase chain reaction
- a nucleic acid sequence encoding a human growth hormone can be isolated from a human cDNA or genomic DNA library using standard cloning techniques such as polymerase chain reaction (PCR), where homology-based primers can often be derived from a known nucleic acid sequence encoding a human growth hormone.
- PCR polymerase chain reaction
- cDNA libraries suitable for obtaining a coding sequence for a wild-type human growth hormone may be commercially available or can be constructed.
- the general methods of isolating mRNA, making cDNA by reverse transcription, ligating cDNA into a recombinant vector, transfecting into a recombinant host for propagation, screening, and cloning are well known (see, e.g., Gubler and Hoffman, Gene, 25: 263-269 (1983); Ausubel et al, supra).
- the segment Upon obtaining an amplified segment of nucleotide sequence by PCR, the segment can be further used as a probe to isolate the full length polynucleotide sequence encoding the wild-type human growth hormone from the cDNA library.
- a general description of appropriate procedures can be found in Sambrook and Russell, supra.
- a similar procedure can be followed to obtain a full length sequence encoding a wild-type human growth hormone, e.g., any one of the GenBank Accession Nos. mentioned above, from a human genomic library.
- Human genomic libraries are commercially available or can be constructed according to various art-recognized methods. In general, to construct a genomic library, the DNA is first extracted from an tissue where a human growth hormone is likely found.
- the DNA is then either mechanically sheared or enzymatically digested to yield fragments of about 12-20 kb in length.
- the fragments are subsequently separated by gradient centrifugation from polynucleotide fragments of undesired sizes and are inserted in bacteriophage ⁇ vectors.
- These vectors and phages are packaged in vitro. Recombinant phages are atialyzed' l by"plaqUe hybridization as described in Benton and Davis, Science, 196: 180-182 (1977). Colony hybridization is carried out as described by Grunstein et al, Proc. Natl. Acad. Sci. USA, 72: 3961-3965 (1975).
- degenerate oligonucleotides can be designed as primer sets and PCR can be performed under suitable conditions (see, e.g., White et al, PCR Protocols: Current Methods and Applications, 1993; Griffin and Griffin, PCR Technology, CRC Press Inc. 1994) to amplify a segment of nucleotide sequence from a cDNA or genomic library. Using the amplified segment as a probe, the full length nucleic acid encoding a wild- type human growth hormone is obtained.
- the coding sequence can be subcloned into a vector, for instance, an expression vector, so that a recombinant wild-type human growth hormone can be produced from the resulting construct. Further modifications to the wild-type human growth hormone coding sequence, e.g., nucleotide substitutions, may be subsequently made to alter the characteristics of the molecule.
- amino acid sequence of a wild-type human growth hormone e.g., SEQ ID NO:l or SEQ ID NO:2
- this amino acid sequence may be modified to alter the protein's glycosylation pattern, by introducing additional glycosylation site(s) at various locations in the amino acid sequence.
- N-linked glycosylation occurs on the asparagine of the consensus sequence Asn-X aa -Ser/Thr, in which X aa is any amino acid except proline (Kornfeld et al., Ann Rev Biochem 54:631-664 (1985); Kukuruzinska et al, Proc. Natl. Acad. Sci. USA 84:2145-2149 (1987); Herscovics et al, FASEB J 7:540-550 (1993); and Orlean, Saccharomyces Vol. 3 (1996)).
- O-linked glycosylation takes place at serine or threonine residues (Tanner et al, Biochim. Biophys. Ada. 906:81-91 (1987); and Hounsell et al, Glycoconj. J. 13:19-26 (1996)).
- Other glycosylation patterns are formed by linking glycosylphosphatidylinositol to the carboxyl-terminal carboxyl group of the protein (Takeda et al, Trends Biochem. Sci.
- kits for mutagenesis, library construction, and other diversity-generating methods are commercially available.
- Mutational methods of generating diversity include, for example, site-directed mutagenesis (Botstein and Shortle, Science, 229: 1193-1201 (1985)), mutagenesis using uracil-containing templates (Kunkel, Proc. Natl. Acad. Sci. USA, 82: 488-492 (1985)), oligonucleotide-directed mutagenesis (Zoller and Smith, Nucl. Acids Res., 10: 6487-6500 (1982)), phosphorothioate-modified DNA mutagenesis (Taylor et al, Nucl.
- the polynucleotide sequence encoding a mutant human growth hormone can be further altered to coincide with the preferred codon usage of a particular host.
- the preferred codon usage of one strain of bacterial cells can be used to derive a polynucleotide that encodes a mutant human growth hormone of the invention and includes the codons favored by this strain.
- the frequency of preferred codon usage exhibited by a host cell can be calculated by averaging frequency of preferred codon usage in a large number of genes expressed by the host cell (e.g., calculation service is available from web site of the Kazusa DNA Research Institute, Japan). This analysis is preferably limited to genes that are highly expressed by the host cell.
- U.S. Patent No. 5,824,864 for example, provides the frequency of codon usage by highly expressed genes exhibited by dicotyledonous plants and monocotyledonous plants.
- mutant human growth hormone coding sequences are verified by sequencing and are then subcloned into an appropriate expression vector for recombinant production in the same manner as the wild-type human growth hormones.
- mutant human growth hormone of the present invention can be produced using routine techniques in the field of recombinant genetics, relying on the polynucleotide sequences encoding the polypeptide disclosed herein.
- a nucleic acid encoding a mutant human growth hormone of the present invention one typically subclones a polynucleotide encoding the mutant human growth hormone into an expression vector that contains a strong promoter to direct transcription, a transcription translation terminator and a ribosome binding site for translational initiation.
- Suitable bacterial promoters are well known in the art and described, e.g., in Sambrook and Russell, supra, and Ausubel et al, supra.
- Bacterial expression systems for expressing the wild-type or mutant human growth hormone are available in, e.g., E. coli, Bacillus sp., Salmonella, and Caulobader. Kits for such expression systems are commercially available.
- Eukaryotic expression systems for mammalian cells, yeast, and insect cells are well known in the art and are also commercially available.
- one eukaryotic i 'ex fe'ssion vector is an adenoviral vector, an adeno-associated vector, or a retroviral vector.
- the promoter used to direct expression of a heterologous nucleic acid depends on the particular application.
- the promoter is optionally positioned about the same distance from the heterologous transcription start site as it is from the transcription start site in its natural setting. As is known in the art, however, some variation in this distance can be accommodated without loss of promoter function.
- the expression vector typically includes a transcription unit or expression cassette that contains all the additional elements required for the expression of the mutant human growth hormone in host cells.
- a typical expression cassette thus contains a promoter operably linked to the nucleic acid sequence encoding the mutant human growth hormone and signals required for efficient polyadenylation of the transcript, ribosome binding sites, and translation termination.
- the nucleic acid sequence encoding the human growth hormone is typically linked to a cleavable signal peptide sequence to promote secretion of the human growth hormone by the transformed cell.
- signal peptides include, among others, the signal peptides from tissue plasminogen activator, insulin, and neuron growth factor, and juvenile hormone esterase of Heliothis virescens.
- Additional elements of the cassette may include enhancers and, if genomic DNA is used as the structural gene, introns with functional splice donor and acceptor sites.
- the expression cassette should also contain a transcription termination region downstream of the structural gene to provide for efficient termination. The termination region may be obtained from the same gene as the promoter sequence or may be obtained from different genes.
- the particular expression vector used to transport the genetic information into the cell is not particularly critical. Any of the conventional vectors used for expression in eukaryotic or prokaryotic cells may be used. Standard bacterial expression vectors include plasmids such as pBR322 based plasmids, pSKF, pET23D, and fusion expression systems such as GST and LacZ. Epitope tags can also be added to recombinant proteins to provide convenient methods of isolation, e.g., c-myc.
- Expression vectors containing regulatory elements from eukaryotic viruses are typically used in eukaryotic expression vectors, e.g., SV40 vectors, papilloma virus vectors, and vectors derived from Epstein-Barr virus.
- exemplary eukaryotic vectors include jpMSO, ⁇ AVtKWA" ,- ' pMTO 0/A7 ' pMAMneo-5, baculovirus pDSVE, and any other vector allowing expression of proteins under the direction of the SV40 early promoter, SV40 later promoter, • metallothionein promoter, murine mammary tumor virus promoter, Rous sarcoma virus promoter, polyhedrin promoter, or other promoters shown effective for expression in eukaryotic cells.
- Some expression systems have markers that provide gene amplification such as thymidine kinase, hygromycin B phosphotransferase, and dihydrofolate reductase.
- markers that provide gene amplification such as thymidine kinase, hygromycin B phosphotransferase, and dihydrofolate reductase.
- high yield expression systems not involving gene amplification are also suitable, such as a baculovirus vector in insect cells, with a polynucleotide sequence encoding the mutant human growth hormone under the direction of the polyhedrin promoter or other strong baculovirus promoters.
- the elements that are typically included in expression vectors also include a replicon that functions in E. coli, a gene encoding antibiotic resistance to permit selection of bacteria that harbor recombinant plasmids, and unique restriction sites in nonessential regions of the plasmid to allow insertion of eukaryotic sequences.
- the particular antibiotic resistance gene chosen is not critical, any of the many resistance genes known in the art are suitable.
- the prokaryotic sequences are optionally chosen such that they do not interfere with the replication of the DNA in eukaryotic cells, if necessary. Similar to antibiotic resistance selection markers, metabolic selection markers based on known metabolic pathways may also be used as a means for selecting transformed host cells.
- the expression vector further comprises a sequence encoding a secretion signal, such as the E. coli OppA (Periplasmic Oligopeptide Binding Protein) secretion signal or a modified version thereof, which is directly connected to 5' of the coding sequence of the protein to be expressed.
- a secretion signal such as the E. coli OppA (Periplasmic Oligopeptide Binding Protein) secretion signal or a modified version thereof, which is directly connected to 5' of the coding sequence of the protein to be expressed.
- This signal sequence directs the recombinant protein produced in cytoplasm through the cell membrane into the periplasmic space.
- the expression vector may further comprise a coding sequence for signal peptidase 1, which is capable of enzymatically cleaving the signal sequence when the recombinant protein is entering the periplasmic space. More detailed description for periplasmic production of a recombinant protein can be found in, e.g. , Gray et al. , Gene 39: 247-254 (1985), U.S. Patent Nos. 6,160,089 and 6,436,674.
- Standard transfection methods are used to produce bacterial, mammalian, yeast, insect, or plant cell lines that express large quantities of the mutant human growth hormone, which are then purified using standard techniques (see, e.g., Colley et al, J. Biol. Chem. 264: 17619-17622 (1989); Guide to Protein Purification, in Methods in Enzymology, vol. 182 (Deutscher, ed., 1990)). Transformation of eukaiyotic and prokaryotic cells are performed according to standard techniques (see, e.g., Morrison, J, Bad.
- Any of the well known procedures for introducing foreign nucleotide sequences into host cells may be used. These include the use of calcium phosphate transfection, polybrene, protoplast fusion, electroporation, liposomes, microinjection, plasma vectors, viral vectors and any of the other well known methods for introducing cloned genomic DNA, cDNA, synthetic DNA, or other foreign genetic material into a host cell (see, e.g., Sambrook and Russell, supra). It is only necessary that the particular genetic engineering procedure used be capable of successfully introducing at least one gene into the host cell capable of expressing the mutant human growth hormone.
- the transfected cells are cultured under conditions favoring expression of the mutant human growth hormone.
- the cells are then screened for the expression of the recombinant polypeptide, which is subsequently recovered from the culture using standard techniques (see, e.g., Scopes, Protein Purification: Principles and Practice (1982); U.S. Patent No. 4,673,641; Ausubel et al, supra; and Sambrook and Russell, supra).
- standard techniques see, e.g., Scopes, Protein Purification: Principles and Practice (1982); U.S. Patent No. 4,673,641; Ausubel et al, supra; and Sambrook and Russell, supra.
- gene expression can be detected at the polypeptide level.
- Various immunological assays are routinely used by those skilled in the art to measure the level of a gene product, particularly using polyclonal or monoclonal antibodies that react specifically with a mutant human growth hormone of the present invention, such as a polypeptide having the amino acid sequence of SEQ ID NO:3, 4, or 5, (e.g., Harlow and Lane, Antibodies, A Laboratory Manual, Chapter 14, Cold Spring Harbor, 1988; Kohler and Milstein, Nature, 256: 495-497 (1975)).
- Such techniques require antibody preparation by selecting antibodies with high specificity against the mutant human growth hormone or an antigenic portion thereof.
- the mutant human growth hormones of the present invention are produced recombinantly by transformed bacteria in large amounts, typically after promoter induction, although expression can be constitutive, the proteins may form insoluble aggregates.
- purification of protein inclusion bodies typically involves the extraction, separation and/or purification of inclusion bodies by disruption of bacterial cells, e.g., by incubation in a buffer of about 100-150 ⁇ g/ml lysozyme and"0.'l% N ⁇ ide't 40,'"a' ribh-i ⁇ hie detergent.
- the cell suspension can be ground using a Polytron grinder (Brinkman Instruments, Westbury, NY). Alternatively, the cells can be sonicated on ice. Alternate methods of lysing bacteria are described in Ausubel et al. and Sambrook and Russell, both supra, and will be apparent to those of skill in the art. [0123]
- the cell suspension is generally centrifuged and the pellet containing the inclusion bodies resuspended in buffer which does not dissolve but washes the inclusion bodies, e.g., 20 mM Tris-HCl (pH 7.2), 1 mM EDTA, 150 mM NaCl and 2% Triton-X 100, a non-ionic detergent.
- pellet of inclusion bodies may be resuspended in an appropriate buffer (e.g., 20 mM sodium phosphate, pH 6.8, 150 mM NaCl).
- an appropriate buffer e.g., 20 mM sodium phosphate, pH 6.8, 150 mM NaCl.
- Other appropriate buffers will be apparent to those of skill in the art.
- the inclusion bodies are solubilized by the addition of a solvent that is both a strong hydrogen acceptor and a strong hydrogen donor (or a combination of solvents each having one of these properties).
- a solvent that is both a strong hydrogen acceptor and a strong hydrogen donor or a combination of solvents each having one of these properties.
- the proteins that formed the inclusion bodies may then be renatured by dilution or dialysis with a compatible buffer.
- Suitable solvents include, but are not limited to, urea (from about 4 M to about 8 M), formamide (at least about 80%>, volume/volume basis), and guanidine hydrochloride (from about 4 M to about 8 M).
- Some solvents that are capable of solubilizing aggregate-forming proteins may be inappropriate for use in this procedure due to the possibility of irreversible denaturation of the proteins, accompanied by a lack of immunogenicity and/or activity.
- SDS sodium dodecyl sulfate
- 70% formic acid may be inappropriate for use in this procedure due to the possibility of irreversible denaturation of the proteins, accompanied by a lack of immunogenicity and/or activity.
- guanidine hydrochloride and similar agents are denaturants, this denaturation is not irreversible and renaturation may occur upon removal (by dialysis, for example) or dilution of the denaturant, allowing re-formation of the immunologically and/or biologically active protein of interest.
- the protein can be separated from other bacterial proteins by standard separation techniques.
- purifying recombinant human growth hormone from bacterial inclusion body see, e.g., Patra et al, Protein Expression and Purification 18: 182-190 (2000).
- recombinant polypeptides e.g., a mutant human growth hormone
- the periplasmic fraction of the bacteria can be isolated by cold osmotic shock in addition to other methods known to those of skill in the art (see e.g., Ausubel et al, supra).
- the eW ⁇ al ' ceils-'are' c'eritrif ⁇ f e :, tb li f ⁇ rm a pellet. The pellet is resuspended in a buffer containing 20%) sucrose.
- the bacteria are centrifuged and the pellet is resuspended in ice-cold 5 mM MgSO 4 and kept in an ice bath for approximately 10 minutes.
- the cell suspension is centrifuged and the supernatant decanted and saved.
- the recombinant proteins present in the supernatant can be separated from the host proteins by standard separation techniques well known to those of skill in the art.
- a recombinant polypeptide e.g., the mutant human growth hormone ofthe present invention
- its purification can follow the standard protein purification procedure described below.
- an initial salt fractionation can separate many ofthe unwanted host cell proteins (or proteins derived from the cell culture media) from the recombinant protein of interest, e.g., a mutant human growth hormone ofthe present invention.
- the preferred salt is ammonium sulfate. Ammonium sulfate precipitates proteins by effectively reducing the amount of water in the protein mixture. Proteins then precipitate on the basis of their solubility. The more hydrophobic a protein is, the more likely it is to precipitate at lower ammonium sulfate concentrations.
- a typical protocol is to add saturated ammonium sulfate to a protein solution so that the resultant ammonium sulfate concentration is between 20-30%). This will precipitate the most hydrophobic proteins. The precipitate is discarded (unless the protein of interest is hydrophobic) and ammonium sulfate is added to the supernatant to a concentration known to precipitate the protein of interest. The precipitate is then solubilized in buffer and the excess salt removed if necessary, through either dialysis or diafiltration. Other methods that rely on solubility of proteins, such as cold ethanol precipitation, are well known to those of skill in the art and can be used to fractionate complex protein mixtures.
- a protein of greater and lesser size can be isolated using ultrafiltration through membranes of different pore sizes (for example, Amicon or Millipore membranes).
- the protein mixture is ultrafiltered through a membrane with a pore size that has a lower molecular weight cut-off than the molecular weight of a protein of interest, e.g., a mutant human growth hormone.
- the recombinant protein will pass through the membrane into the filtrate.
- the filtrate can then be chromatographed as described below.
- the proteins of interest can also be separated from other proteins on the basis of their size, net surface charge, hydrophobicity, or affinity for ligands.
- antibodies raised against human growth hormone can be conjugated to column matrices and the human growth hormone immunopurified. All of these methods are well known in the art.
- chromatographic techniques can be performed at any scale and using equipment from many different manufacturers (e.g., Pharmacia Biotech).
- immunological assays may be useful to detect in a sample the expression ofthe polypeptide. Immunological assays are also useful for quantifying the expression level ofthe recombinant hormone. Antibodies against a mutant human growth hormone are necessary for carrying out these immunological assays.
- Such techniques include antibody preparation by selection of antibodies from libraries of recombinant antibodies in phage or similar vectors (see, Huse et al., Science 246: 1275-1281, 1989; and Ward et al, Nature 341: 544-546, 1989).
- the polypeptide of interest e.g., a mutant human growth hormone ofthe present invention
- an aSitrgemc 1 ffagr n't thtrebf 6a'n b ⁇ sed to immunize suitable animals, e.g., mice, rabbits, or primates.
- a standard adjuvant such as Freund's adjuvant, can be used in accordance with a standard immunization protocol.
- a synthetic antigenic peptide derived from that particular polypeptide can be conjugated to a carrier protein and subsequently used as an immunogen.
- the animal's immune response to the immunogen preparation is monitored by taking test bleeds and determining the titer of reactivity to the antigen of interest.
- blood is collected from the animal and antisera are prepared. Further fractionation ofthe antisera to enrich antibodies specifically reactive to the antigen and purification ofthe antibodies can be performed subsequently, see, Harlow and Lane, supra, and the general descriptions of protein purification provided above.
- Monoclonal antibodies are obtained using various techniques familiar to those of skill in the art.
- spleen cells from an animal immunized with a desired antigen are immortalized, commonly by fusion with a myeloma cell (see, Kohler and Milstein, Eur. J. Immunol. 6:511-519, 1976).
- Alternative methods of immortalization include, e.g., transformation with Epstein Barr Virus, oncogenes, or retroviruses, or other methods well known in the art.
- Colonies arising from single immortalized cells are screened for production of antibodies ofthe desired specificity and affinity for the antigen, and the yield ofthe monoclonal antibodies produced by such cells may be enhanced by various techniques, including injection into the peritoneal cavity of a vertebrate host.
- monoclonal antibodies may also be recombinantly produced upon identification of nucleic acid sequences encoding an antibody with desired specificity or a binding fragment of such antibody by screening a human B cell cDNA library according to the general protocol outlined by Huse et al, supra.
- the general principles and methods of recombinant polypeptide production discussed above are applicable for antibody production by recombinant methods.
- antibodies capable of specifically recognizing a mutant human growth hormone ofthe present invention can be tested for their cross-reactivity against the wild- type human growth hormone and thus distinguished from the antibodies against the wild-type protein.
- antisera obtained from an animal immunized with a mutant human growth hormone can be run through a column on which a wild-type human growth ⁇ rmO ⁇ e'is'i' ⁇ tirh'bbilized " he-pbttion ofthe antisera that passes through the column recognizes only the mutant human growth hormone and not the wild-type human growth hormone.
- monoclonal antibodies against a mutant human growth hormone can also be screened for their exclusivity in recognizing only the mutant but not the wild-type human growth hormone.
- Polyclonal or monoclonal antibodies that specifically recognize only the mutant human growth hormone ofthe present invention but not the wild-type human growth hormone are useful for isolating the mutant protein from the wild-type protein, for example, by incubating a sample with a mutant human growth hormone-specific polyclonal or monoclonal antibody immobilized on a solid support.
- the amount ofthe polypeptide in a sample can be measured by a variety of immunoassay methods providing qualitative and quantitative results to a skilled artisan.
- immunoassay methods providing qualitative and quantitative results to a skilled artisan.
- Immunoassays often utilize a labeling agent to specifically bind to and label the binding complex formed by the antibody and the target protein.
- the labeling agent may itself be one ofthe moieties comprising the antibody/target protein complex, or may be a third moiety, such as another antibody, that specifically binds to the antibody/target protein complex.
- a label may be detectable by spectroscopic, photochemical, biochemical, immunochemical, electrical, optical or chemical means.
- Examples include, but are not limited to, magnetic beads (e.g., DynabeadsTM), fluorescent dyes (e.g., fluorescein isothiocyanate, Texas red, rhodamine, and the like), radiolabels (e.g., 3 H, I25 1, 35 S, 14 C, or
- enzymes e.g., horse radish peroxidase, alkaline phosphatase, and others commonly used in an ELISA
- colorimetric labels such as colloidal gold or colored glass or plastic (e.g., polystyrene, polypropylene, latex, etc.) beads.
- the labeling agent is a second antibody bearing a detectable label.
- the second antibody may lack a label, but it may, in turn, be bound by a labeled third antibody specific to antibodies ofthe species from which the second antibody is def ⁇ vfed.” ' I'he-S eb ⁇ 'i ritibO ' y ii ⁇ drii'rJi' modified with a detectable moiety, such as biotin, to which a third labeled molecule can specifically bind, such as enzyme-labeled streptavidin.
- proteins capable of specifically binding immunoglobulin constant regions can also be used as the label agents. These proteins are normal constituents ofthe cell walls of streptococcal bacteria. They exhibit a strong non- immunogenic reactivity with immunoglobulin constant regions from a variety of species (see, generally, Kronval, et al. J. Immunol, 111: 1401-1406 (1973); and Akerstrom, et al., J. Immunol, 135: 2589-2542 (1985)).
- Immunoassays for detecting a target protein of interest may be either competitive or noncompetitive.
- Noncompetitive immunoassays are assays in which the amount of captured target protein is directly measured.
- the antibody specific for the target protein can be bound directly to a solid substrate where the antibody is immobilized. It then captures the target protein in test samples.
- the antibody/target protein complex thus immobilized is then bound by a labeling agent, such as a second or third antibody bearing a label, as described above.
- the amount of target protein in a sample is measured indirectly by measuring the amount of an added (exogenous) target protein displaced (or competed away) from an antibody specific for the target protein by the target protein present in the sample.
- the antibody is immobilized and the exogenous target protein is labeled. Since the amount ofthe exogenous target protein bound to the antibody is inversely proportional to the concentration ofthe target protein present in the sample, the target protein level in the sample can thus be determined based on the amount of exogenous target protein bound to the antibody and thus immobilized.
- western blot analysis is used to detect and quantify the presence of a mutant human growth hormone in the samples.
- the technique generally comprises separating sample proteins by gel electrophoresis on the basis of molecular weight, transferring the separated proteins to a suitable solid support (such as a nitrocellulose filter, a nylon filter, or a derivatized nylon filter) and incubating the samples with the antibodies that specifically bind the target protein.
- antibodies may be directly labeled or alternatively niia »b is ⁇ t ⁇ e ⁇ !iMtl .detfe *I"USirif 'labeled antibodies (e.g., labeled sheep anti-mouse antibodies) that specifically bind to the antibodies against a mutant human growth hormone.
- LOA liposome immunoassays
- the invention provides methods for preparing conjugates of glycosylated and unglycosylated mutant human growth hormones, which have new glycosylation sites that do not exist in the corresponding wild-type hGH. Such conjugation may take place directly on the appropriate sugar units of a glycosylated mutant hGH, or following the removal (i.e., "trimming back") of any undesired sugar units.
- the conjugates are formed between peptides and diverse species such as water-soluble polymers, therapeutic moieties, diagnostic moieties, targeting moieties and the like.
- conjugates that include two or more peptides linked together through a linker arm i.e., multifunctional conjugates.
- the multi-functional conjugates ofthe invention can include two or more copies ofthe same peptide or a collection of diverse peptides with different structures, and/or properties.
- the conjugates of the invention are formed by the enzymatic attachment of a modified sugar to the glycosylated or unglycosylated peptide.
- the modified sugar when interposed between the peptide and the modifying group on the sugar becomes what is referred to herein as "an intact glycosyl linking group.”
- an intact glycosyl linking group Using the extraordinarivity of eruzyrneS Sufe ⁇ a's'f- iybbs iltfariSfeia ⁇ e-s, the present method provides peptides that bear a desired group at one or more specific locations.
- a modified sugar is attached directly to a selected locus on the peptide chain or, alternatively, the modified sugar is appended onto a carbohydrate moiety of a glycopeptide.
- Peptides in which modified sugars are bound to both a glycopeptide carbohydrate and directly to an amino acid residue ofthe peptide backbone are also within the scope ofthe present invention.
- the methods ofthe invention make it possible to assemble peptides and glycopeptides that have a substantially homogeneous derivatization pattern; the enzymes used in the invention are generally selective for a particular amino acid residue or combination of amino acid residues ofthe peptide.
- the methods are also practical for large-scale production of modified peptides and glycopeptides.
- the methods ofthe invention provide a practical means for large- scale preparation of glycopeptides having preselected uniform derivatization patterns.
- the methods are particularly well suited for modification of therapeutic peptides, including but not limited to, glycopeptides that are incompletely glycosylated during production in cell culture cells (e.g., mammalian cells, insect cells, plant cells, fungal cells, yeast cells, or prokaryotic cells) or transgenic plants or animals.
- cell culture cells e.g., mammalian cells, insect cells, plant cells, fungal cells, yeast cells, or prokaryotic cells
- transgenic plants or animals e.g., transgenic plants or animals.
- the methods ofthe invention also provide conjugates of glycosylated and unglycosylated peptides with increased therapeutic half-life due to, for example, reduced clearance rate, or reduced rate of uptake by the immune or reticuloendothelial system (RES). Moreover, the methods ofthe invention provide a means for masking antigenic determinants on peptides, thus reducing or eliminating a host immune response against the peptide. Selective attachment of targeting agents can also be used to target a peptide to a particular tissue or cell surface receptor that is specific for the particular targeting agent.
- RES reticuloendothelial system
- the present invention provides a conjugate between a selected modifying group and an hGH mutant peptide having a glycosylation site not present in the wild type peptide.
- the modifying group may be attached at the mutant glycosylation site or at a site that is present in the wild type peptide.
- the link between the peptide and the modifying includes a glycosyl linking group interposed between the peptide and the selected moiety.
- the selected moiety is essentially any species that can be attached to a saccharide unit, resulting in a ⁇ modified M r 8Jtt tti!at s%e b 6grii 'by an appropriate transferase enzyme, which appends the modified sugar onto the peptide.
- the saccharide component ofthe modified sugar when interposed between the peptide and a selected moiety, becomes a "glycosyl linking group," e.g., an "intact glycosyl linking group.”
- the glycosyl linking group is formed from any mono- or oligo-saccharide that, after modification with the modifying group, is a substrate for an enzyme that adds the modified sugar to an amino acid or glycosyl residue of a peptide.
- the glycosyl linking group can be, or can include, a saccharide moiety that is degradatively modified during the addition ofthe modifying group.
- the glycosyl linking group can be derived from a saccharide residue that is produced by oxidative degradation of an intact saccharide to the corresponding aldehyde, e.g., via the action of metaperiodate, and subsequently converted to a Schiff base with an appropriate amine, which is then reduced to the corresponding amine.
- the "agent” is a therapeutic agent, a bioactive agent, a detectable label, water-soluble moiety (e.g., PEG, m-PEG, PPG, and m-PPG) or the like.
- the "agent” can be a peptide, e.g., enzyme, antibody, antigen, etc.
- the linker can be any of a wide array of linking groups, infra.
- the linker may be a single bond or a "zero order linker.”
- the selected modifying group is a water-soluble polymer, e.g., m-PEG.
- the water-soluble polymer is covalently attached to the peptide via a glycosyl linking group.
- the glycosyl linking group is covalently attached to an amino acid residue or a glycosyl residue ofthe peptide.
- the invention also provides conjugates in which an amino acid residue and a glycosyl residue are modified with a glycosyl linking group.
- An exemplary water-soluble polymer is poly(ethylene glycol), e.g., methoxy- poly(ethylene glycol).
- the poly(ethylene glycol) used in the present invention is not restricted to any particular form or molecular weight range.
- the poly(ethylene glycol) molecular weight is preferably between 500 and 100,000.
- a molecular weight of 500-60,000 is preferably used and preferably of from 1,000-40,000. More preferably, the molecular weight is from about 5,000 to about 40,000.
- each poly(ethylene glycol) ofthe branched PEG is 5,000-20,000.
- the present invention provides conjugates that are highly homogenous in their substitution patterns. Using the methods ofthe invention, it is possible to form peptide conjugates in which essentially all ofthe modified sugar moieties across a population of conjugates ofthe invention are attached to multiple copies of a structurally identical amino acid or glycosyl residue.
- the invention provides a peptide conjugate having a population of water-soluble polymer moieties, which are covalently bound to the peptide through an intact glycosyl linking group.
- each member ofthe population is bound via the glycosyl linking group to a glycosyl residue ofthe peptide, and each glycosyl residue ofthe peptide to which the glycosyl linking group is attached has the same structure.
- a peptide conjugate having a population of water-soluble polymer moieties covalently bound thereto through a glycosyl linking group.
- a glycosyl linking group essentially every member ofthe population of water soluble polymer moieties is bound to an amino acid residue ofthe peptide via a glycosyl linking group, and each amino acid residue having a glycosyl linking group attached thereto has the same structure.
- the present invention also provides conjugates analogous to those described above in which the peptide is conjugated to a therapeutic moiety, diagnostic moiety, targeting moiety, toxin moiety or the like via an intact glycosyl linking group.
- the peptide is conjugated to a therapeutic moiety, diagnostic moiety, targeting moiety, toxin moiety or the like via an intact glycosyl linking group.
- Each ofthe above- recited moieties can be a small molecule, natural polymer (e.g., polypeptide) or synthetic polymer.
- mutant human growth hormone is conjugated to transferrin via a bifunctional linker that includes an intact glycosyl linking group at each terminus ofthe PEG moiety (Scheme 1).
- a bifunctional linker that includes an intact glycosyl linking group at each terminus ofthe PEG moiety (Scheme 1).
- one terminus ofthe PEG linker is fun'bti nalized' i wi l tl ll a ⁇ linker that is attached to transferrin and the other is fiinctionalized with an intact GalNAc linker that is attached to the mutant hGH.
- the conjugates ofthe invention can include intact glycosyl linking groups that are mono- or multi-valent (e.g., antennary structures).
- conjugates ofthe invention include both species in which a selected moiety is attached to a peptide via a monovalent glycosyl linking group.
- conjugates in which more than one selected moiety is attached to a peptide via a multivalent linking group are also included within the invention.
- the invention provides conjugates that localize selectively in a particular tissue due to the presence of a targeting agent as a component ofthe conjugate.
- the targeting agent is a protein.
- Exemplary proteins include transferrin (brain, blood pool), HS-glycoprotein (bone, brain, blood pool), antibodies (brain, tissue with antibody-specific antigen, blood pool), coagulation factors V- XII (damaged tissue, clots, cancer, blood pool), serum proteins, e.g., ⁇ -acid glycoprotein, fetuin, ⁇ -fetal protein (brain, blood pool), ⁇ 2-glycoprotein (liver, atherosclerosis plaques, brain, blood pool), G-CSF, GM-CSF, M-CSF, and EPO (immune stimulation, cancers, blood pool, red blood cell overproduction, neuroprotection), albumin (increase in half-life), and lipoprotein E.
- the present invention provides methods for preparing these and other conjugates.
- the invention provides a method of forming a covalent conjugate between a selected moiety and a peptide.
- the invention provides methods for targeting conjugates ofthe invention to a particular tissue or region ofthe body.
- the present invention provides a method for preventing, curing, or ameliorating a disease state by administering a conjugate ofthe invention to a subject at risk of developing the disease or a subject that has the disease.
- the conjugate is formed between a water-soluble polymer, a therapeutic moiety, targeting moiety or a biomolecule, and a glycosylated or non- glycosylated peptide.
- the polymer, therapeutic moiety or biomolecule is conjugated to the peptide via an intact glycosyl linking group, which is interposed between, and covalently linked to both the peptide and the modifying group (e.g., water-soluble polymer).
- the method includes contacting the peptide with a mixture containing a modified sugar and a glycosyltransferase for which the modified sugar is a substrate.
- the reaction is conducted u'hc ⁇ er covalent bond between the modified sugar and the peptide.
- the sugar moiety ofthe modified sugar is preferably selected from nucleotide sugars, activated sugars, and sugars that are neither nucleotides nor activated.
- the acceptor peptide (glycosylated or non-glycosylated) is typically synthesized de novo, or recombinantly expressed in a prokaryotic cell (e.g., bacterial cell, such as E. coli) or in a eukaryotic cell such as a mammalian, yeast, insect, fungal or plant cell.
- a prokaryotic cell e.g., bacterial cell, such as E. coli
- a eukaryotic cell such as a mammalian, yeast, insect, fungal or plant cell.
- the peptide can be either a full-length protein or a fragment.
- the peptide can be a wild type or mutated peptide.
- the peptide includes a mutation that adds one or more consensus glycosylation sites to the peptide sequence.
- the method of the invention also provides for modification of incompletely glycosylated peptides that are produced recombinantly. Many recombinantly produced glycoproteins are incompletely glycosylated, exposing carbohydrate residues that may have undesirable properties, e.g., immunogenicity, recognition by the RES.
- the peptide can be simultaneously further glycosylated and derivatized with, e.g., a water-soluble polymer, therapeutic agent, or the like.
- the sugar moiety ofthe modified sugar can be the residue that would properly be conjugated to the acceptor in a fully glycosylated peptide, or another sugar moiety with desirable properties.
- Peptides modified by the methods ofthe invention can be synthetic or wild-type peptides or they can be mutated peptides, produced by methods known in the art, such as site- directed mutagenesis. Glycosylation of peptides is typically either N-linked or O-linked. An exemplary N-linkage is the attachment ofthe modified sugar to the side chain of an asparagine residue.
- the tripeptide sequences asparagine-X-serine and asparagine-X- threonine, where X is any amino acid except proline, are the recognition sequences for enzymatic attachment of a carbohydrate moiety to the asparagine side chain.
- O-linked glycosylation refers to the attachment of one sugar (e.g., N- aceylgalactosamine, galactose, mannose, GlcNAc, glucose, fucose or xylose) to a the hydroxy side chain of a hydroxyamino acid, preferably serine or threonine, although 5- hydroxyproline or 5-hydroxylysine may also be used.
- one sugar e.g., N- aceylgalactosamine, galactose, mannose, GlcNAc, glucose, fucose or xylose
- Addition of glycosylation sites to a peptide or other structure is conveniently accomplished by altering the amino acid sequence such that it contains one or more glycosylation sites.
- the addition may also be made by the incorporation of one or more s 6 ⁇ es ll pfes ' dht ⁇ h l g 'i ari' ::L OH '''
- the addition may be made by mutation or by full chemical synthesis ofthe peptide.
- the peptide amino acid sequence is preferably altered through changes at the DNA level, particularly by mutating the DNA encoding the peptide at preselected bases such that codons are generated that will translate into the desired amino acids.
- the DNA mutation(s) are preferably made using methods known in the art.
- the glycosylation site is added by shuffling polynucleotides.
- Polynucleotides encoding a candidate peptide can be modulated with DNA shuffling protocols.
- DNA shuffling is a process of recursive recombination and mutation, performed by random fragmentation of a pool of related genes, followed by reassembly of the fragments by a polymerase chain reaction-like process. See, e.g., Stemmer, Proc. Natl. Acad. Sci. USA 91:10747-10751 (1994); Stemmer, Nature 370:389-391 (1994); and U.S. Patent ⁇ os. 5,605,793, 5,837,458, 5,830,721 and 5,811,238.
- the present invention also provides means of adding (or removing) one or more selected glycosyl residues to a peptide, after which a modified sugar is conjugated to at least one ofthe selected glycosyl residues ofthe peptide.
- the present embodiment is useful, for example, when it is desired to conjugate the modified sugar to a selected glycosyl residue that is either not present on a peptide or is not present in a desired amount.
- the selected glycosyl residue prior to coupling a modified sugar to a peptide, the selected glycosyl residue is conjugated to the peptide by enzymatic or chemical coupling.
- the glycosylation pattern of a glycopeptide is altered prior to the conjugation ofthe modified sugar by the removal of a carbohydrate residue from the glycopeptide. See, for example WO 98/31826.
- Enzymatic cleavage of carbohydrate moieties on polypeptide variants can be achieved by the use of a variety of endo- and exo-glycosidases as described by Thotakura et al, Meth. Enzymol 138: 350 (1987). [0l ⁇ 4] !1 • ' , Ch niiMr ' fd ' ditlol l'' b ' f ; g 'c'osyl moieties is carried out by any art-recognized method.
- Enzymatic addition of sugar moieties is preferably achieved using a modification ofthe methods set forth herein, substituting native glycosyl units for the modified sugars used in the invention. Other methods of adding sugar moieties are disclosed in U.S. Patent Nos. 5,876,980, 6,030,815, 5,728,554, and 5,922,577.
- Exemplary attachment points for selected glycosyl residue include, but are not limited to: (a) consensus sites for N-linked glycosylation and O-linked glycosylation; (b) terminal glycosyl moieties that are acceptors for a glycosyltransferase; (c) arginine, asparagine and histidine; (d) free carboxyl groups; (e) free sulfhydryl groups such as those of cysteine; (f) free hydroxyl groups such as those of serine, threonine, or hydroxyproline; (g) aromatic residues such as those of phenylalanine, tyrosine, or tryptophan; or (h) the amide group of glutamine.
- the invention provides a method for linking hGH and one or more peptide through a linking group.
- the linking group is of any useful structure and may be selected from straight-chain and branched chain structures.
- each terminus of the linker, which is attached to a peptide includes a modified sugar (i.e., a nascent intact glycosyl linking group).
- two peptides are linked together via a linker moiety that includes a PEG linker.
- a PEG moiety is functionalized at a first terminus with a first glycosyl unit and at a second terminus with a second glycosyl unit.
- the first and second glycosyl units are preferably substrates for different transferases, allowing orthogonal attachment ofthe first and second peptides to the first and second glycosylunits, respectively.
- the (glycosyl) '-PEG-(glycosyl) 2 linker is contacted with the first peptide and a first transferase for which the first glycosyl unit is a substrate, thereby forming (peptide)'-(glycosyl) 1 -PEG-(glycosyl) 2 .
- Glycosyltransferase and/or unreacted peptide is then optionally rernoWd frbnAhe react ⁇ B mixture.
- the second peptide and a second transferase for which the second glycosyl unit is a substrate are added to the (peptide)'-(glycosyl) I -PEG-(glycosyl) 2 conjugate, forming
- human growth hormone is conjugated to transferrin via a bifunctional linker that includes an intact glycosyl linking group at each terminus ofthe PEG moiety (Scheme 1).
- the hGH conjugate has an in vivo half-life that is increased over that of hGH alone by virtue ofthe greater molecular sized ofthe conjugate.
- the conjugation of hGH to transferrin serves to selectively target the conjugate to the brain.
- one terminus ofthe PEG linker is functionalized with a CMP sialic acid and the other is functionalized with an UDP GalNAc.
- the linker is combined with hGH in the presence of a GalNAc transferase, resulting in the attachment ofthe GalNAc ofthe linker arm to a serine and/or threonine residue on the hGH.
- the reactions functionalizing the intact glycosyl linking groups at the termini ofthe PEG (or other) linker with the peptide can occur simultaneously in the same reaction vessel, or they can be carried out in a step-wise fashion.
- the conjugate produced at each step is optionally purified from one or more reaction components (e.g., enzymes, peptides).
- reaction components e.g., enzymes, peptides.
- G is a glycosyl residue on an activated sugar moiety (e.g., sugar nucleotide), which is converted to an intact glycosyl linker group in the conjugate.
- L is a saccharyl linking group such as GalNAc, or GalNAc-Gal.
- the invention provides a method for extending the blood-circulation half-life of a selected peptide, in essence targeting the peptide to the blood pool, by conjugating the peptide to a synthetic or natural polymer of a size sufficient to retard the filtration ofthe protein by the glomerulus (e.g., albumin).
- a synthetic or natural polymer of a size sufficient to retard the filtration ofthe protein by the glomerulus e.g., albumin.
- This embodiment ofthe invention is illustrated in Scheme 3 in which hGH is conjugated to albumin via a PEG linker using a combination of chemical and enzymatic modification.
- a residue (e.g., amino acid side chain) of albumin is modified with a reactive PEG derivative, such as X-PEG-(CMP-sialic acid), in which X is an activating group (e.g., active ester, isothiocyanate, etc).
- X is an activating group (e.g., active ester, isothiocyanate, etc).
- the PEG derivative and hGH are combined and contacted with a transferase for which CMP-sialic acid is a substrate.
- an ⁇ -amine of lysine is reacted with the N- hydroxysuccinimide ester ofthe PEG-linker to form the albumin conjugate.
- the CMP-silaic acid ofthe linker is enzymatically conjugated to an appropriate residue on hGH, e.g., Gal or GalNAc, thereby forming the conjugate.
- hGH e.g., Gal or GalNAc
- the above- described method is not limited to the reaction partners set forth.
- the method can be practiced to form conjugates that include more than two protein moieties by, for example, utilizing a branched linker having more than two termini. Toirfi ' S ars-
- Modified glycosyl donor species are preferably selected from modified sugar nucleotides, activated modified sugars and modified sugars that are simple saccharides that are neither nucleotides nor activated. Any desired carbohydrate structure can be added to a peptide using the methods ofthe invention. Typically, the structure will be a monosaccharide, but the present invention is not limited to the use of modified monosaccharide sugars; oligosaccharides and polysaccharides are useful as well.
- the modifying group is attached to a sugar moiety by enzymatic means, chemical means or a combination thereof, thereby producing a modified sugar.
- the sugars are substituted at any position that allows for the attachment ofthe modifying moiety, yet which still allows the sugar to function as a substrate for the enzyme used to ligate the modified sugar to the peptide.
- sialic acid when sialic acid is the sugar, the sialic acid is substituted with the modifying group at either the 9-position on the pyruvyl side chain or at the 5-position on the- amine moiety that is normally acetylated in sialic acid.
- a modified sugar nucleotide is utilized to add the modified sugar to the peptide.
- exemplary sugar nucleotides that are used in the present invention in their modified form include nucleotide mono-, di- or triphosphates or analogs thereof.
- the modified sugar nucleotide is selected from a UDP-glycoside, CMP-glycoside, or a GDP-glycoside.
- the modified sugar nucleotide is selected from an UDP-galactose, UDP-galactosamine, UDP- glucose, UDP-glucosamine, GDP-mannose, GDP-fucose, CMP-sialic acid, or CMP-NeuAc.
- N-acetylamine derivatives ofthe sugar nucletides are also of use in the method ofthe invention.
- the invention also provides methods for synthesizing a modified peptide using a modified sugar, e.g., modified-galactose, -fucose, -GalNAc, and -sialic acid.
- a modified sugar e.g., modified-galactose, -fucose, -GalNAc, and -sialic acid.
- a modified sialic acid either a sialyltransferase or a trans-sialidase (for ⁇ 2,3 -linked sialic acid only) can be used in these methods.
- the modified sugar is an activated sugar.
- Activated modified sugars which are useful in the present invention are typically glycosides which have been synthetically altered to include an activated leaving group.
- activated leaving group refers to those moieties, which are easily displaced in enzyme- regulated nucleophilic substitution reactions. Many activated sugars are known in the art. Sfeer ⁇ br BIOLOGY, Vol. 2, Ernst et al. Ed., Wiley- VCH Verlag: Weinheim, Germany, 2000; Kodama et al, Tetrahedron Lett. 34: 6419 (1993); Lougheed, et al, J. Biol. Chem. 274: 37717 (1999)).
- activating groups include fluoro, chloro, bromo, tosylate ester, mesylate ester, triflate ester and the like.
- Preferred activated leaving groups, for use in the present invention are those that do not significantly sterically encumber the enzymatic transfer ofthe glycoside to the acceptor. Accordingly, preferred embodiments of activated glycoside derivatives include glycosyl fluorides and glycosyl mesylates, with glycosyl fluorides being particularly preferred.
- glycosyl fluorides ⁇ -galactosyl fluoride, ⁇ -mannosyl fluoride, ⁇ -glucosyl fluoride, ⁇ -fucosyl fluoride, ⁇ -xylosyl fluoride, ⁇ - sialyl fluoride, ⁇ -N-acetylglucosaminyl fluoride, ⁇ -N-acetylgalactosaminyl fluoride, ⁇ - galactosyl fluoride, ⁇ -mannosyl fluoride, ⁇ -glucosyl fluoride, ⁇ -fucosyl fluoride, ⁇ -xylosyl fluoride, ⁇ -sialyl fluoride, ⁇ -N-acetylglucosaminyl fluoride and ⁇ -N-acetylgalactosaminyl fluoride are most preferred.
- glycosyl fluorides can be prepared from the free sugar by first acetylating the sugar and then treating it with HF/pyridine. This generates the thermodynamically most stable anomer ofthe protected (acetylated) glycosyl fluoride (z'.e., the ⁇ -glycosyl fluoride). If the less stable anomer (i.e., the ⁇ -glycosyl fluoride) is desired, it can be prepared by converting the peracetylated sugar with HBr/HOAc or with HCl to generate the anomeric bromide or chloride. This intermediate is reacted with a fluoride salt such as silver fluoride to generate the glycosyl fluoride.
- Acetylated glycosyl fluorides may be deprotected by reaction with mild (catalytic) base in methanol (e.g. NaOMe/MeOH). In addition, many glycosyl fluorides are commercially available.
- glycosyl mesylates can be prepared by treatment ofthe fully benzylated hemiacetal form ofthe sugar with mesyl chloride, followed by catalytic hydrogenation to remove the benzyl groups.
- the modified sugar is an oligosaccharide having an antennary structure.
- one or more ofthe termini ofthe antennae bear the modifying moiety.
- the oligosaccharide is useful to "amplify" the modifying moiety; each oligosaccharide unit conjugated to the peptide attaches multiple copies
- the general structure of a typical chelate ofthe invention as set forth in the drawing above encompasses multivalent species resulting from preparing a conjugate ofthe invention utilizing an antennary structure. Many antennary saccharide structures are known in the art, and the present method can be practiced with them without limitation.
- modifying groups are discussed below.
- the modifying groups can be selected for their ability to impart to a polypeptide one or more desirable properties.
- Exemplary properties include, but are not limited to, enhaced pharmacokinetics, enhanced pharmacodynamics, improved biodistribution, providing a polyvalent species, improved water solubility, enhanced or diminished lipophilicity, and tissue targeting.
- hydrophilicity of a selected peptide is enhanced by conjugation with polar molecules such as amine-, ester-, hydroxyl- and polyhydroxyl-containing molecules.
- polar molecules such as amine-, ester-, hydroxyl- and polyhydroxyl-containing molecules.
- Representative examples include, but are not limited to, polylysine, polyethyleneimine, and polyethers, e.g., poly(ethylene glycol), m-poly(ethylene glycol), poly(propyleneglycol), m- poly(propylene glycol), and other O-alkyl poly(alkylene glycol) moieties.
- Preferred water- soluble polymers are essentially non- fluorescent, or emit such a minimal amount of fluorescence that they are inappropriate for use as a fluorescent marker in an assay.
- polymers that are not naturally occurring sugars are not naturally occurring sugars.
- An exception to this preference is the use of an otherwise naturally occurring sugar that is modified by covalent attachment of another entity (e.g., poly(ethylene glycol), poly(propylene glycol), biomolecule, therapeutic moiety, diagnostic moiety, etc.).
- a therapeutic sugar moiety is conjugated to a linker arm and the sugar-linker arm cassette is subsequently conjugated to a peptide via a method ofthe invention.
- water-soluble polymer encompasses species such as saccharides (e.g., dextran, amylose, hyalouronic acid, poly(sialic acid), heparans, heparins, etc.); poly (amino acids); nucleic acids; synthetic polymers (e.g., poly(acrylic acid), poly(ethers), e.g., ⁇ oly(ethylene glycol); peptides, proteins, and the like.
- saccharides e.g., dextran, amylose, hyalouronic acid, poly(sialic acid), heparans, heparins, etc.
- poly (amino acids) nucleic acids
- synthetic polymers e.g., poly(acrylic acid), poly(ethers), e.g., ⁇ oly(ethylene glycol); peptides, proteins, and the like.
- the present invention may be practiced with any water-soluble polymer with the sole limitation that the polymer must include a point
- Preferred water-soluble polymers are those in which a substantial proportion ofthe polymer molecules in a sample ofthe polymer are of approximately the same molecular weight; such polymers are said to be “homodisperse” or “monodisperse.”
- the present invention is further illustrated by reference to a poly(ethylene glycol) or monomethoxy-poly(ethylene glycol) (m-PEG) conjugate.
- m-PEG monomethoxy-poly(ethylene glycol)
- the poly(ethylene glycol) useful in forming the conjugate ofthe invention is either linear or branched.
- the in vivo half- life or area under the curve (AUC) of therapeutic glycopeptides can also be enhanced with water-soluble polymers such as PEG, m-PEG, PPG, and m-PPG.
- water-soluble polymers such as PEG, m-PEG, PPG, and m-PPG.
- PEG PEG-ylation
- m-PEG m-PEG- ylation
- the in vivo half-life of a peptide derivatized with a water-soluble polymer by a method ofthe invention is increased relevant to the in vivo half-life or AUC ofthe non- derivatized peptide.
- the increase in peptide in vivo half-life or AUC is best expressed as a range of percent increase in this quantity.
- the lower end ofthe range of percent increase is about
- PEG moieties of any molecular weight e.g., 5 kD, 10 kD, 20 kD, and 30 kD, are of use in the present invention.
- the modified sugar bears a biomolecule.
- the biomolecule is a functional protein, enzyme, antigen, antibody, peptide, nucleic acid (e.g., single nucleotides or nucleosides, oligonucleotides, polynucleotides and single- and higher-stranded nucleic acids), lectin, receptor or a combination thereof.
- biomolecules are essentially non-fluorescent, or emit such a minimal amount of fluorescence that they are inappropriate for use as a fluorescent marker in an assay.
- biomolecules that are not sugars.
- An exception to this preference is the use of an otherwise naturally occurring sugar that is modified by covalent attachment of another entity (e.g., PEG, biomolecule, therapeutic moiety, diagnostic moiety, etc.).
- a sugar moiety, which is a biomolecule is arm cassette is subsequently conjugated to a peptide via a method ofthe invention.
- Biomolecules useful in practicing the present invention can be derived from any source.
- the biomolecules can be isolated from natural sources or they can be produced by synthetic methods.
- Peptides can be natural peptides or mutated peptides. Mutations can be effected by chemical mutagenesis, site-directed mutagenesis or other means of inducing mutations known to those of skill in the art.
- Peptides useful in practicing the instant invention include, for example, enzymes, antigens, antibodies and receptors.
- Antibodies can be either polyclonal or monoclonal; either intact or fragments.
- the peptides are optionally the products of a program of directed evolution.
- Both naturally derived and synthetic peptides and nucleic acids are of use in conjunction with the present invention; these molecules can be attached to a sugar residue component or a crosslinking agent by any available reactive group.
- peptides can be attached through a reactive amine, carboxyl, sulfhydryl, or hydroxyl group.
- the reactive group can reside at a peptide terminus or at a site internal to the peptide chain.
- Nucleic acids can be attached through a reactive group on a base (e.g., exocyclic amine) or an available hydroxyl group on a sugar moiety (e.g., 3'- or 5 '-hydroxyl).
- the peptide and nucleic acid chains can be further derivatized at one or more sites to allow for the attachment of appropriate reactive groups onto the chain. See, Chrisey et al. Nucleic Acids Res. 24: 3031-3039 (1996).
- the biomolecule is selected to direct the peptide modified by the methods ofthe invention to a specific tissue, thereby enhancing the delivery ofthe peptide to that tissue relative to the amount of underivatized peptide that is delivered to the tissue.
- the amount of derivatized peptide delivered to a specific tissue within a selected time period is enhanced by derivatization by at least about 20%, more preferably, at least about 40%, and more preferably still, at least about 100%.
- preferred biomolecules for targeting applications include antibodies, hormones and ligands for cell-surface receptors.
- conjugate with biotin there is provided as conjugate with biotin.
- a selectively biotinylated peptide is elaborated by the attachment of an avidin or streptavidin moiety bearing one or more modifying groups. ' e a ettt ⁇ 6'-M ⁇ et ⁇ &s"'
- the modified sugar includes a therapeutic moiety.
- a therapeutic moiety Those of skill in the art will appreciate that there is overlap between the category of therapeutic moieties and biomolecules; many biomolecules have therapeutic properties or potential.
- the therapeutic moieties can be agents already accepted for clinical use or they can be drugs whose use is experimental, or whose activity or mechanism of action is under investigation.
- the therapeutic moieties can have a proven action in a given disease state or can be only hypothesized to show desirable action in a given disease state.
- the therapeutic moieties are compounds, which are being screened for their ability to interact with a tissue of choice.
- Therapeutic moieties, which are useful in practicing the instant invention include drugs from a broad range of drug classes having a variety of pharmacological activities.
- Preferred therapeutic moieties are essentially non-fluorescent, or emit such a minimal amount of fluorescence that they are inappropriate for use as a fluorescent marker in an assay.
- therapeutic moieties that are not sugars.
- An exception to this preference is the use of a sugar that is modified by covalent attachment of another entity, such as a PEG, biomolecule, therapeutic moiety, diagnostic moiety and the like.
- a therapeutic sugar moiety is conjugated to a linker arm and the sugar-linker arm cassette is subsequently conjugated to a peptide via a method ofthe invention.
- the therapeutic moiety is attached to the modified sugar via a linkage that is cleaved under selected conditions.
- exemplary conditions include, but are not limited to, a selected pH (e.g., stomach, intestine, endocytotic vacuole), the presence of an active enzyme (e.g., esterase, reductase, oxidase), light, heat and the like.
- an active enzyme e.g., esterase, reductase, oxidase
- light heat and the like.
- heat and the like cleaveable groups are known in the art. See, for example, Jung et al, Biochem.
- Classes of useful therapeutic moieties include, for example, non-steroidal anti- inflammatory drugs (NSAIDS).
- NSAIDS non-steroidal anti- inflammatory drugs
- the NSAIDS can, for example, be selected from the following categories: (e.g., propionic acid derivatives, acetic acid derivatives, fenamic acid derivatives, biphenylcarboxylic acid derivatives and oxicams); steroidal anti-inflammatory drugs including hydrocortisone and the like; antihistaminic drugs (e.g., chlorpheniramine, triprolidine); antitussive drugs (e.g., dextromethorphan, codeine, caramiphen and carbetapentane); antipruritic drugs (e.g., methdilazine and trimeprazine); anticholinergic drugs (e.g., scopolamine, atropine, homatropine, levodopa); anti-emetic and antinauseant drugs (e.g., cycli
- vasodilator drugs e.g., diltiazem, amiodarone, isoxsuprine, nylidrin, tolazoline and verapamil
- vasoconstrictor drugs e.g., dihydroergotamine, ergotamine and methylsergide
- antiulcer drugs e.g., ranitidine and cimetidine
- anesthetic drugs e.g., lidocaine, bupivacaine, chloroprocaine, dibucaine
- antidepressant drugs e.g., imipramine, desipramine, amitryptiline, nortryptiline
- tranquilizer and sedative drugs e.g., chlordiazepoxide, benacytyzine, benzquinamide, flurazepam, hydroxyzine, loxapine and promazine
- antipsychotic drugs e.g., chlorprothixen
- Antimicrobial drugs which are preferred for incorporation into the present composition include, for example, pharmaceutically acceptable salts of ⁇ -lactam drugs, quinolone drugs, ciprofloxacin, norfloxacin, tetracycline, erythromycin, amikacin, triclosan, doxycycline, capreomycin, chlorhexidine, chlortetracycline, oxytetracycline, clindamycin, ethambutol, hexamidine isothionate, metronidazole, pentamidine, gentamycin, kanamycin, lineomycin, methacycline, methenamine, minocycline, neomycin, netilmycin, paromomycin, streptomycin, tobramycin, miconazole and amantadine.
- antineoplastic drugs e.g., antiandrogens (e.g., leuprolide or flutamide), cytocidal agents (e.g., adriamycin, doxorubicin, taxol, cyclophosphamide, busulfan, cisplatin, ⁇ -2-interferon) anti-estrogens (e.g., tamoxifen), antimetabolites (e.g., fluorouracil, methotrexate, mercaptopurine, thioguanine).
- antiandrogens e.g., leuprolide or flutamide
- cytocidal agents e.g., adriamycin, doxorubicin, taxol, cyclophosphamide, busulfan, cisplatin, ⁇ -2-interferon
- anti-estrogens e.g., tamoxifen
- antimetabolites e.g., fluor
- radioisotope-based agents for both diagnosis and therapy, and conjugated toxins, such as ricin, geldanamycin, mytansin, CC- 1065, the duocarmycins, Chlicheamycin and related structures and analogues thereof.
- the therapeutic moiety can also be a hormone (e.g., medroxyprogesterone, estradiol, leuprolide, megestrol, octreotide or somatostatin); muscle relaxant drugs (e.g., cinnamedrine, cyclobenzaprine, flavoxate, orphenadrine, papaverine, mebeverine, idaverine, ritodrine, diphenoxylate, dantrolene and azumolen); antispasmodic drugs; bone-active drugs (e.g., diphosphonate and phosphonoalkylphosphinate drug compounds); endocrine modulating drugs (e.g., contraceptives (e.g., ethinodiol, ethinyl estradiol, norethindrone, mestranol, desogestrel, medroxyprogesterone), modulators of diabetes (e.g., glycerin,
- estrogens e.g., diethylstilbesterol
- glucocorticoids e.g., triamcinolone, betamethasone, etc.
- progestogens such as norethindrone, ethynodiol, norethindrone, levonorgestrel
- thyroid agents e.g., liothyronine or levothyroxine
- anti-thyroid agents e.g., methimazole
- antihyperprolactinemic drugs e.g., cabergoline
- hormone suppressors e.g., danazol or goserelin
- oxytocics e.g., methylergonovine or oxytocin
- prostaglandins such as mioprostol, alprostadil or dinoprostone
- Other useful modifying groups include immunomodulating drugs (e.g., antihistamines, mast cell stabilizers, such as lodoxamide and/or cromolyn, steroids (e.g., triamcinolone, beclomethazone, cortisone, dexamethasone, prednisolone, methylprednisolone, beclomethasone, or clobetasol), histamine H2 antagonists (e.g., famotidine, cimetidine, ranitidine), immunosuppressants (e.g., azathioprine, cyclosporin), etc.
- immunomodulating drugs e.g., antihistamines, mast cell stabilizers, such as lodoxamide and/or cromolyn
- steroids e.g., triamcinolone, beclomethazone, cortisone, dexamethasone, prednisolone, methylprednisolone, beclomethasone, or clobe
- the sugar moiety and the modifying group are linked together through the use of reactive groups, which are typically transformed by the linking process into a new organic functional group or species that is unreactive under physiologically relevant conditions.
- the sugar reactive functional group(s) is located at any position on the sugar moiety.
- Reactive groups and classes of reactions useful in practicing the present invention are generally those that are well known in the art of bioconjugate chemistry. Currently favored classes of reactions available with reactive sugar moieties are those, which proceed under relatively mild conditions.
- nucleophilic substitutions e.g., reactions of amines and alcohols with acyl halides, active esters
- electrophilic substitutions e.g., enamine reactions
- additions to carbon-carbon and carbon-heteroatom multiple bonds e.g., Michael reaction, Diels- Alder addition.
- Useful reactive functional groups pendent from a sugar nucleus or modifying group include, but are not limited to: (a) carboxyl groups and various derivatives thereof including, but not limited to,
- N-hydroxysuccinimide esters N-hydroxybenztriazole esters, acid halides, acyl imidazoles, thioesters, p-nitrophenyl esters, alkyl, alkenyl, alkynyl and aromatic esters;
- hydroxyl groups which can be converted to, e.g., esters, ethers, aldehydes, etc.
- haloalkyl groups wherein the halide can be later displaced with a nucleophilic group such as, for example, an amine, a carboxylate anion, thiol anion, carbanion, or an alkoxide ion, thereby resulting in the covalent attachment of a new group at the functional group ofthe halogen atom;
- dienophile groups which are capable of participating in Diels- Alder reactions such as, for example, maleimido groups;
- amine or sulfhydryl groups which can be, for example, acylated, alkylated or oxidized;
- alkenes which can undergo, for example, cycloadditions, acylation, Michael addition, etc.
- the reactive functional groups can be chosen such that they do not participate in, or interfere with, the reactions necessary to assemble the reactive sugar nucleus or modifying group.
- a reactive functional group can be protected from participating in the reaction by the presence of a protecting group.
- protecting groups see, for example, Greene et al, PROTECTIVE GROUPS IN ORGANIC SYNTHESIS, John Wiley & Sons, New York, 1991.
- sialic acid derivative is utilized as the sugar nucleus to which the modifying group is attached.
- the focus ofthe discussion on sialic acid derivatives is for clarity of illustration only and should not be construed to limit the scope ofthe invention.
- Those of skill in the art will appreciate that a variety of other sugar moieties can be activated and derivatized in a manner analogous to that set forth using sialic acid as an example.
- the peptide that is modified by a method ofthe invention is a glycopeptide that is produced in prokaryotic cells (e.g., E.coli), eukaryotic cells lricludmg'yeast-an ⁇ t rhamfna'lilan-eeH's (e.g., CHO cells), or in a transgenic animal and thus, contains N- and/or O-linked oligosaccharide chains, which are incompletely sialylated.
- the oligosaccharide chains ofthe glycopeptide lacking a sialic acid and containing a terminal galactose residue can be PEG-ylated, PPG-ylated or otherwise modified with a modified sialic acid.
- Exemplary PEG-sialic acid derivative include:
- L is a substituted or unsubstituted alkyl or substituted or unsubstituted heteroalkyl linker moiety joining the sialic acid moiety and the PEG moiety, and "n" is 1 or greater;
- index "s" represents an integer from 0 to 20, and "n" is 1 or greater.
- the amino glycoside 1 is treated with the active ester of a protected amino acid (e.g., glycine) derivative, converting the sugar amine residue into the corresponding protected amino acid amide adduct.
- the adduct is treated with an aldolase to form ⁇ -hydroxy carboxylate 2.
- Compound 2 is converted to the corresponding CMP derivative by the action of CMP-SA synthetase, followed by catalytic hydrogenation ofthe CMP derivative to produce compound 3.
- the amine introduced via formation ofthe glycine adduct is utilized as a locus of PEG attachment by reacting compound 3 with an activated PEG or PPG derivative (e.g., PEG-C(O)NHS, PEG-OC(O)O-p-nitrophenyl), producing species such as 4 or 5, respectively.
- an activated PEG or PPG derivative e.g., PEG-C(O)NHS, PEG-OC(O)O-p-nitrophenyl
- Table 1 sets forth representative examples of sugar monophosphates that are derivatized with a PEG or PPG moiety.
- Human growth hormone mutants can be modified by the method of Scheme 1.
- Other derivatives are prepared by art-recognized methods. See, for example, Keppler et al, Glycobiology 11: 11R (2001); and Charter et al., Glycobiology 10: 1049 (2000)).
- Other amine reactive PEG and PPG analogues are commercially available, or they can be prepared by methods readily accessible to those of skill in the art.
- modified sugar phosphates of use in practicing the present invention can be substituted in other positions as well as those set forth above.
- Presently preferred substitutions of sialic acid are set forth in Formula I:
- X is a linking group, which is preferably selected from -O-, -N(H)-, -S, CH 2 -, and - N(R) 2 , in which each R is a member independently selected from R'-R 5 .
- the symbols Y, Z, A and B each represent a group that is selected from the group set forth above for the identity of X.
- X, Y, Z, A and B are each independently selected and, therefore, they can be the same or di ' fferdhf. K » , s ;
- R 4 and R 5 represent H, a water-soluble polymer, therapeutic moiety, biomolecule or other moiety.
- moieties attached to the conjugates disclosed herein include, but are not limited to, PEG derivatives (e.g., alkyl-PEG, acyl-PEG, acyl-alkyl-PEG, alkyl-acyl-PEG carbamoyl-PEG, aryl-PEG), PPG derivatives (e.g., alkyl-PPG, acyl-PPG, acyl-alkyl-PPG, alkyl-acyl-PPG carbamoyl-PPG, aryl-PPG), therapeutic moieties, diagnostic moieties, mannose-6-phosphate, heparin, heparan, SLe x , mannose, mannose-6-phosphate, Sialyl Lewis X, FGF, NFGF, proteins, chondroitin, keratan, dermatan, albumin
- Preparation ofthe modified sugar for use in the methods ofthe present invention includes attachment of a modifying group to a sugar residue and forming a stable adduct, which is a substrate for a glycosyltransferase.
- the sugar and modifying group can be coupled by a zero- or higher-order cross-linking agent.
- Exemplary bifunctional compounds which can be used for attaching modifying groups to carbohydrate moieties include, but are not limited to, bifunctional poly(ethyleneglycols), polyamides, polyethers, polyesters and the like. General approaches for linking carbohydrates to other molecules are known in the literature. See, for example, Lee et al, Biochemistry 28: 1856 (1989); Bhatia et al, Anal. Biochem.
- SPDP detrimentally affects the ability ofthe modified sugar to act as a glycosyltransferase substrate
- one of an array of other crosslinkers such as 2-iminothiolane or N-succinimidyl S-acetylthioacetate (SAT A) is used to form a disulfide bond.
- 2- iminothiolane reacts with primary amines, instantly incorporating an unprotected sulfhydryl onto the amine-containing molecule.
- SATA also reacts with primary amines, but incorporates a protected sulfhydryl, which is later deacetaylated using hydroxylamine to produce a free sulfhydryl. In each case, the incorporated sulfhydryl is free to react with other sulfhydryls or protected sulfhydryl, like SPDP, forming the required disulfide bond.
- TPCH(S-(2-thiopyridyl)-L- cysteine hydrazide and TPMPH (S-(2-thiopyridyl) mercapto-propionohydrazide) react with carbohydrate moieties that have been previously oxidized by mild periodate treatment, thus forming a hydrazone bond between the hydrazide portion ofthe crosslinker and the periodate generated aldehydes.
- TPCH and TPMPH introduce a 2-pyridylthione protected sulfhydryl group onto the sugar, which can be deprotected with DTT and then subsequently used for conjugation, such as forming disulfide bonds between components.
- crosslinkers may be used that incorporate more stable bonds between components.
- the heterobifunctional crosslinkers GMBS (N-gama-malimidobutyryloxy)succinim ' ide) and SMCC (succinimidyl 4-(N-maleimido-methyl)cyclohexane) react with primary amines, thus introducing a maleimide group onto the component.
- the maleimide group can subsequently react with sulfhydryls on the other component, which can be introduced by previously mentioned crosslinkers, thus forming a stable thioether bond between the components.
- crosslinkers can be used which introduce long spacer arms between components and include derivatives of some ofthe previously mentioned crosslinkers (i.e., SPDP).
- SPDP some ofthe previously mentioned crosslinkers
- a variety of reagents are used to modify the components ofthe modified sugar with intramolecular chemical crosslinks (for reviews of crosslinking reagents and crosslinking procedures see: Wold, F., Meth. Enzymol. 25: 623-651, 1972; Weetall, H. H., and Cooney, D. A., In: ENZYMES AS DRUGS. (Holcenberg, and Roberts, eds.) pp. 395-442, Wiley, New York, 1981; Ji, T. H., Meth. Enzymol. 91: 580-609, 1983; Mattson et al, Mol Biol. Rep. 17: 167- 183, 1993, all of which are incorporated herein by reference).
- Preferred crosslinking reagents are derived from various zero-length, homo-bifunctional, and hetero-bifunctional crosslinking reagents.
- Zero-length crosslinking reagents include direct conjugation of two intrinsic chemical groups with no introduction of extrinsic material. Agents that catalyze formation of a disulfide bond belong to this category.
- Another example is reagents that induce condensation of a carboxyl and a primary amino group to form an amide bond such as carbodiimides, ethylchloroformate, Woodward's reagent K (2-ethyl-5-phenylisoxazolium-3'- sulfonate), and carbonyldiimidazole.
- transglutaminase (glutamyl-peptide ⁇ -glutamyltransferase; EC 2.3.2.13) may be used as zero- length crosslinking reagent.
- This enzyme catalyzes acyl transfer reactions at carboxamide groups of protein-bound glutaminyl residues, usually with a primary amino group as substrate.
- Preferred homo- and hetero-bifunctional reagents contain two identical or two dissimilar sites, respectively, which may be reactive for amino, sulfhydryl, guanidino, indole, or nonspecific groups.
- the sites on the cross-linker are amino-reactive groups.
- amino-reactive groups include carbonate esters, N- hydroxysuccinimide (NHS) esters, imidoesters, isocyanates, acylhalides, arylazides, p- nitrophenyl esters, aldehydes, and sulfonyl chlorides.
- NHS esters react preferentially with the primary (including aromatic) amino groups of a modified sugar component.
- the imidazole groups of histidines are known to compete with primary amines for reaction, but the reaction products are unstable and readily hydro lyzed.
- the reaction involves the nucleophilic attack of an amine on the acid carboxyl of an NHS ester to form an amide, releasing the N-hydroxysuccinimide. Thus, the positive charge ofthe original amino group is lost.
- [0239-]" •' "I ⁇ i ⁇ ab'eStbfs'ar ' e the ' m'o'st'specific acylating reagents for reaction with the amine groups ofthe modified sugar components.
- imidoesters react only with primary amines.
- Primary amines attack imidates nucleophilically to produce an intermediate that breaks down to amidine at high pH or to a new imidate at low pH.
- the new imidate can react with another primary amine, thus crosslinking two amino groups, a case of a putatively monofunctional imidate reacting bifunctionally.
- the principal product of reaction with primary amines is an amidine that is a stronger base than the original amine. The positive charge ofthe original amino group is therefore retained.
- Isocyanates (and isothiocyanates) react with the primary amines ofthe modified sugar components to form stable bonds. Their reactions with sulfhydryl, imidazole, and tyrosyl groups give relatively unstable products.
- Acylazides are also used as amino-specific reagents in which nucleophilic amines of the affinity component attack acidic carboxyl groups under slightly alkaline conditions, e.g. pH 8.5.
- Arylhalides such as l,5-difluoro-2,4-dinitrobenzene react preferentially with the amino groups and tyrosine phenolic groups of modified sugar components, but also with sulfhydryl and imidazole groups.
- p-Nitrophenyl esters of mono- and dicarboxylic acids are also useful amino-reactive groups. Although the reagent specificity is not very high, ⁇ - and ⁇ -amino groups appear to react most rapidly.
- Aldehydes such as glutaraldehyde react with primary amines of modified sugar.
- unstable Schiff bases are formed upon reaction ofthe amino groups with the aldehydes ofthe aldehydes, glutaraldehyde is capable of modifying the modified sugar with stable crosslinks.
- the cyclic polymers undergo a dehydration to form ⁇ - ⁇ unsaturated aldehyde polymers.
- Schiff bases are stable, when conjugated to another double bond. The resonant interaction of both double bonds prevents hydrolysis ofthe Schiff linkage.
- amines at high local concentrations can attack the ethylenic double bond to form a stable Michael addition product.
- Aromatic sulfonyl chlorides react with a variety of sites ofthe modified sugar components, but reaction with the amino groups is the most important, resulting in a stable sulfonamide linkage.
- the sites are sulfhydryl-reactive groups.
- Useful, non-limiting examples of sulfhydryl-reactive groups include maleimides, alkyl halides, pyridyl disulfides, and thiophthalimides.
- Maleimides react preferentially with the sulfhydryl group ofthe modified sugar components to form stable thioether bonds. They also react at a much slower rate with primary amino groups and the imidazole groups of histidines.
- the maleimide group can be considered a sulfhydryl-specific group, since at this pH the reaction rate of simple thiols is 1000-fold greater than that ofthe corresponding amine.
- Alkyl halides react with sulfhydryl groups, sulfides, imidazoles, and amino groups. At neutral to slightly alkaline pH, however, alkyl halides react primarily with sulfhydryl groups to form stable thioether bonds. At higher pH, reaction with amino groups is favored.
- Carboxyl-Reactive Residue [0251]
- carbodiimides soluble in both water and organic solvent are used as carboxyl-reactive reagents. These compounds react with free carboxyl groups forming a pseudourea that can then couple to available amines yielding an amide linkage teach how to modify a carboxyl group with carbodiimde (Yamada et al, Biochemistry 20: 4836-4842, 1981).
- the present invention contemplates the use of non-specific reactive groups to link the sugar to the modifying group.
- Exemplary non-specific cross-linkers include photoactivatable groups, completely inert in the dark, which are converted to reactive species upon absorption of a photon of appropriate energy.
- Electron-deficient arylnitrenes rapidly ring- expand to form dehydroazepines, which tend to react with nucleophiles, rather than form C-H miseittiom prdkJirots,!' "li'ae v&el ⁇ Wl ⁇ of 'arylazides can be increased by the presence of electron- withdrawing substituents such as nitro or hydroxyl groups in the ring. Such substituents push the abso ⁇ tion maximum of arylazides to longer wavelength.
- Unsubstituted arylazides have an absorption maximum in the range of 260-280 nm, while hydroxy and nitroarylazides absorb significant light beyond 305 nm. Therefore, hydroxy and nitroarylazides are most preferable since they allow to employ less harmful photolysis conditions for the affinity component than unsubstituted arylazides.
- photoactivatable groups are selected from fluorinated arylazides.
- the photolysis products of fluorinated arylazides are arylnitrenes, all of which undergo the characteristic reactions of this group, including C-H bond insertion, with high efficiency (Keana et al, J. Org. Chem. 55: 3640-3647, 1990).
- photoactivatable groups are selected from benzophenone residues. Benzophenone reagents generally give higher crosslinking yields than arylazide reagents.
- photoactivatable groups are selected from diazo compounds, which form an electron-deficient carbene upon photolysis. These carbenes undergo a variety of reactions including insertion into C-H bonds, addition to double bonds (including aromatic systems), hydrogen attraction and coordination to nucleophilic centers to give carbon ions.
- photoactivatable groups are selected from diazopyruvates.
- the p-nitrophenyl ester of p-nitrophenyl diazopyruvate reacts with aliphatic amines to give diazopyruvic acid amides that undergo ultraviolet photolysis to form aldehydes.
- the photolyzed diazopyruvate-modif ⁇ ed affinity component will react like formaldehyde or glutaraldehyde forming crosslinks.
- Preferred, non-limiting examples of homobifunctional NHS esters include disuccinimidyl glutarate (DSG), disuccinimidyl suberate (DSS), bis(sulfosuccinimidyl) suberate (BS), disuccinimidyl tartarate (DST), disulfosuccinimidyl tartarate (sulfo-DST), bis- carbonyloxy)ethylsulfone (sulfo-BSOCOES), ethylene glycolbis(succinimidylsuccinate) (EGS), ethylene glycolbis(sulfosuccinimidylsuccinate) (sulfo-EGS), dithiobis(succinimidyl- propionate (DSP), and dithiobis(sulfosuccinimidylpropionate (sulfo-DSP).
- DSG disuccinimidyl glutarate
- DST bis(sulfosuccin
- homobifunctional imidoesters include dimethyl malonimidate (DMM), dimethyl succinimidate (DMSC), dimethyl adipimidate (DMA), dimethyl pimelimidate (DMP), dimethyl suberimidate (DMS), dimethyl-3,3'-oxydipropionimidate (DODP), dimethyl-3 ,3 '-(methylenedioxy)dipropionimidate (DMDP), dimethyl-,3 '- (dimethyl enedioxy)dipropionimidate (DDDP), dimethyl-3 ,3 '-(tetramethylenedioxy)- dipropionimidate (DTDP), and dimethyl-3 ,3'-dithiobispropionimidate (DTBP).
- DM malonimidate
- DMSC dimethyl succinimidate
- DMA dimethyl adipimidate
- DMP dimethyl pimelimidate
- DMS dimethyl suberimidate
- DODP dimethyl-3,3'-oxydipropionimidate
- DMDP
- homobifunctional isothiocyanates include: p- phenylenediisothiocyanate (DITC), and 4,4'-diisothiocyano-2,2'-disulfonic acid stilbene (DIDS).
- DITC p- phenylenediisothiocyanate
- DIDS 4,4'-diisothiocyano-2,2'-disulfonic acid stilbene
- Preferred, non-limiting examples of homobifunctional isocyanates include xylene- diisocyanate, toluene-2,4-diisocyanate, toluene-2-isocyanate-4-isothiocyanate, 3- methoxydiphenylmethane-4,4'-diisocyanate, 2,2'-dicarboxy-4,4'-azophenyldiisocyanate, and hexamethylenediisocyanate.
- homobifunctional arylhalides include 1,5- difluoro-2,4-dinitrobenzene (DFDNB), and 4,4'-difluoro-3,3'-dinitrophenyl-sulfone.
- Preferred, non-limiting examples of homobifunctional aliphatic aldehyde reagents include glyoxal, malondialdehyde, and glutaraldehyde.
- Preferred, non-limiting examples of homobifunctional acylating reagents include nitrophenyl esters of dicarboxylic acids.
- Preferred, non-limiting examples of homobifunctional aromatic sulfonyl chlorides include phenol-2,4-disulfonyl chloride, and ⁇ -naphthol-2,4-disulfonyl chloride.
- Preferred, non-limiting examples of additional amino-reactive homobifunctional reagents include erythritolbiscarbonate which reacts with amines to give biscarbamates.
- homobifunctional maleimides include bismaleimidohexane (BMH), N,N'-(l,3-phenylene) bismaleimide, N,N'-(1,2- phenylene)bismaleimide, azophenyldimaleimide, and bis(N-maleimidomethyl)ether.
- Preferred, non-limiting examples of homobifunctional pyridyl disulfides include l,4-di-3'-(2'-pyridyldithio)propionamidobutane (DPDPB).
- Preferred, non- limiting examples of homobifunctional alkyl halides include 2,2'- dicarboxy-4,4'-diiodoacetamidoazobenzene, ⁇ , ⁇ '-diiodo-p-xylenesulfonic acid, ⁇ , ⁇ '-dibromo- p-xylenesulfonic acid, N,N'-bis(b-bromoethyl)benzylamine, N,N'- di(bromoacetyl)phenylthydrazine, and 1 ,2-di(bromoacetyl)amino-3 -phenylpropane.
- homobifunctional photoactivatable crosslinker examples include bis- ⁇ -(4-azidosalicylamido)ethyldisulfide (BASED), di-N-(2-nitro-4-azidophenyl)- cystamine-S,S-dioxide (DNCO), and 4,4'-dithiobisphenylazide.
- hetero-bifunctional reagents with a pyridyl disulfide moiety and an amino-reactive NHS ester include N-succinimidyl-3-(2- pyridyldithio)propionate (SPDP), succinimidyl 6-3-(2-pyridyldithio)propionamidohexanoate (LC-SPDP), sulfosuccinimidyl 6-3-(2-pyridyldithio)propionamidohexanoate (sulfo- LCSPDP), 4-succinimidyloxycarbonyl- ⁇ -methyl- ⁇ -(2-pyridyldithio)toluene (SMPT), and sulfosuccinimidyl 6- ⁇ -methyl- ⁇ -(2-pyridyldithio)toluamidohexanoate (sulfo-LC-SMPT).
- SPDP N-succinimid
- hetero-bifunctional reagents with a maleimide moiety and an amino-reactive NHS ester include succinimidyl maleimidylacetate (AMAS), succinimidyl 3-maleimidylpropionate (BMPS), N- ⁇ -maleimidobutyryloxysuccinimide ester (GMBS)N- ⁇ -maleimidobutyryloxysulfo succinimide ester (sulfo-GMBS) succinimidyl 6- maleimidylhexanoate (EMCS), succinimidyl 3-maleimidylbenzoate (SMB), m- maleimidobenzoyl-N-hydroxysuccinimide ester (MBS), m-maleimidobenzoyl-N-
- hetero-bifunctional reagents with an alkyl halide moiety and an amino-reactive NHS ester include N-succinimidyl-(4- iodoacetyl)aminobenzoate (SIAB), sulfosuccinimidyl-(4-iodoacetyl)aminobenzoate (sulfo- SIAB), succinimidyl-6-(iodoacetyl)aminohexanoate (SIAX), succinimidyl-6-(6-((iodoacetyl)- amino)hexanoylamino)hexanoate (SIAXX), succinimidyl-6-(((4-(iodoacetyl)-a
- a preferred example of a hetero-bifunctional reagent with an amino-reactive NHS ester and an alkyl dihalide moiety is N-hydroxysuccinimidyl 2,3-dibromopropionate (SDBP). SDBP introduces intramolecular crosslinks to the affinity component by conjugating its amino groups. The reactivity ofthe dibromopropionyl moiety towards primary amine groups is controlled by the reaction temperature (McKenzie et al, Protein Chem. 7: 581-592 (1988)).
- hetero-bifunctional reagents with an alkyl halide moiety and an amino-reactive p-nitrophenyl ester moiety include p-nitrophenyl iodoacetate (NPIA).
- NPIA p-nitrophenyl iodoacetate
- the linker group is provided with a group that can be cleaved to release the modifying group from the sugar residue.
- Many cleaveable groups are known in the art. See, for example, Jung et al, Biochem. Biophys. Ada 761: 152-162 (1983); Joshi et al, J. Biol. Chem. 265: 14518-14525 (1990); Zarling et al, J. Immunol 124: 913-920 (1980); Bouizar et al, Eur. J. Biochem. 155: 141-147 (1986); Park et al, J. Biol. Chem.
- Exemplary cleaveable moieties can be cleaved using light, heat or reagents such as thiols, hydroxylamine, bases, periodate and the like. Moreover, certain preferred groups are cleaved in vivo in response to being endocytized (e.g., cis-aconityl; see, Shen et al, Biochem. Biophys. Res. Commun. 102: 1048 (1991)). Preferred cleaveable groups comprise a cleaveable moiety which is a member selected from the group consisting of disulfide, ester, imide, carbonate, nitrobenzyl, phenacyl and benzoin groups.
- the modified sugars are conjugated to a glycosylated or non-glycosylated peptide using an appropriate enzyme to mediate the conjugation.
- concentrations of the modified donor sugar(s), enzyme(s) and acceptor peptide(s) are selected such that glycosylation proceeds until the acceptor is consumed.
- glycosyltransferases A number of methods of using glycosyltransferases to synthesize desired oligosaccharide structures are known and are generally applicable to the instant invention. Exemplary methods are described, for instance, WO 96/32491, Ito et al, Pure Appl. Chem. 65: 753 (1993), and U.S. Pat. Nos. 5,352,670, 5,374,541, and 5,545,553. [0283] The present invention is practiced using a single glycosyltransferase or a combination of glycosyltransferases.
- e enzymes ana substrates are preferably combined in an initial reaction mixture, or the enzymes and reagents for a second enzymatic reaction are added to the reaction medium once the first enzymatic reaction is complete or nearly complete.
- each ofthe first and second enzyme is a glycosyltransferase.
- one enzyme is an endoglycosidase.
- more than two enzymes are used to assemble the modified glycoprotein ofthe invention. The enzymes are used to alter a saccharide structure on the peptide at any point either before or after the addition ofthe modified sugar to the peptide.
- the method makes use of one or more exo- or endoglycosidase.
- the glycosidase is typically a mutant, which is engineered to form glycosyl bonds rather than cleave them.
- the mutant glycanase typically includes a substitution of an amino acid residue for an active site acidic amino acid residue.
- the substituted active site residues will typically be Asp at position 130, Glu at position 132 or a combination thereof.
- the amino acids are generally replaced with serine, alanine, asparagine, or glutamine.
- the mutant enzyme catalyzes the reaction, usually by a synthesis step that is analogous to the reverse reaction ofthe endoglycanase hydrolysis step.
- the glycosyl donor molecule e.g., a desired oligo- or mono-saccharide structure
- the leaving group can be a halogen, such as fluoride.
- the leaving group is a Asn, or a Asn- peptide moiety.
- the GlcNAc residue on the glycosyl donor molecule is modified.
- the GlcNAc residue may comprise a 1,2 oxazoline moiety.
- each ofthe enzymes utilized to produce a conjugate of the invention are present in a catalytic amount.
- the catalytic amount of a particular enzyme varies according to the concentration of that enzyme's substrate as well as to reaction conditions- ⁇ uc>l
- the temperature at which an above process is carried out can range from just above freezing to the temperature at which the most sensitive enzyme denatures. Preferred temperature ranges are about 0 °C to about 55 °C, and more preferably about 20 ° C to about 30 °C. In another exemplary embodiment, one or more components ofthe present method are conducted at an elevated temperature using a thermophilic enzyme. ⁇
- the reaction mixture is maintained for a period of time sufficient for the acceptor to , be glycosylated, thereby forming the desired conjugate. Some ofthe conjugate can often be detected after a few hours, with recoverable amounts usually being obtained within 24 hours or less.
- rate of reaction is dependent on a number of variable factors (e.g, enzyme concentration, donor concentration, acceptor concentration, temperature, solvent volume), which are optimized for a selected system.
- the present invention also provides for the industrial-scale production of modified peptides.
- an industrial scale generally produces at least about 250 mg, preferably at least about 500 mg, and more preferably at least about 1 gram of finished, purified conjugate, preferably after a single reaction cycle, i.e., the conjugate is not a combination the reaction products from identical, consecutively iterated synthesis cycles.
- the invention is exemplified by the conjugation of modified sialic acid moieties to a glycosylated peptide.
- the exemplary modified sialic acid is labeled with m-PEG.
- An enzymatic approach can be used for the selective introduction of m-PEG-ylated or m-PPG-ylated carbohydrates onto a peptide or glycopeptide.
- the method utilizes modified sugars containing PEG, PPG, or a masked reactive functional group, and is combined with the appropriate glycosyltransferase or glycosynthase.
- the PEG or PPG can be introduced directly onto the peptide backbone, onto existing sugar residues of a glycopeptide or onto sugar residues that have been added to a peptide.
- acceptor for the sialyltransferase is present on the peptide to be modified by the methods ofthe present invention either as a naturally occurring structure or one placed there recombinantly, enzymatically or chemically.
- Suitable acceptors include, for example, galactosyl acceptors such as Gal ⁇ l,4GlcNAc, Gal ⁇ l,4GalNAc, Gal ⁇ 1,3 GalNAc, lacto-N- tetraose, Gal ⁇ 1,3 GlcNAc, GalNAc, Gal ⁇ 1,3 GalNAc, Gal ⁇ l,6GlcNAc, Gal ⁇ l,4Glc (lactose), and other acceptors known to those of skill in the art (see, e.g., Paulson et al, J. Biol. Chem. 253: 5617-5624 (1978)).
- an acceptor for the sialyltransferase is present on the glycopeptide to be modified upon in vivo synthesis ofthe glycopeptide.
- Such glycopeptides can be sialylated using the claimed methods without prior modification ofthe glycosylation pattern ofthe glycopeptide.
- the methods ofthe invention can be used to sialylate a peptide that does not include a suitable acceptor; one first modifies the peptide to include an acceptor by methods known to those of skill in the art.
- a GalNAc residue is added by the action of a GalNAc transferase.
- the galactosyl acceptor is assembled by attaching a galactose residue to an appropriate acceptor linked to the peptide, e.g., a GalNAc.
- the method includes incubating the peptide to be modified with a reaction mixture that contains a suitable amount of a galactosyltransferase (e.g., Gal ⁇ 1,3 or Gal ⁇ 1,4), and a suitable galactosyl donor (e.g., UDP-galactose).
- a galactosyltransferase e.g., Gal ⁇ 1,3 or Gal ⁇ 1,4
- a suitable galactosyl donor e.g., UDP-galactose
- glycopeptide-linked oligosaccharides are first "trimmed," either in whole or in part, to expose either an acceptor for the sialyltransferase or a moiety to which one or more appropriate residues can be added to obtain a suitable , acceptor.
- Enzymes such as glycosyltransferases and endoglycosidases (see, for example U.S. Patent No. 5,716,812) are useful for the attaching and trimming reactions.
- an O-linked carbohydrate residue is "trimmed" prior to the addition ofthe modified sugar.
- a GalNAc-Gal residue is trimmed back to GalNAc.
- a modified sugar bearing a water-soluble polymer is conjugated to one or more of the sugar residues exposed by the "trimming.”
- a glycopeptide is "trimmed” and a water-soluble polymer is added to the resulting O-side chain amino acid or glycopeptide glycan via a saccharyl moiety, e.g., Sia, Gal, or GalNAc moiety conjugated to the water-soluble polymer.
- the modified saccharyl moiety is attached to an acceptor site on the "trimmed" glycopeptide.
- an unmodified saccharyl moiety e.g., Gal can be added the terminus ofthe O-linked glycan.
- a water-soluble polymer is added to a GalNAc residue via a modified sugar having a galactose residue.
- an unmodified Gal can be added to the terminal GalNAc residue.
- a water-soluble polymer is added onto a Gal residue using a modified sialic acid.
- an O-linked glycosyl residue is "trimmed back" to the GalNAc attached to the amino acid.
- a water-soluble polymer is added via a Gal modified with the polymer.
- an unmodified Gal is added to the GalNAc, followed by a Gal with an attached water-soluble polymer.
- one or more unmodified Gal residue is added to the GalNAc, followed by a sialic acid moiety modified with a water-soluble polymer.
- the modified sugar can be added to the termini ofthe carbohydrate moiety as set forth above, or it can be intermediate between the peptide core and the terminus ofthe carbohydrate.
- the water-soluble polymer is added to a terminal Gal residue using a polymer modified sialic acid.
- An appropriate sialyltransferase is used to add a modified sialic acid. The approach is summarized in Scheme 5.
- a masked reactive functionality is present on the sialic acid.
- the masked reactive group is preferably unaffected by the conditions used to attach the modified sialic acid to the peptide.
- the mask is removed and the peptide is conjugated with an agent such as PEG, PPG, a therapeutic moiety, biomolecule or other agent.
- the agent is conjugated to the peptide in a specific manner by its reaction with the unmasked reactive group on the modified sugar residue.
- Any modified sugar can be used with its appropriate glycosyltransferase, depending on the terminal sugars ofthe oligosaccharide side chains ofthe glycopeptide (Table 2).
- the terminal sugar ofthe glycopeptide required for introduction ofthe PEG- ylated or PPG-ylated structure can be introduced naturally during expression or it can be produced post expression using the appropriate glycosidase(s), glycosyltransferase(s) or mix of glycosidase(s) and glycosyltransferase(s).
- Ligand of interest acyl-PEG, acyl-PPG, alkyl-PEG, acyl-alkyl-PEG, acyl-alkyl-PEG, carbamoyl-PEG, carbamoyl-PPG, PEG, PPG,
- Q H 2 , O, S, NH, N-R. acyl-aryl-PEG, acyl-aryl-PPG, aryl-PEG, aryl-PPG, Mannose-g-phosphate, heparin, heparan, SLex, Mannose, FGF, VFGF,
- R, R H, Linker-M, M. protein, chondroitin, keratan, dermatan, albumin, integrins, peptides, etc.
- M Ligand of interest ⁇ ⁇ f .• • lft.'a' ' ⁇ rth' .'ex ⁇ lSry»i bodiment, UDP-galactose-PEG is reacted with bovine milk ⁇ l,4-galactosyltransferase, thereby transferring the modified galactose to the appropriate terminal N-acetylglucosamine structure.
- the terminal GlcNAc residues on the glycopeptide may be produced during expression, as may occur in such expression systems as mammalian, insect, plant or fungus, but also can be produced by treating the glycopeptide with a sialidase and/or glycosidase and/or glycosyltransferase, as required.
- a GlcNAc transferase such as GNT1-5, is utilized to transfer PEGylated-GlcN to a terminal mannose residue on a glycopeptide.
- an the N- and/or O-linked glycan structures are enzymatically removed from a glycopeptide to expose an amino acid or a terminal glycosyl residue that is subsequently conjugated with the modified sugar.
- an endoglycanase is used to remove the N-linked structures of a glycopeptide to expose a terminal GlcNAc as a GlcNAc-linked-Asn on the glycopeptide.
- UDP-Gal-PEG and the appropriate galactosyltransferase is used to introduce the PEG- or PPG-galactose functionality onto the exposed GlcNAc.
- the modified sugar is added directly to the peptide backbone using a glycosyltransferase known to transfer sugar residues to the peptide backbone.
- a glycosyltransferase known to transfer sugar residues to the peptide backbone.
- This exemplary embodiment is set forth in Scheme 7.
- Exemplary glycosyltransferases useful in practicing the present invention include, but are not limited to, GalNAc transferases (GalNAc Tl-20), GlcNAc transferases, fucosyltransferases, glucosyltransferases, xylosylrransferases, mannosyltransferases and the like. Use of this approach allows the direct addition of modified sugars onto peptides that lack any carbohydrates or, alternatively, onto existing glycopeptides.
- the addition ofthe modified sugar occurs at specific positions on the peptide backbone as defined by the substrate specificity ofthe glycosyltransferase and not in a random manner as occurs during modification of a protein's peptide backbone using chemical methods.
- An array of agents can be introduced into proteins or glycopeptides that lack the glycosyltransferase substrate peptide sequence by engineering the appropriate amino acid sequence into the polypeptide chain.
- one or more additional chemical or enzymatic modification steps can be utilized following the conjugation ofthe modified sugar to the peptide.
- an enzyme e.g., fucosyltransferase
- a glycosyl unit e.g., fucose
- an enzymatic reaction is utilized to "cap" (e.g., sialylate) sites to which the modified sugar failed to conjugate.
- a chemical reaction is utilized to alter the structure ofthe conjugated modified sugar.
- the conjugated modified sugar is reacted with agents that stabilize or destabilize its linkage with the peptide component to which the modified sugar is attached.
- a component ofthe modified sugar is deprotected following its conjugation to the peptide.
- Glycosyltransferases catalyze the addition of activated sugars (donor NDP-sugars), in a step- wise fashion, to a protein, glycopeptide, lipid or glycolipid or to the non-reducing end of a growing oligosaccharide.
- N-linked glycopeptides are synthesized via a transferase and a lipid-linked oligosaccharide donor Dol-PP-NAG Glc 3 Man 9 in an en block transfer followed by trimming ofthe core. In this case the nature ofthe "core" saccharide is somewhat different from subsequent attachments.
- a very large number of glycosyltransferases are known in the art.
- glycosyltransferase to be used in the present invention may be any as long as it can utilize the modified sugar as a sugar donor.
- examples of such enzymes include Leloir
- N-acetylgalactosaminyltransferase fucosyltransferase, sialyltransferase, mannosyltransferase, xylosyltransferase, glucurononyltransferase and the like.
- glycosyltransferase For enzymatic saccharide syntheses that involve glycosyltransferase reactions, glycosyltransferase can be cloned, or isolated from any source. Many cloned glycosyltransferases are known, as are their polynucleotide sequences. See, e.g., "The WWW Guide To Cloned Glycosyltransferases," (http://www.vei.co.uk/TGN/gt guide.htm).
- Glycosyltransferase amino acid sequences and nucleotide sequences encoding glycosyltransferases from which the amino acid sequences can be deduced are also found in various publicly available databases, including GenBank, Swiss-Prot, EMBL, and others.
- Glycosyltransferases that can be employed in the methods ofthe invention include, but are not limited to, galactosyltransferases, fucosyltransferases, glucosyltransferases, N- acetylgalactosaminyltransferases, N-acetylglucosaminyltransferases, glucuronyltransferases, sialyltransferases, mannosyltransferases, glucuronic acid transferases, galacturonic acid transferases, and oligosaccharyltransferases.
- Suitable glycosyltransferases include those obtained from eukaryotes, as well as from prokaryotes.
- DNA encoding the enzyme glycosyltransferases may be obtained by chemical synthesis, by screening reverse transcripts of mRNA from appropriate cells or cell line cultures, by screening genomic libraries from appropriate cells, or by combinations of these procedures. Screening of mRNA or genomic DNA may be carried out with oligonucleotide probes generated from the glycosyltransferases gene sequence. Probes may be labeled with a detectable group such as a fluorescent group, a radioactive atom or a chemiluminescent group in accordance with known procedures and used in conventional hybridization assays.
- a detectable group such as a fluorescent group, a radioactive atom or a chemiluminescent group in accordance with known procedures and used in conventional hybridization assays.
- glycosyltransferases gene sequences may be obtained by use ofthe polymerase chain reaction (PCR) procedure, with the PCR oligonucleotide primers being produced from the glycosyltransferases gene sequence.
- PCR polymerase chain reaction
- the glycosyltransferases enzyme may be synthesized in host cells transformed with vectors containing DNA encoding the glycosyltransferases enzyme.
- a vector is a replicable DNA construct. Nectors are used either to amplify D ⁇ A encoding the glycosyltransferases enzyme and/or to express D ⁇ A which encodes the glycosyltransferases enzyme.
- An expression vector is a replicable D ⁇ A construct in which a D ⁇ A sequence encoding the ⁇ iycos ; yitra ⁇ Srer ⁇ 'es.enz riJte:: ⁇ S'''o ⁇ i@rably linked to suitable control sequences capable of effecting the expression ofthe glycosyltransferases enzyme in a suitable host.
- suitable control sequences capable of effecting the expression ofthe glycosyltransferases enzyme in a suitable host.
- control sequences include a transcriptional promoter, an optional operator sequence to control transcription, a sequence encoding suitable mRNA ribosomal binding sites, and sequences which control the termination of transcription and translation.
- Amplification vectors do not require expression control domains. All that is needed is the ability to replicate in a host, usually conferred by an origin of replication, and a selection gene to facilitate recognition of transformants. Fucosyltransferases
- a glycosyltransferase used in the method ofthe invention is a fucosyltransferase.
- Fucosyltransferases are known to those of skill in the art.
- Exemplary fuco.syltransferases include enzymes, which transfer L-fucose from GDP-fucose to a hydroxy position of an acceptor sugar.
- Fucosyltransferases that transfer non-nucleotide sugars to an acceptor are also of use in the present invention.
- the acceptor sugar is, for example, the GlcNAc in a Gal ⁇ (l— 3,4)GlcNAc ⁇ - group in an oligosaccharide glycoside.
- Suitable fucosyltransferases for this reaction include the Gal ⁇ (l ⁇ 3,4)GlcNAc ⁇ l- ⁇ (l ⁇ 3,4)fucosyltransferase (FTIII E.G. No. 2.4.1.65), which was first characterized from human milk (see, Palcic, et al, Carbohydrate Res. 190: 1-11 (1989); Prieels, et al, J. Biol. Chem. 256: 10456-10463 (1981); and Nunez, et al, Can. J. Chem.
- FTNII a sialyl ⁇ (2-> ⁇ )Gal ⁇ ((l-»3)GlcNAc ⁇ fucosyltransferase
- FTNIII a sialyl ⁇ (2-> ⁇ )Gal ⁇ ((l-»3)GlcNAc ⁇ fucosyltransferase
- a recombinant form ofthe Gal ⁇ (l— »3,4) GlcNAc ⁇ - ⁇ (l- 3,4)fucosyltransferase has also been characterized (see, Dumas, et al, Bioorg. Med.
- fucosyltransferases include, for example, ⁇ l,2 fucosyltransferase (E.C. No. 2.4.1.69). Enzymatic fucosylation can be carried out by the methods described in Mollicone, et al, Eur. J. Biochem. 191: 169-176 (1990) or U.S. Patent No. 5,374,655. Cells that are used to produce a fucosyltransferase will also include an enzymatic system for synthesizing GDP-fucose. C aBsylfa sflr kes ' ,'
- the glycosyltransferase is a galactosyltransferase.
- exemplary galactosyltransferases include ⁇ (l,3) galactosyltransferases (E.C. No. 2.4.1.151, see, e.g., Dabkowski et al, Transplant Proc. 25:2921 (1993) and Yamamoto et al Nature 345: 229-233 (1990), bovine (GenBank J04989, Joziasse et al, J. Biol. Chem. 264: 14290- 14297 (1989)), murine (GenBank m26925; Larsen et al, Proc. N t 7. Acad. Sci.
- porcine GenBank L36152; Strahan et al, Immunogenetics 41: 101-105 (1995)
- Another suitable ⁇ l,3 galactosyltransferase is that which is involved in synthesis of the blood group B antigen (EC 2.4.1.37, Yamamoto et al, J. Biol. Chem. 265: 1146-1151 (1990) (human)).
- ⁇ (l,4) galactosyltransferases which include, for example, EC 2.4.1.90 (Lac ⁇ Ac synthetase) and EC 2.4.1.22 (lactose synthetase) (bovine (D'Agostaro et al, Eur. J. Biochem. 183: 211-217 (1989)), human (Masri et al, Biochem. Biophys. Res. Commun. 157: 657-663 (1988)), murine ( ⁇ akazawa et al, J. Biochem. 104: 165-168 (1988)), as well as E.C.
- GalNAc Ti ⁇ v The production of proteins such as the enzyme GalNAc Ti ⁇ v from cloned genes by genetic engineering is well known. See, eg., U.S. Pat. No. 4,761,371.
- One method involves collection of sufficient samples, then the amino acid sequence ofthe enzyme is determined by N-terminal sequencing. This information is then used to isolate a cDNA clone encoding a full-length (membrane bound) transferase which upon expression in the insect cell line Sf9 resulted in the synthesis of a fully active enzyme. The acceptor specificity ofthe enzyme is then determined using a semiquantitative analysis ofthe amino acids surrounding known glycosylation sites in 16 different proteins followed by in vitro glycosylation studies of synthetic peptides.
- Sialyltransferases are another type of glycosyltransferase that is useful in the recombinant cells and reaction mixtures ofthe invention. Cells that produce recombinant sialyltransferases will also produce CMP-sialic acid, which is a sialic acid donor for sialyltransferases.
- ST3Gal III e.g., a rat or human ST3Gal III
- ST3Gal IN ST3Gal I, ST6Gal I, ST3Gal N, ST6Gal II, ST6Gal ⁇ Ac I, ST6GalNAc II, and ST6GalNAc III
- ST3Gal III e.g., a rat or human ST3Gal III
- ⁇ (2,3)sialyltransferase (EC 2.4.99.6) transfers sialic acid to the non-reducing terminal Gal of a Gal ⁇ l— 3Glc disaccharide or glycoside.
- ⁇ (2,3)sialyltransferase (EC 2.4.99.6) transfers sialic acid to the non-reducing terminal Gal of a Gal ⁇ l— 3Glc disaccharide or glycoside.
- Another exemplary ⁇ 2,3-sialyltransferase (EC 2.4.99.4) transfers sialic acid to the non-reducing terminal Gal ofthe disaccharide or glycoside. see, Rearick et al, J. Biol. Chem. 254: 4444 (1979) and Gillespie et al, J. Biol. Chem. 267: 21004 (1992).
- Further exemplary enzymes include Gal- ⁇ -l,4-Glc ⁇ Ac ⁇ -2,6 sialyltransferase (See, Kurosawa et al. Eur. J. Biochem. 219: 375-381 (1994)).
- the sialyltransferase will be able to transfer sialic acid to the sequence Gal ⁇ l,4GlcNAc-, the most common penultimate sequence underlying the terminal sialic acid on fully sialylated carbohydrate structures (see, Table 3).
- ⁇ iaeBa'SUUSSWft ri.sc use the Gal ⁇ l,4GlcNAc sequence as an acceptor substrate
- sialyltransferase that is useful in the claimed methods is ST3Gal III, which is also referred to as ⁇ (2,3)sialyltransferase (EC 2.4.99.6).
- This enzyme catalyzes the transfer of sialic acid to the Gal of a Gal ⁇ 1,3 GlcNAc or Gal ⁇ l,4GlcNAc glycoside (see, e.g., Wen et al, J. Biol. Chem. 267: 21011 (1992); Van den Eijnden et al, J. Biol. Chem. 256: 3159 (1991)) and is responsible for sialylation of asparagine-linked oligosaccharides in glycopeptides.
- the sialic acid is linked to a Gal with the formation of an ⁇ -linkage between the two saccharides. Bonding (linkage) between the saccharides is between the 2-position of NeuAc and the 3-position of Gal.
- This particular enzyme can be isolated from rat liver
- sialyltransferases of use in the present invention include those isolated from Campylobacter jejuni, including the ⁇ (2,3). See, e.g, WO99/49051.
- Sialyltransferases other than those listed in Table 3, are also useful in an economic and efficient large-scale process for sialylation of commercially important glycopeptides.
- various amounts of each enzyme with asialo- ⁇ i AGP at 1-10 mg/ml to compare the ability ofthe sialyltransferase of interest to sialylate glycopeptides relative to either bovine ST6Gal I, ST3Gal III or both sialyltransferases.
- glycopeptides or glycopeptides, or N-linked oligosaccharides enzymatically released from the peptide backbone can be used in place of asialo-cti AGP for this evaluation.
- Sialyltransferases with the ability to sialylate N-linked oligosaccharides of glycopeptides more efficiently than ST6Gal I are useful in a practical large-scale process for peptide sialylation (as illustrated for ST3Gal III in this disclosure).
- glycosyltransferases can be substituted into similar transferase cycles as have been described in detail for the sialyltransferase.
- the glycosyltransferase can also be, for instance, glucosyltransferases, e.g., Alg8 (Stagljov et al, Proc. Natl. Acad. Sci. USA 91: 5977 (1994)) or Alg5 (Heesen et al, Eur. J. Biochem. 224: 71 (1994)).
- N-acetylgalactosaminylrransferases are also of use in practicing the present invention.
- Suitable N-acetylgalactosaminyltransferases include, but are not limited to, ⁇ (l,3) N-acetylgalactosaminyltransferase, ⁇ (l,4) N-acetylgalactosaminyltransferases (Nagata et al, J. Biol. Chem. 267: 12082-12089 (1992) and Smith et al, J. Biol Chem.
- N-acetylgalactosaminyltransferase Suitable N-acetylglucosaminyltransferases include GnTI (2.4.1.101, Hull et al, BBRC 176: 608 (1991)), GnTII, GnTIII (Ihara et al, J. Biochem. 113: 692 (1993)), GnTIV, and GnTV (Shoreiban et al, J. Biol. Chem.
- Mannosyltransferases are of use to transfer modified mannose moieties. Suitable mannosyltransferases include ⁇ (l,2) mannosyltransferase, ⁇ (l,3) mannosyltransferase, ⁇ (l,6) mannosyltransferase, ⁇ (l,4) mannosyltransferase, Dol-P-Man synthase, OChl, and Pmtl (see, Kornfeld et al, Annu. Rev. Biochem. 54: 631-664 (1985)).
- Xylosyl transferases are also useful in the present invention. See, for example, Rodgers, et al, Biochem.
- Prokaryotic glycosyltransferases are also useful in practicing the invention.
- Such glycosyltransferases include enzymes involved in synthesis of lipooligosaccharides (LOS), which are produced by many gram negative bacteria.
- the LOS typically have terminal glycan sequences that mimic glycoconjugates found on the surface of human epithelial cells or in host secretions (Preston et al, Critical Reviews in Microbiology 23(3): 139-180 (1996)).
- Such enzymes include, but are not limited to, the proteins ofthe rfa operons of species such as E.
- Salmonella typhimurium which include a ⁇ l,6 galactosyltransferase and a ⁇ l,3 galactosyltransferase (see, e.g., EMBL Accession Nos. M80599 and M86935 (E. coli); ⁇ MBL Accession No. S56361 (S. typhimurium)), a glucosyltransferase (Swiss-Prot Accession No. P25740 (E. coli), an ⁇ l,2-glucosyltransferase (r/ ⁇ J)(Swiss-Prot Accession No. P27129 (E. coli) and Swiss-Prot Accession No.
- glycosyltransferases for which amino acid sequences are known include those that are encoded by operons such as rfaB, which have been characterized in organisms such as Klebsiella pneumoniae, E. coli, Salmonella typhimurium, Salmonella enterica, Yersinia enter ocolitica, Mycobaderium leprosum, and the rhl operon of Pseudomonas aeruginosa.
- glycosyltransferases that are involved in producing structures containing lacto-N-neotetraose, D-galactosyl- ⁇ -l,4-N- acetyl-D-glucosaminyl- ⁇ -l,3-D-galactosyl- ⁇ -l,4-D-glucose, and the P k blood group trisaccharide sequence, D-galactosyl- ⁇ -l,4-D-galactosyl- ⁇ -l,4-D-glucose, which have been identified in the LOS ofthe mucosal pathogens Neisseria gonnorhoeae and N.
- N. meningitidis (Scholten et al, J. Med. Microbiol 41: 236-243 (1994)).
- the genes from N. meningitidis and N. gonorrhoeae that encode the glycosyltransferases involved in the biosynthesis of these structures have been identified from N. meningitidis immunotypes L3 and LI (Jennings et al, Mol Microbiol. 18: 729-740 (1995)) and the N. gonorrhoeae mutant F62 (Gotshlich, J. Exp. Med. 180: 2181-2190 (1994)).
- N. meningitidis immunotypes L3 and LI Jennings et al, Mol Microbiol. 18: 729-740 (1995)
- N. gonorrhoeae mutant F62 (Gotshlich, J. Exp. Med. 180: 2181-2190 (1994)).
- meningitidis a locus consisting of three genes, IgtA, IgtB and Ig E, encodes the glycosyltransferase enzymes required for addition ofthe last three ofthe sugars in the lacto-N-neotetraose chain (Wakarchuk et al, J. Biol. Chem. 271: 19166- 73 (1996)). Recently the enzymatic activity ofthe IgtB and IgtA gene product was demonstrated, providing the first direct evidence for their proposed glycosyltransferase 271(45): 28271-276 (1996)). In N.
- IgtD which adds ⁇ -D-Gal ⁇ Ac to the 3 position ofthe terminal galactose ofthe lacto-N-neotetraose structure
- IgtC which adds a terminal ⁇ -D-Gal to the lactose element of a truncated LOS, thus creating the P k blood group antigen structure (Gotshlich (1994), supra.).
- a separate immunotype LI also expresses the P k blood group antigen and has been shown to carry an IgtC gene (Jennings et al, (1995), supra.).
- Neisseria glycosyltransferases and associated genes are also described in USP ⁇ 5,545,553 (Gotschlich). Genes for ⁇ l,2-fucosyltransferase and ⁇ 1,3 -fucosyltransferase from Helicobader pylori has also been characterized (Martin et al, J. Biol. Chem. 272: 21349- 21356 (1997)). Also of use in the present invention are the glycosyltransferases of
- Campylobacter jejuni see, for example, http://afrnb.cnrs-rnrs.fr/ ⁇ pedro/CAZY/gtf_42.html).
- the invention also provides methods for producing peptides that include sulfated molecules, including, for example sulfated polysaccharides such as heparin, heparan sulfate, carragenen, and related compounds.
- Suitable sulfotransferases include, for example, chondroitin-6-sulphotransferase (chicken cD ⁇ A described by Fukuta et al, J. Biol. Chem. 270: 18575-18580 (1995); GenBank Accession No.
- glycosaminoglycan N- acetylglucosamine N-deacetylase/N-sulphotransferase 1 (Dixon et ⁇ /., Genomics 26: 239-241 (1995); UL18918), and glycosaminoglycan N-acetylglucosamine N-deacetylase/N- sulphotransferase 2 (murine cDNA described in Orellana et al, J. Biol. Chem. 269: 2270- 2276 (1994) and Eriksson et al, J. Biol. Chem. 269: 10438-10443 (1994); human cDNA described in GenBank Accession No. U2304).
- the enzymes utilized in the method ofthe invention are cell-bound glycosyltransferases. Although many soluble glycosyltransferases are known
- glycosyltransferases are generally in membrane- bound form when associated with cells. Many ofthe membrane-bound enzymes studied thus far are considered to be intrinsic proteins; that is, they are not released from the membranes by sonication and require detergents for solubilization. Surface glycosyltransferases have been identified on the surfaces of vertebrate and invertebrate cells, and it has also been recognized that these surface transferases maintain catalytic activity under physiological conditions.
- ⁇ .-D- galactosyl-l,4-N-acetyl-D-glucosaminide ⁇ -l,3-galactosyltransferase was transfected into COS-1 cells. The transfected cells were then cultured and assayed for ⁇ 1-3 galactosyltransferase activity.
- the methods ofthe invention utilize fusion proteins that have more than one enzymatic activity that is involved in synthesis of a desired glycopeptide conjugate.
- the fusion polypeptides can be composed of, for example, a catalytically active domain of a glycosyltransferase that is joined to a catalytically active domain of an accessory enzyme.
- the accessory enzyme catalytic domain can, for example, catalyze a step in the formation of a nucleotide sugar that is a donor for the glycosyltransferase, or catalyze a reaction involved in a glycosyltransferase cycle.
- a polynucleotide that encodes a glycosyltransferase can be joined, in-frame, to a polynucleotide that encodes an enzyme involved in nucleotide sugar synthesis.
- the resulting fusion protein can then catalyze not only the synthesis ofthe nucleotide sugar, but also the transfer ofthe sugar moiety to the acceptor molecule.
- the fusion protein can be two or more cycle enzymes linked into one expressible nucleotide sequence.
- the fusion protein includes the catalytically active domains of two or more glycosyltransferases. See, for example, 5,641,668.
- modified glycopeptides ofthe present invention can be ffe ⁇ d ⁇ lf de i ne IWd'nitriyifffifirel' utilizing various suitable fusion proteins (see, for example, PCT Patent Application PCT/CA98/01180, which was published as WO 99/31224 on June 24, 1999.)
- the present invention also provides for the use of enzymes that are immobilized on a solid and/or soluble support.
- a glycosyltransferase that is conjugated to a PEG via an intact glycosyl linker according to the methods of the invention.
- the PEG-linker-enzyme conjugate is optionally attached to solid support.
- solid supported enzymes in the methods of the invention simplifies the work up ofthe reaction mixture and purification ofthe reaction product, and also enables the facile recovery ofthe enzyme.
- the glycosyltransferase conjugate is utilized in the methods ofthe invention. Other combinations of enzymes and supports will be apparent to those of skill in the art.
- Glycosylation of a mutant human growth hormone may also be accomplished intracellularly by recombinant means.
- a polynucleotide sequence encoding a mutant human growth hormone, which comprises at least one newly introduced N- or O-linked glycosylation site may be transfected into a suitable host cell line, e.g., a eukaryotic cell line derived from yeast, insect, or mammalian origin.
- the mutant human growth hormone recombinantly produced from such a cell line is glycosylated by the host cell glycosylation machinery.
- glycosylated human growth hormone produced by the above processes is preferably purified before use.
- Standard, well known techniques such as thin or thick layer chromatography, column chromatography, ion exchange chromatography, or membrane filtration can be used. It is preferred to use membrane filtration, more preferably utilizing a reverse osmotic membrane, or one or more column chromatographic techniques for the recovery as is discussed hereinafter and in the literature cited herein.
- the particulate debris either host cells or lysed fragments
- the protein may be concentrated with a followed by separating the polypeptide variant from other impurities by one or more steps selected from immunoaffinity chromatography, ion-exchange column fractionation (e.g., on diethylaminoethyl (DEAE) or matrices containing carboxymethyl or sulfopropyl groups), chromatography on Blue- Sepharose, CM Blue-Sepharose, MONO-Q, MONO-S, lentil lectin-Sepharose, WGA- Sepharose, Con A-Sepharose, Ether Toyopearl, Butyl Toyopearl, Phenyl Toyopearl, SP- Sepharose, or protein A Sepharose, SDS-PAGE chromatography, si
- a glycosylated mutant human growth hormone produced in culture is usually isolated by initial extraction from cells, cell lysate, culture media, etc., followed by one or more concentration, salting-out, aqueous ion-exchange, or size-exclusion chromatography steps. Additionally, the glycoprotein may be purified by affinity chromatography. Finally, HPLC may be employed for final purification steps.
- a protease inhibitor e.g., methylsulfonylfluoride (PMSF) may be included in any of the foregoing steps to inhibit proteolysis and antibiotics may be included to prevent the growth of adventitious contaminants.
- PMSF methylsulfonylfluoride
- supernatants from systems that produce the glycosylated human growth hormone ofthe invention are first concentrated using a commercially available protein concentration filter, for example, an Amicon or Millipore Pellicon ultrafiltration unit. Following the concentration step, the concentrate may be applied to a suitable purification matrix.
- a suitable affinity matrix may comprise a ligand for the peptide, a lectin or antibody molecule bound to a suitable support.
- an anion-exchange resin may be employed, for example, a matrix or substrate having pendant DEAE groups.
- Suitable matrices include acrylamide, agarose, dextran, cellulose, or other types commonly employed in protein purification.
- a cation-exchange step may be employed.
- Suitable cation exchangers include various insoluble matrices comprising sulfopropyl or carboxymethyl groups. Sulfopropyl groups are particularly preferred.
- one or more RP-HPLC steps employing hydrophobic RP-HPLC media, e.g., silica gel having pendant methyl or other aliphatic groups, may be employed to further purify ⁇ gtM ' ft ⁇ hormone.
- hydrophobic RP-HPLC media e.g., silica gel having pendant methyl or other aliphatic groups.
- glycosylated mutant human growth hormone ofthe invention resulting from a large-scale fermentation may be purified by methods analogous to those disclosed by Urdal et al, J. Chromatog. 296: 171 (1984).
- This reference describes two sequential, RP-HPLC steps for purification of recombinant human IL-2 on a preparative HPLC column.
- techniques such as affinity chromatography, may be utilized to purify the glycoprotein.
- the biological functions ofthe glycoprotein are tested using several methods known in the art.
- the functional assays are based on various characteristics of human growth hormone, such as its specific binding to human growth hormone receptor, activation ofthe hGH receptor, and its activity in promoting cell growth. In each assay, wild- type human growth hormone is included as a positive control.
- a radioreceptor binding assay can be carried out to measure the binding between a radio-labeled hGH receptor and a mutant human growth hormone ofthe present invention. Detailed description for such an assay can be found in the literature, e.g., Tsushima et al, J. Clin.
- the animals are sacrificed on the sixth day, their foreleg knee bones taken out and the width ofthe epiphyseal plates measured.
- the weight of these rats at the start ofthe experiment and before being sacrificed is also monitored and compared among different groups receiving daily injections ofthe mutant human growth hormone at different concentrations.
- a mutant human growth hormone can be demonstrated in its ability to cause hGH-dependent tyrosine phosphorylation in IM-9 cells, which are derived from a clone of human lymphoblastoma and express human growth hormone receptor on the cell surface.
- MB-2 cells may also be sfittfbli ',, f tl
- the ' level of tyrosine phosphorylation of cellular proteins upon exposure to the mutant human growth hormone is shown by a monoclonal antibody against phosphorylated tyrosine, as described by Silva et al, Endocrinology, 132: 101 (1993) and U.S. Patent No. 6,238,915.
- the glycosylated mutant human growth hormone having desired oligosaccharide determinants described above can be used as therapeutics for treating a variety of diseases and conditions related to deficiency in growth hormone.
- Growth-related conditions that can be treated with the mutant human growth hormone ofthe present invention include: dwarfism, short-stature in children and adults, cachexia/muscle wasting, general muscular atrophy, and sex chromosome abnormality (e.g., Turner's Syndrome).
- mutant hGH ofthe present invention Other conditions may be treated using the mutant hGH ofthe present invention include: short-bowel syndrome, lipodystrophy, osteoporosis, uraemaia, burns, female infertility, bone regeneration, general diabetes, type II diabetes, osteo-arthritis, chronic obstructive pulmonary disease (COPD), and insomia.
- the mutant hGH ofthe invention may also be used to promote various healing processes, e.g., general tissue regeneration, bone regeneration, and wound healing, or as a vaccine adjunct.
- the present invention also provides pharmaceutical compositions comprising an effective amount of glycosylated mutant human growth hormone, which is produced according to the methods described above.
- Pharmaceutical compositions ofthe invention are suitable for use in a variety of drug delivery systems.
- compositions for use in the present invention are found in Remington's Pharmaceutical Sciences, Mack Publishing Company, Philadelphia, PA, 17th ed. (1985). For a brief review of methods for drug delivery, see, Langer, Science 249: 1527- 1533 (1990).
- the pharmaceutical compositions are intended for parenteral, intranasal, topical, oral, or local administration, such as by subcutaneous injection, aerosol inhalation, or transdermal adsorption, for prophylactic and/or therapeutic treatment. Commonly, the pharmaceutical compositions are administered parenterally, e.g., subcutaneously or intravenously.
- compositions for parenteral administration which comprise the glycosylated mutant human growth hormone dissolved or suspended in an acceptable carrier, preferably an aqueous carrier, e.g., water, buffered water, saline, PBS and the like.
- an acceptable carrier preferably an aqueous carrier, e.g., water, buffered water, saline, PBS and the like.
- the compositions may also contain detergents such as Tween 20 and Tween 80; sM ⁇ ize ''s e ⁇ ; ⁇ «fc ⁇ itii ⁇ ''fe'®r 'M
- compositions may contain pharmaceutically acceptable auxiliary substances as required to approximate physiological conditions, such as pH adjusting and buffering agents, tonicity adjusting agents, wetting agents, detergents and the like.
- auxiliary substances such as pH adjusting and buffering agents, tonicity adjusting agents, wetting agents, detergents and the like.
- These compositions may be sterilized by conventional sterilization techniques, or may be sterile filtered.
- the resulting aqueous solutions may be packaged for use as is, or lyophilized, the lyophilized preparation being combined with a sterile aqueous carrier prior to administration.
- the pH ofthe preparations typically will be between 3 and 11, more preferably from 5 to 9, and most preferably from 7 and 8.
- the compositions containing the glycosylated mutant human growth hormone can be administered for prophylactic and/or therapeutic treatments.
- compositions are administered to a patient already suffering from a disease or condition related to growth hormone deficiency, in an amount sufficient to cure or at least partially arrest the symptoms ofthe disease and its complications.
- An amount adequate to accomplish this is defined as a "therapeutically effective dose.” Amounts effective for this use will depend on the severity ofthe disease or condition and the weight and general state ofthe patient, but generally range from about 0.1 mg to about 2,000 mg of glycosylated mutant human growth hormone per day for a 70 kg patient, with dosages of from about 5 mg to about 200 mg ofthe compounds per day being more commonly used.
- compositions containing the glycosylated mutant human growth hormone ofthe invention are administered to a patient susceptible to or otherwise at risk of a particular disease.
- Such an amount is defined to be a “prophylactically effective dose.”
- the precise amounts again depend on the patient's state of health and weight, but generally range from about 0.1 mg to about 1,000 mg per 70 kilogram patient, more commonly from about 5 mg to about 200 mg per 70 kg of body weight.
- compositions can be carried out with dose levels and pattern being selected by the treating physician.
- pharmaceutical formulations should provide a quantity ofthe glycosylated mutant human growth hormone of this invention sufficient to effectively treat the patient.
- Human growth hormone occurs in a variety of different isoforms and different amino acid sequences.
- the two best characterized forms include placental derived hGH, which is also known as GH-N (PDB P01242) and pituitary derived hGH, which is also known as somatotropin or GH- ⁇ (P01241); see Figure 1.
- the pituitary derived hGH is not glycosylated and is produced in Escherichia coli as a therapeutic.
- the placental derived hGH (GH-N) has one ⁇ -glycosylation site at amino acid 140 (see Table 4 and FIG. 1, see arrow).
- the pituitary derived hGH (GH-N) can be modified at amino acid position 140 to introduce an N-linked glycosylation site by mutating the nucleotide sequence encoding this polypeptide so that instead of encoding the wild-type lysine (abbreviated as "k” at amino acid 140 ofthe GH-N polypeptide sequence in Table 5 and FIG. 1, see arrow), the nucleotide sequence will encode an asparagine (abbreviated "n") at amino acid position 140 of GH-N (see also FIG. 2).
- This mutated pituitary derived hGH can then be glycosylated or glycoconjugated (see WO 03/31464, inco ⁇ orated herein by reference).
- the mutated pituitary derived hGH is glycoPEGylated, wherein a polyethylene glycol (PEG) moiety is conjugated to the mutated pituitary derived hGH polypeptide via a glycosyl linkage (see WO 03/31464, incorporated herein by reference).
- FIG.3 describes the GlycoPEGylation of an hGH N-linked glycan mutant produced in either Sf9 insect cells or mammalian cells.
- GlycoPEGylation ofthe mibtitedi iM idMvedllh ⁇ H-Sfeei ected to result in improved biophysical properties that may include but are not limited to improved half-life, improved area under the curve (AUC) values, reduced clearance, and reduced immunogenicity.
- Example 2 An alternative approach is to create an O-linked glycosylation site into the pituitary derived hGH polypeptide.
- This O-linked glycosylation site may then be used as a site on which the mutated hGH polypeptide can be glycoPEGylated using a GalNAcT 2 enzyme or the like.
- One or more additional transferases may then be used to add glycans or glycoconjugates to that site.
- the mutated pituitary derived hGH polypeptide is glycoPEGylated.
- FIG.4 describes the glycoPEGylation of an hGH O-linked glycan mutant produced in Escherichia coli.
- the protein loop regions on pituitary derived hGH are best suited for mutation to introduce a glycosylation site (FIG. 5).
- the nucleotide sequence that encodes amino acids 1-6 FPTIPL; SEQ ID NO: 10
- amino acids 48-52 PQTSL; SEQ ID NO: 11
- amino acids 59-64 PTPSNR; SEQ ID NO: 12
- amino acids 133-139 PRTGQIF; SEQ ID NO: 13
- amino acids 133-145 PRTGQIFKQTYSK
- SEQ ID NO: 14 amino acids 139-142
- FKQT SEQ ID NO: 15
- FIG. 6 illustrates six (6) of these introduced O-linked glycosylation sites.
- the arrows in Figure 6 each represent the threonine residue on which O-linked glycosylation will occur in the GH-N O-linked glycan hGH mutant.
- FIG. 7 and FIG. 8 each illustrates two additional GH-N O-linked glycan hGH mutants.
- This example describes amino acid sequence mutations introducing O-linked glycosylation sites, i.e., serine or threonine residues, into a preferably proline-containing site of a wild- type human growth hormone sequence or any modified version thereof.
- N-terminus of a wild-type hGH, FP 2 TIP 5 LS; SEQ ID NO: 16 is replaced with either MXnTP 2 TIP 5 LS or MAPTSSXnP 2 TIP 5 LS.
- Preferred examples include:
- MQTPTIPLS MQTPTIPLS; SEQ ID NO: 18 MAPTSSPTIPLS; SEQ ID NO: 19 MAPTSSSPTIPLS (IL-2 N-terminus); SEQ ID NO:20 MPTTFPTIPLS; SEQ ID NO:21 MPTSSPTIPLS; SEQ ID NO:22
- mutants the N-terminus of a wild-type hGH, FP 2 TIP 5 LS; SEQ ID NO:24, is replaced with ZmP 2 T XnBoP 5 LS.
- Preferred mutations include:
- MFPTSIPLS SEQ ID NO:26 MFPTSSPLS; SEQ ID NO:27 MTPTQIPLS; SEQ ID NO:28 MFPTTTPLS; SEQ ID NO:29
- ammo acid sequence surrounding P AYIP KEQKY; SEQ ID NO:30
- AZmJqP 37 OrXnBo ⁇ pY where at least one of Z, J, O, X, and B is independently selected from either Thr or Ser;
- ⁇ may include Lys (K) and
- X may be Asp (D).
- Preferred examples include:
- amino acid sequence surrounding P 48 , LQNP 48 QTSLC; SEQ ID NO:35 is replaced with LZmJqP 48 OrXnBoLC, where at least one of Z, J, O, and X are independently selected from either Thr or Ser.
- Preferred examples include:
- amino acid sequence surrounding P 59 SESIP 59 TPNREET; SEQ ID NO:38, is replaced with SZmUsJqP 59 TPOrXnBo ⁇ rT, where at least one of Z, J, O, B, ⁇ , U, and X is independently selected from either Thr or Ser; B, ⁇ , and Z may include charged amino acids.
- Preferred examples include:
- Preferred examples include:
- SWLEP 89 TQGLRS SEQ ID NO:49 SWLEP 89 TQGATS; SEQ ID NO:50 SSQTP 89 NQFLRS; SEQ ID ⁇ O:51 SWLEP 89 TSSLSS; SEQ ID NO:52 SMVTP 89 VQFLRS; SEQ ID NO:53 7 Intdmal i iMttyibn,Sife»
- EDGSP 133 TNGQIF EDGSP 133 TNGQIF
- SEQ ID ⁇ O:58 EDGSP 133 TTTQIF
- SEQ ID NO:59 EDGSP 133 TNGQIF
- amino acid sequence surrounding P 140 GQIFK 140 QTYS; SEQ ID NO:65, is replace with GZmUsJq ⁇ r 140 OrXnBoS, where at least one of Z, U, J, O, B, and X is independently selected from either Thr or Ser.
- Preferred examples include:
- GQIFT 140 QTYS; SEQ ID NO:71 GQIST 140 QTYS; SEQ ID NO:72 GQIPT 140 TTYS; SEQ ID NO:73
- NEGSCGPTTTP SEQ ID ⁇ O:75 VEGSCGPTSSP; SEQ ID NO:76 VEGSCGPTQGAMP; SEQ ID NO:77
- VEGSCGPTTIP SEQ ID NO:78 NEGSCGPMVTP; SEQ ID ⁇ O:79
- X, Z, B, ⁇ , J, U, O, and ⁇ are independently selected from E (glutamate), any uncharged amino acid or dipeptide combination including M, F, MF, and the like; m, n, o, p, q, r, s, and t are independently selected from integers from 0 to 3.
- the N-terminal Met may be present or absent on any hGH mutant.
- the numbering of the amino acid residues is based on the initial unmodified sequence in which the left most residue is numbered 1. The numbering of unmodified amino acids remains unchanged following the modification. More than one ofthe above described sequence modifications may be present in a hGH mutant ofthe present invention.
Abstract
Description
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US10/556,094 US7932364B2 (en) | 2003-05-09 | 2004-05-07 | Compositions and methods for the preparation of human growth hormone glycosylation mutants |
BRPI0410164-2A BRPI0410164A (en) | 2003-05-09 | 2004-05-07 | compositions and methods for preparing human growth hormone glycosylation mutants |
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ES04751591T ES2380093T3 (en) | 2003-05-09 | 2004-05-07 | Compositions and methods for the preparation of human growth hormone glycosylation mutants |
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WO2006121569A3 (en) * | 2005-04-08 | 2008-11-20 | Neose Technologies Inc | Compositions and methods for the preparation of protease resistant human growth hormone glycosylation mutants |
JP2008542285A (en) * | 2005-05-25 | 2008-11-27 | ネオス テクノロジーズ インコーポレイテッド | Glycopegylated factor IX |
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WO2009156511A2 (en) * | 2008-06-27 | 2009-12-30 | Novo Nordisk A/S | N-glycosylated human growth hormone with prolonged circulatory half-life |
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Also Published As
Publication number | Publication date |
---|---|
MXPA05011832A (en) | 2006-02-17 |
KR20060030023A (en) | 2006-04-07 |
ATE540055T1 (en) | 2012-01-15 |
CA2524936A1 (en) | 2004-12-02 |
US7932364B2 (en) | 2011-04-26 |
EP1624847A2 (en) | 2006-02-15 |
AU2004240553A1 (en) | 2004-12-02 |
BRPI0410164A (en) | 2006-05-16 |
US20080102083A1 (en) | 2008-05-01 |
ES2380093T3 (en) | 2012-05-08 |
EP1624847A4 (en) | 2008-06-18 |
WO2004103275A3 (en) | 2007-05-18 |
JP2007523630A (en) | 2007-08-23 |
EP1624847B1 (en) | 2012-01-04 |
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