WO2005007119A2 - Assays for protease enzyme activity - Google Patents
Assays for protease enzyme activity Download PDFInfo
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- WO2005007119A2 WO2005007119A2 PCT/US2004/023083 US2004023083W WO2005007119A2 WO 2005007119 A2 WO2005007119 A2 WO 2005007119A2 US 2004023083 W US2004023083 W US 2004023083W WO 2005007119 A2 WO2005007119 A2 WO 2005007119A2
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- bioconjugate
- fluorescer
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- tether
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- C01G19/02—Oxides
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- C07—ORGANIC CHEMISTRY
- C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
- C07H21/00—Compounds containing two or more mononucleotide units having separate phosphate or polyphosphate groups linked by saccharide radicals of nucleoside groups, e.g. nucleic acids
- C07H21/04—Compounds containing two or more mononucleotide units having separate phosphate or polyphosphate groups linked by saccharide radicals of nucleoside groups, e.g. nucleic acids with deoxyribosyl as saccharide radical
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B82B1/00—Nanostructures formed by manipulation of individual atoms or molecules, or limited collections of atoms or molecules as discrete units
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y10/00—Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y5/00—Nanobiotechnology or nanomedicine, e.g. protein engineering or drug delivery
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- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B11/00—Diaryl- or thriarylmethane dyes
- C09B11/04—Diaryl- or thriarylmethane dyes derived from triarylmethanes, i.e. central C-atom is substituted by amino, cyano, alkyl
- C09B11/10—Amino derivatives of triarylmethanes
- C09B11/24—Phthaleins containing amino groups ; Phthalanes; Fluoranes; Phthalides; Rhodamine dyes; Phthaleins having heterocyclic aryl rings; Lactone or lactame forms of triarylmethane dyes
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- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B69/00—Dyes not provided for by a single group of this subclass
- C09B69/10—Polymeric dyes; Reaction products of dyes with monomers or with macromolecular compounds
- C09B69/105—Polymeric dyes; Reaction products of dyes with monomers or with macromolecular compounds containing a methine or polymethine dye
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/34—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving hydrolase
- C12Q1/37—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving hydrolase involving peptidase or proteinase
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y15/00—Nanotechnology for interacting, sensing or actuating, e.g. quantum dots as markers in protein assays or molecular motors
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- C12Q2337/00—N-linked chromogens for determinations of peptidases and proteinases
Definitions
- the present application relates generally to assays for the detection of
- the present application relates to bioconjugates that can be used to detect the activity of protease enzymes (e.g., ⁇ -secretase and caspase enzymes), kits including the bioconjugates and assays involving the use of the bioconjugates to detect enzyme activity.
- protease enzymes e.g., ⁇ -secretase and caspase enzymes
- proteolytic enzyme activity is rapidly increasing both for research, drug discovery and
- Apoptosis is a remarkable process responsible for cell death in
- Apoptosis that permits the survival of mutagenic DNA damage. Apoptosis is
- Alzheimer's disease is characterized by the extracellular deposition of
- insoluble amyloid plaques consist of 4 kD amyloid ⁇ -peptide (A ⁇ ). Glenner et al., Biochem. Biophys. Res. Commun. 1984, 120, pp. 885-890.
- a ⁇ derives from proteolysis of the amyloid precursor protein (APP) by the ⁇ and ⁇ secretases to create
- ⁇ -secretase has been shown to be essential for nerve cells to form the plaques.
- protease enzymes such as ⁇ -secretase and caspase enzymes with high
- a tether comprising a segment capable of recognizing and interacting with ⁇ -
- a fluorescer comprising a plurality of fluorescent species conjugated to a
- the plurality of fluorescent species are associated with one another such
- the quencher is capable of amplified super-quenching of the fluorescer.
- segment capable of recognizing and interacting with ⁇ -secretase can comprise the
- a sample secretase activity in a sample including: incubating the sample with a bioconjugate as set forth above; and measuring the fluorescence of the incubated sample.
- the measured fluorescence of the incubated sample is an indication of the
- the method may
- the method can include ⁇ -secretase and a test compound and the method can be an assay for the
- the fluorescer can
- secretase activity of a sample including: incubating the sample with a
- bioconjugate comprising a quencher and a ligand conjugated to a tether at first and
- the tether comprises a segment between the
- first and second locations capable of recognizing and interacting with ⁇ -secretase
- the solid support comprising a solid support associated with a plurality of fluorescent species, wherein the solid support comprises a moiety capable of binding the ligand of the bioconjugate
- bioconjugate can bind to the solid support and wherein binding of the
- bioconjugate to the solid support results in amplified superquenching of the fluorescer; allowing the ligand on the bioconjugate to bind to the solid support;
- the amount of fluorescence of the sample mixture indicates the presence and/or amount of ⁇ -
- the ligand can be a biotin moiety and the moiety on
- the solid support can be an avidin, neutravidin or streptavidin moiety.
- control and the sample mixture is an indication of the presence and/or the amount
- the sample can comprise ⁇ -secretase and a test
- compound and the method can further include: incubating a second sample containing
- a kit including: a fluorescer comprising a plurality of fluorescent species associated with a solid
- a bioconjugate comprising a quencher and a ligand conjugated to a tether
- the tether comprises a segment
- the solid support comprises a moiety capable of binding the ligand on the bioconjugate and the plurality of fluorescent species are associated with one another
- the quencher is capable of amplified superquenching of the fluorescer when
- the ligand of the bioconjugate is bound to the solid support.
- the ligand can be a biotin moiety and the moiety capable of binding the ligand can be selected from the
- recognizing and interacting with ⁇ -secretase can be the peptide sequence:
- a bioconjugate is provided
- a tether comprising a segment capable of recognizing and interacting with
- target biomolecule is located between the first and second locations on the tether and wherein the plurality of fluorescent species are associated with one another such that
- the quencher is capable of amplified quenching of the fluorescer.
- capable of recognizing and interacting with ⁇ -secretase can comprise the peptide
- enzyme activity in a sample includes: incubating the sample with a
- bioconjugate comprising a quencher conjugated to a tether, wherein the tether
- mixture indicates the presence and/or amount of target enzyme activity in the sample.
- the association between the quencher and fluorescer can be the result of coulombic-
- the fluorescer and the bioconjugate can each have an overall negative
- the quencher containing fragment can have a net positive charge.
- fluorescer can be an anionic conjugated polymer and the quencher can be a cationic
- the bioconjugate comprises:
- the fluorescer is a virtual polymer comprising an aggregate of donor cyanine dyes and the quencher is an acceptor cyanine dye which,
- the acceptor cyanine dye can be the result of charge effects or steric effects.
- the acceptor cyanine dye can be the result of charge effects or steric effects.
- the acceptor cyanine dye can be the result of charge effects or steric effects.
- the acceptor cyanine dye can be the result of charge effects or steric effects.
- the acceptor cyanine dye can be the result of charge effects or steric effects.
- the acceptor cyanine dye can be the result of charge effects or steric effects.
- the acceptor cyanine dye is a fluorescent molecule, the fluorescence of the acceptor can be measured.
- the fluorescence of the donor can be measured.
- the assay can be an
- target enzyme activity in a sample includes: incubating the sample with a bioconjugate comprising a fluorescent dye conjugated to a tether, wherein the
- tether comprises a segment which can be cleaved by the target enzyme to produce a
- the amount of fluorescence of the sample mixture indicates the
- bioconjugate by enzyme cleavage can be capable of forming a J-aggregate.
- the enzyme can be a caspase enzyme.
- the target enzyme can be caspase-3
- a fluorescer comprising a plurality of fluorescent species and a bioconjugate comprising a quencher conjugated to a tether, wherein the tether comprises a segment
- cleavage of the tether results in a quencher containing bioconjugate .
- the plurality of associated fluorescent species can
- the target caspase enzyme can be caspase-3 and
- the segment capable of being cleaved by a caspase enzyme can be the peptide
- the quencher containing bioconjugate fragment can associate with the fluorescer via
- the fluorescer and the bioconjugate can each have an overall
- a kit as set forth above is also provided wherein the fluorescer is a virtual
- polymer comprising an aggregate of donor cyanine dyes and the quencher is an
- acceptor cyanine dye when conjugated to the tether, is
- bioconjugate to form an aggregate with the donor can be the result of charge effects or steric effects.
- the acceptor cyanine dye can be a fluorescent molecule or a non-
- a bioconjugate which includes a tether comprising a segment capable of being cleaved by a caspase enzyme and a quencher conjugated to the tether.
- the caspase enzyme can be caspase-3 and the segment capable of being cleaved by a caspase enzyme can be the peptide sequence:
- a bioconjugate which includes a fluorescent dye conjugated to a tether wherein the tether comprises a segment which can be cleaved by the target enzyme to produce a fluorescent dye . containing fragment.
- the fluorescent dye containing fragment is capable of forming a dye aggregate which has a different absorption spectra than the bioconjugate.
- the target enzyme can be a caspase enzyme such as caspase-3.
- the fluorescent dye can be a cyanine dye.
- the fluorescent dye containing fragment is capable of forming a J-aggregate.
- the segment capable of being cleaved by the target enzyme can be the peptide sequence:
- FIG. 1 is an illustration of two general schemes for conducting assays for protease (e.g., ⁇ -secretase) enzyme activity.
- FIG.2 is an illustration of a quencher-tether (QT) assay for Caspase-3 enzyme
- FIG. 3 is an illustration of a J-aggregate assay format for Caspase-3 activity.
- the fluorescer e.g., fluorescent
- polymer P is co-located on the surface of a solid support such as a polymer
- microsphere along with a receptor for a specific analyte.
- the receptor can be attached
- a solid support e.g., a bead support
- biotin binding protein (BBP) association The assay is based on competition for the
- a sensor for protease enzymes which includes a reactive tether linking a fluorescer
- QTP reactive molecular
- a QTB molecule is used wherein "B” refers to a biotin group.
- B refers to a biotin group.
- the appended biotin binds to the biotin binding protein (BBP) that is co-
- the quencher When the peptide is cleaved by target enzyme, the quencher
- FIG. 1 Two general schemes for conducting protease assays, are illustrated in FIG. 1.
- bioconjugate (10) comprising a quencher (16), a biotin moiety (12) and a tether (11)
- the tether comprises a recognition sequence (14)
- ⁇ -secretase enzyme capable of being recognized (e.g., cleaved) by the ⁇ -secretase enzyme (18).
- incubated bioconjugate is then contacted (34) with a fluorescer comprising a biotin
- streptavidin groups (25) on the surface thereof is shown in FIG. 1 as the fluorescer
- a bioconjugate (10) comprising a quencher (16), a
- biotin moiety (12) and a tether (11) linking the quencher (16) and biotin moiety (12) is
- tether (11) comprises a recognition sequence (14) capable of being recognized (e.g.,
- bioconjugate (28) is then incubated (30) with a protease (e.g., ⁇ -secretase) enzyme
- a protease e.g., ⁇ -secretase
- the fluorescence from the fluorescer increases (i.e., the amount of quenching of the
- the peptide substrates employed in the QTB assay are tri-functional in that
- a target enzyme a biotin functional group on one end that facilitates the binding of the
- the ⁇ -secretase enzyme has been shown to recognize and bind the following peptide sequence:
- SEVNLDAEF SEQ ID NO:l
- a QTB peptide substrate for ⁇ -secretase comprises a tether including this sequence which is flanked by biotin on one end and a quencher on the other.
- the quencher is thus left without a biotin moiety to help bind
- cleaved substrates should not quench the fluorescence of the ensemble.
- the biotin is specifically included in the QTB bioconjugate to bring the
- the uniting interaction can easily be replaced with any system that is capable of uniting the fluorescer and the quencher.
- the uniting interaction can be any combination
- the interaction can include
- the quencher, Q is designed to absorb the radiative energy from the excited
- quenchers include, but are not
- the quencher is a non-fluorescent small molecule dye such as QSY-7 or
- the quencher is capable of amplified
- the quencher is capable of re-emitting as
- SEVNLDAEF SEQ ID NO: 1.
- This sequence may be flanked on either side by more amino acids or other chemical
- the length of the QTB tether is not critical to the assay.
- the quencher is within approximately
- the fluorescer (F) comprises a plurality of fluorescent species.
- the fluorescer is a conjugated polymer that can be either / neutral or positively or negatively charged or zwitter-ionic.
- the fluorescer (F) may
- the fluorescer may also comprise a plurality of independent small molecule fluorescent chromophores that
- the fluorescent polymer is co-
- biotin binding protein located with a biotin binding protein (BBP) either in solution or anchored to a solid-
- a positively charged PPE polymer as set forth in formula
- the polymer binds avidin through the biotin-avidin interaction to form cross-linked supra-molecular ensembles that comprise free biotin binding sites
- each of these polymer formats can be any of these polymer formats.
- BRPE Biotinylated R-Phycoerythrin
- excited polymer chromophores transfer their energy to the nearby BRPE molecules
- the fluorescent polymer is a
- the QTB is incubated with the polymer-
- the assay for ⁇ -secretase is then performed by exposing the sample containing the enzyme to QTP and following the "recovery" of fluorescence in a continuous monitoring format.
- the QTP unit has little or no
- the QTB entity is exposed to the ⁇ -
- the polymer-receptor ensemble is added to the sample and the
- buffer solution (Assay Buffer) that has been optimized to provide maximum activity of enzyme against the QTB substrate.
- the polymer is usually made up in a buffer
- the QTL assay is capable of detecting ⁇ -secretase activity in solutions of
- the QTL assay is capable of detecting the inhibition of
- the enzyme would cleave a large portion of the reactive tether present, in the presence of an effective inhibitor, the enzyme loses most
- the QTL assay provides evidence of partial or total inhibition of
- Exemplary fluorescers include a polymer or oligomer comprising a plurality of
- fluorescent repeating units or a solid support associated with a plurality of fluorescent
- one or more quenchers can each be linked to
- Exemplary solid supports include, but are
- streptavidin coated spheres not limited to, the following: streptavidin coated spheres; polymer microspheres;
- silica microspheres organic nanoparticles; inorganic nanoparticles; magnetic beads;
- magnetic particles magnetic particles; semiconductor nanoparticles; quantum dots; membranes; slides;
- the fluorescer can be selected from the group consisting of:
- conjugated oligomers conjugated oligomers; charged conjugated polymers; uncharged conjugated polymers-
- the fluorescer can be a poly(L-
- the fluorescer can also be any suitable polymer or oligomer having cyanine pendant groups.
- the fluorescer can also be any suitable polymer or oligomer having cyanine pendant groups.
- the fluorescer can also be any suitable polymer or oligomer having cyanine pendant groups.
- the fluorescer can be a virtual polymer.
- the fluorescer can be constructed from an
- the fluorescent polymer or oligomer can be associated with a solid support by
- the fluorescer can be conjugated to the tether via a protein molecule.
- Exemplary protein molecules include avidin, neutravidin, and streptavidin.
- STA-200 statine derived peptide inhibitor of ⁇ - secretase
- statine-derived peptide inhibitor of ⁇ -secretase is given below:
- Sta represents a statine residue.
- the assays are performed in the wells of microwell plates such as a 96-well or a 384-
- the assay is thus convenient for use in a conventional microplate reader
- the assay is homogeneous, sensitive
- the QTL assay for ⁇ -secretase is tolerant of the presence of DMSO up to the extent of 10% in the reaction mixture.
- the assay is tolerant of up to 10 % of
- the assay is highly robust and provides Z' -values of upwards of 0.6 at approximately
- target enzyme activity in a sample includes: incubating the sample
- a bioconjugate comprising a quencher conjugated to a tether, wherein the tether
- the target enzyme activity in the sample is the target enzyme activity in the sample.
- the above assay uses a quencher-tether (QT) bioconjugate that is unable to
- the quencher is released from the bioconjugate, thus enabling its
- the fluorescer is an anionic
- conjugated polymer and the quencher is a cationic electron or energy transfer
- the quencher-tether bioconjugate has an overall negative charge and hence does not interact with and quench the fluorescer.
- quencher is released which enables it to quench the fluorescer.
- the fluorescer is a "virtual polymer"
- the aggregate with the donor can be the result of charge effects, steric effects or a combination thereof.
- the quencher containing fragment of the bioconjugate is able to participate in the
- the acceptor cyanine dye can be either a fluorescent or a non-fluorescent molecule. If
- the acceptor cyanine is itself fluorescent, its participation in the aggregate with the
- enzyme activity in an intracellular or extracellular sample includes: incubating the sample with a bioconjugate, comprising a fluorescent dye conjugated to
- the amount of fluorescence of the sample mixture indicates the
- the fluorescent dye can be a cyanine molecule which when conjugated to the tether exists as the monomer and has
- the fluorescent dye containing fragment is released from the bioconjugate
- the sample will provide a signal whose intensity is an indicator of
- Cyanine dyes capable of forming J- Aggregates are disclosed in Lu et al..
- J-aggregated donor cyanine dyes J-aggregated donor cyanine dyes. J- Aggregate polymers are disclosed in Lu et al..
- the polymer can include any of the following:
- BBP Biotin binding protein
- D Solution Sensor as in B doped with a small amount of Phycoerythrin or related fluorescent protein conjugated to biotin;
- the peptide substrate in the above experiments can be any of those listed
- each of the substrates can be tagged with
- Example 1 To 5 ⁇ L of a 400 nM solution of BSEC-1 in assay buffer in the well of a 384-
- the microplate reader for 60 seconds, then the samples were probed for emission at
- BSEC-3 was added a 5 ⁇ L solution of ⁇ -secretase (60 ng).
- Control wells were set up here just as in Example 1. The enzyme and control wells were incubated for only ten
- each well contained 1 x 10 7 microspheres in 20 ⁇ L.
- the samples were probed for
- the RFU obtained for the control was 8111 ⁇ 707 while the sample
- Example 3 The assay performance was further improved when the polymer microsphere
- sample A was doped with a small amount of Biotin-R-Phycoerythrin (Biotin-R-PE )
- BSEC- 1 gave RFU values of 6270 ⁇ 196 for control and 9645 ⁇ 152 for
- BSEC-3b gave RFUs of 6054 -d 41 and 12265 ⁇ 913 for control and sample respectively.
- BSEC-4 gave values of 9207 ⁇ 364 and 9732 ⁇ 319 for control and sample respectively.
- Example 4 The polymer solution sensor B was prepared by mixing together 56.5 nmol of
- BBP combine with each other through the biotin-avidin interaction to form stable
- the solution sensor thus prepared was diluted appropriately with polymer
- microplate reader and the wells were probed by exciting the polymer at 440 nm and
- Polymer B with a small amount of Biotin-R-PE.
- Polymer sensor D was made at the
- control wells gave an average RFU value of 5200 ⁇ 100 while the sample wells gave a corresponding value of 14500 ⁇ 200.
- Phycoerythrin can be employed independently in the QTL assay for ⁇ -secretase.
- sample and control wells were measured at 576 nm by exciting at 490 nm and
- RFU of control was 11639 ⁇ 335 and
- RFU of sample was 18032 ⁇ 228.
- STA-200 is a well-known inhibitor of ⁇ -secretase activity. To 2.5 ⁇ L of an
- volume made up to a total of 10 ⁇ L with assay buffer.
- nM BSEC-1 solution was incubated with a pre-mixed solution of 2.5 ⁇ L of STA-200
- caspase enzymes for other protease enzymes such as caspase enzymes.
- Specific substrates for caspase- 3 enzyme activity are also described below.
- a bioconjugate comprising a
- the quencher conjugated to a tether wherein the tether comprises a segment capable of
- the association between the quencher and fluorescer can be the result of coulombic attraction, hydrogen bonding forces, van der
- bioconjugate can each have an overall negative charge and the quencher containing
- the fluorescer can be an anionic conjugated
- the bioconjugate can be represented by the following formula: D-E-N-D-QSY7' (SEQ ID ⁇ O:7)
- QSY7 represents a quencher moiety represented by the following formula:
- the polypeptide tether can be conjugated to the quencher via an amine group
- An exemplary quencher which can be conjugated to the quencher
- this quencher When conjugated to the polypeptide tether via the primary amine group, this quencher forms the QS Y7' quencher moiety.
- Other quenchers having amine groups can also be used. These quenchers can be synthesized using known chemical synthetic techniques.
- the quencher containing fragment will therefore tend to associate with a fluorescer having a net negative charge.
- the fluorescer is a virtual
- the polymer comprising an aggregate of donor cyanine dyes and the quencher is an acceptor cyanine dye which, when conjugated to the tether, is unable to form an aggregate with the donor cyanine dyes.
- the inability ofthe bioconjugate to form an aggregate with the donor cyanine dyes can be the result of charge effects or steric effects.
- the acceptor cyanine dye can be a fluorescent molecule or a non-fluorescent
- the fluorescence ofthe acceptor can be measured.
- the fluorescence ofthe donor can be
- the assay according to this embodiment ofthe invention can be an
- target enzyme activity in a sample includes: incubating the sample with a bioconjugate comprising a fluorescent dye conjugated to a tether, wherein the
- tether comprises a segment which can be cleaved by the target enzyme to produce a
- the fragment is capable of forming a dye aggregate which has a different abso ⁇ tion spectra than the bioconjugate; allowing the enzyme to cleave the bioconjugate; and
- the amount of fluorescence ofthe sample mixture indicates the
- bioconjugate by enzyme cleavage can be capable of forming a J-aggregate.
- the enzyme can be a caspase enzyme.
- the target enzyme can be caspase-3
- bioconjugate can have a structure represented by the following formula:
- Cyanine represents a cyanine dye moiety
- Exemplary cyanine dye moieties include, but are not limited to, the following: Conventional synthetic chemistry procedures can be used to conjugate the
- the tether can be
- cyanine dyes can be synthesized with side groups having functional groups
- reactive groups which can be synthesized on the dye are amino and
- cyanine dye can be synthesized with an amino or carboxylic acid group which can
- J-aggregate format is shown below:
- TETHER represents a polypeptide capable of being cleaved by a protease
- the tether can comprise the following peptide
- polypeptide tethers comprising the sequence:
- caspase-3 enzyme assays other sequences which can be cleaved by the caspase-3 enzyme can also be used. Further, the above techniques can be used.
- tether comprises a peptide
- the enzyme results in a dye containing fragment that is capable of forming a J-
- maximum for the aggregate can be used to provide a signal whose intensity is an
- the quencher conjugated to a tether wherein the tether comprises a segment capable of
- cleavage ofthe tether results in a quencher containing bioconjugate fragment that has
- the plurality of associated fluorescent species can be associated with a
- the target caspase enzyme can be caspase-3 and the segment capable of
- the quencher containing bioconjugate fragment can associate with the fluorescer via
- the fluorescer and the bioconjugate can each have an overall
- the fluorescer can be an anionic conjugate polymer and the quencher
- the bioconjugate can be a bioconjugate represented by the following formula:
- the quencher can be conjugated to the tether through a divalent linker moiety.
- a quencher having a carboxylic acid group such as QS Y7 can be conjugated to the carboxylic acid group of a polypeptide tether using a diamine. Therefore, the divalent linker moiety can be the residue of a diamine.
- diamines include, but are not limited to, diamino alkanes such as 1,2-diaminoethane.
- a kit as set forth above is also provided according to a further embodiment wherein the fluorescer is a virtual polymer comprising an aggregate of donor cyanine dyes and the quencher is an acceptor cyanine dye and wherein the acceptor, when conjugated to the tether, is unable to form an aggregate with the donor cyanine dyes.
- the inability ofthe bioconjugate to form an aggregate with the donor can be the result of charge effects or steric effects.
- the acceptor cyanine dye can be a fluorescent molecule or a non-fluorescent molecule.
- a bioconjugate which includes a tether comprising a segment capable of being cleaved by a caspase enzyme, and a quencher conjugated to the tether.
- the caspase enzyme can be caspase-3 and the segment capable of being cleaved by a caspase enzyme can be the
- the quencher can be a cationic electron or energy transfer quencher.
- the bioconjugate can be a bioconjugate represented by the following formula: D-E-V-D-QSY7' (SEQ ID NO: 7) wherein "QSY7"' represents a quencher moiety represented by the following structure:
- quencher moiety is conjugated to the tether through the ⁇ -carboxylic
- a quencher can be conjugated to the tether through a divalent linker moiety.
- a quencher having a carboxylic acid group such as QSY7 can be conjugated to the carboxylic acid group of a polypeptide tether using a diamine. Therefore, the divalent linker moiety can be the residue of a diamine.
- diamines include, but are not limited to, diamino alkanes such as 1,2-diaminoethane.
- a bioconjugate is
- a fluorescent dye conjugated to a tether wherein the tether
- the fluorescent dye containing fragment is N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N
- the fluorescent dye can be a cyanine dye.
- the containing fragment can be capable of forming a J-aggregate.
- the target enzyme can be a caspase enzyme such as caspase-3.
- the segment capable of being cleaved by the target enzyme can be a caspase enzyme such as caspase-3.
- target enzyme can be the peptide sequence:
- An exemplary bioconjugate has a structure represented by the following formula:
- cyanine represents a cyanine dye moiety and wherein the cyanine dye
- the bioconjugate can have a structure represented
- FIG. 2 An assay of this type is represented in FIG. 2.
- assay buffer is added a sample solution of Caspase-3 enzyme in one well of a 384-
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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EP04786078A EP1646356A2 (en) | 2003-07-18 | 2004-07-19 | Assays for protease enzyme activity |
CA002533309A CA2533309A1 (en) | 2003-07-18 | 2004-07-19 | Assays for protease enzyme activity |
AU2004257869A AU2004257869A1 (en) | 2003-07-18 | 2004-07-19 | Assays for protease enzyme activity |
JP2006521154A JP2006528183A (en) | 2003-07-18 | 2004-07-19 | Assay for protease enzyme activity |
IL173189A IL173189A0 (en) | 2003-07-18 | 2006-01-17 | Assays for protease enzyme activity |
Applications Claiming Priority (2)
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US10/621,311 | 2003-07-18 | ||
US10/621,311 US20050014160A1 (en) | 2003-07-18 | 2003-07-18 | Assays for protease enzyme activity |
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WO2005007119A2 true WO2005007119A2 (en) | 2005-01-27 |
WO2005007119A3 WO2005007119A3 (en) | 2006-03-16 |
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PCT/US2004/023083 WO2005007119A2 (en) | 2003-07-18 | 2004-07-19 | Assays for protease enzyme activity |
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US (1) | US20050014160A1 (en) |
EP (1) | EP1646356A2 (en) |
JP (1) | JP2006528183A (en) |
KR (1) | KR20060113882A (en) |
CN (1) | CN1829803A (en) |
AU (1) | AU2004257869A1 (en) |
CA (1) | CA2533309A1 (en) |
IL (1) | IL173189A0 (en) |
WO (1) | WO2005007119A2 (en) |
Cited By (3)
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WO2007051605A3 (en) * | 2005-10-31 | 2008-04-03 | Forschungszentrum Borstel | Methods for determining the cleavability of substrates |
WO2008104638A2 (en) * | 2007-02-27 | 2008-09-04 | Hidex Oy | Improved homogeneous luminescence bioassay |
KR101016213B1 (en) | 2007-11-20 | 2011-02-25 | 한국과학기술연구원 | A dark quenched fluorogenic sensor for protease imaging, its preparation method, and use thereof |
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US20050147534A1 (en) * | 1998-05-05 | 2005-07-07 | Massachusetts Institute Of Technology | Emissive sensors and devices incorporating these sensors |
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US8198096B2 (en) * | 1998-05-05 | 2012-06-12 | Massachusetts Institute Of Technology | Emissive polymers and devices incorporating these polymers |
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US20140249468A1 (en) | 2011-09-09 | 2014-09-04 | The United States Of America,As Represented By The Secretary, Department Of Health And Human Service | Imaging agents for imaging protease activity and uses thereof |
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- 2004-07-19 AU AU2004257869A patent/AU2004257869A1/en not_active Abandoned
- 2004-07-19 CA CA002533309A patent/CA2533309A1/en not_active Abandoned
- 2004-07-19 JP JP2006521154A patent/JP2006528183A/en not_active Ceased
- 2004-07-19 WO PCT/US2004/023083 patent/WO2005007119A2/en not_active Application Discontinuation
- 2004-07-19 EP EP04786078A patent/EP1646356A2/en not_active Withdrawn
- 2004-07-19 CN CNA2004800207919A patent/CN1829803A/en active Pending
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2006
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US20050014160A1 (en) * | 2003-07-18 | 2005-01-20 | Sriram Kumaraswamy | Assays for protease enzyme activity |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2007051605A3 (en) * | 2005-10-31 | 2008-04-03 | Forschungszentrum Borstel | Methods for determining the cleavability of substrates |
WO2008104638A2 (en) * | 2007-02-27 | 2008-09-04 | Hidex Oy | Improved homogeneous luminescence bioassay |
WO2008104638A3 (en) * | 2007-02-27 | 2008-11-06 | Hidex Oy | Improved homogeneous luminescence bioassay |
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KR101016213B1 (en) | 2007-11-20 | 2011-02-25 | 한국과학기술연구원 | A dark quenched fluorogenic sensor for protease imaging, its preparation method, and use thereof |
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JP2006528183A (en) | 2006-12-14 |
EP1646356A2 (en) | 2006-04-19 |
US20050014160A1 (en) | 2005-01-20 |
CN1829803A (en) | 2006-09-06 |
CA2533309A1 (en) | 2005-01-27 |
IL173189A0 (en) | 2006-06-11 |
AU2004257869A1 (en) | 2005-01-27 |
WO2005007119A3 (en) | 2006-03-16 |
KR20060113882A (en) | 2006-11-03 |
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