WO2011061944A1 - 蛍光免疫測定方法 - Google Patents
蛍光免疫測定方法 Download PDFInfo
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- WO2011061944A1 WO2011061944A1 PCT/JP2010/006809 JP2010006809W WO2011061944A1 WO 2011061944 A1 WO2011061944 A1 WO 2011061944A1 JP 2010006809 W JP2010006809 W JP 2010006809W WO 2011061944 A1 WO2011061944 A1 WO 2011061944A1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/58—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving labelled substances
- G01N33/582—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving labelled substances with fluorescent label
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K49/00—Preparations for testing in vivo
- A61K49/001—Preparation for luminescence or biological staining
- A61K49/0013—Luminescence
- A61K49/0017—Fluorescence in vivo
- A61K49/005—Fluorescence in vivo characterised by the carrier molecule carrying the fluorescent agent
- A61K49/0058—Antibodies
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- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/44—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material not provided for elsewhere, e.g. haptens, metals, DNA, RNA, amino acids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/52—Use of compounds or compositions for colorimetric, spectrophotometric or fluorometric investigation, e.g. use of reagent paper and including single- and multilayer analytical elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/531—Production of immunochemical test materials
- G01N33/532—Production of labelled immunochemicals
- G01N33/533—Production of labelled immunochemicals with fluorescent label
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
- G01N33/6854—Immunoglobulins
- G01N33/6857—Antibody fragments
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
- C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/60—Immunoglobulins specific features characterized by non-natural combinations of immunoglobulin fragments
- C07K2317/62—Immunoglobulins specific features characterized by non-natural combinations of immunoglobulin fragments comprising only variable region components
- C07K2317/622—Single chain antibody (scFv)
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2317/00—Immunoglobulins specific features
- C07K2317/90—Immunoglobulins specific features characterized by (pharmaco)kinetic aspects or by stability of the immunoglobulin
- C07K2317/92—Affinity (KD), association rate (Ka), dissociation rate (Kd) or EC50 value
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
- G01N2021/6439—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" with indicators, stains, dyes, tags, labels, marks
Definitions
- the present invention relates to a novel antigen concentration measurement method that does not require an immobilization step and a washing step, a kit for performing such an antigen concentration measurement method, and the like.
- a mono / polyclonal antibody called a primary antibody is immobilized on a measurement plate, a specimen containing an antigen is poured into the plate, and a reaction is performed for a certain period of time to bind the antibody and the antigen.
- a labeled secondary antibody solution to which a reporter molecule such as an enzyme, a fluorescent dye or a radioisotope is previously bound is poured, reacted for a certain period of time, and the labeled secondary antibody is further bound to the antigen captured by the primary antibody. .
- the excess labeled antibody is removed with a washing solution, and the amount of the reporter molecule bound to the measurement plate is measured by enzyme activity, fluorescence, radioisotope or the like to measure the amount of antigen in the sample.
- the normal sandwich ELISA method requires two types of antibodies with different epitopes.
- a low molecular weight compound is used as an antigen
- a plurality of antibodies that recognize different epitopes are prepared. It is difficult. For this reason, Ueda et al.
- Established a highly accurate immunoassay method for low molecular weight compounds called the open sandwich method using the heavy chain variable region (VH) and light chain variable region (VL) of one type of antibody.
- VH heavy chain variable region
- VL light chain variable region
- a VH region polypeptide and a VL region polypeptide of an antibody that specifically recognizes an antigen are prepared, one polypeptide is labeled with a reporter molecule to form a labeled polypeptide, and the other polypeptide is immobilized on a solid phase.
- An antigen concentration measurement method comprising measuring an amount of a reporter molecule of a labeled polypeptide bound to the immobilized polypeptide by contacting the antigen-containing sample and the labeled polypeptide with the immobilized polypeptide, and immobilizing the immobilized polypeptide to the immobilized polypeptide It is.
- immunoassays there are liquid chromatographic methods as methods for measuring low molecular weight compounds. However, high-precision measuring instruments are required, and the amount of analyte required is large. It takes time and is less versatile.
- the antibody and the antigen are labeled with different fluorescent dyes, and the efficiency of fluorescence resonance energy transfer (FRET) occurring between the fluorescent dyes is improved.
- FRET fluorescence resonance energy transfer
- Immunoassay using the change in efficiency due to quenching as an indicator or a fluorescence immunoassay method that measures the decrease in fluorescence intensity caused by aggregation of labeled antibody and measurement object using an antibody labeled with a fluorescent dye ( Patent Document 3) is known.
- the subject of the present invention is an immunoassay that does not require a solid phase step and a washing step, enables quantitative measurement of a target substance quickly and easily in a liquid phase, and can visualize an antigen. To provide a law.
- the present inventors first tried to establish an antibody / antigen binding activity evaluation system using fluorescence resonance energy transfer (FRET) efficiency as an index, using antibodies VH and VL labeled with different fluorescent dyes.
- FRET fluorescence resonance energy transfer
- an anti-BGP antibody light chain region (CR110-VL) labeled with a fluorescent dye CR110 and an anti-BGP antibody heavy chain region (TAMRA-VH) labeled with a fluorescent dye TAMRA are used, and no antigen is present. Does not cause FRET from CR110 to TAMAR, but in the presence of antigen, VH and VL form a ternary complex via the antigen, and it is expected that FRET from CR110 to TAMRA will be caused.
- CR110-VL and TAMRA-VH or unlabeled VH were incubated with different concentrations of BGP antigen peptide, and changes in the fluorescence intensity of CR110 were analyzed by fluorescence intensity distribution analysis (FIDA).
- FIDA fluorescence intensity distribution analysis
- CR110-VL and TAMRA-VH were reacted, the fluorescence intensity of CR110 decreased depending on the concentration of the BGP antigen peptide. Therefore, CR110-VL and TAMRA-VH were mediated by the antigen peptide. Binding to form a complex, confirming that FRET from CR110 to TAMRA was expected as expected.
- the present inventors tried to establish a new measurement method utilizing the quenching phenomenon (hereinafter, sometimes referred to as “homogenous fluorescent ⁇ based immunoassay ”).
- TAMRA-VH and a different concentration of BGP peptide were reacted in the presence or absence of unlabeled VL, and the fluorescence intensity was measured.
- the fluorescence intensity of TAMRA-VH increased depending on the concentration of BGP peptide, and the ratio of the fluorescence intensity of TAMRA-VH in the presence / absence of VL (+ VL / ⁇ VL) was analyzed.
- the present inventors have mutated VH in which four tryptophans (hereinafter also referred to as Trp or W) present in VH are mutated to phenylalanine (hereinafter also referred to as Phe or F), respectively.
- Trp or W tryptophans
- Phe or F phenylalanine
- the measurement method of the present invention is a method for detecting / measuring the binding between an antigen and the antibodies VL and VH, using the fluorescence intensity of a fluorescent dye labeled with the antibody VL or VH as an index.
- the fluorescent dye is in a quenched state when is not bound, and the quenching of the fluorescent dye is eliminated when the antibodies VL and VH are bound via an antigen.
- the solid phase immobilization step and the washing step which are indispensable in the conventional immunoassay method, are not required, measurement results with little variation and high accuracy can be obtained in a short time.
- the present invention comprises (1) an antibody light chain variable region polypeptide and an antibody heavy chain variable region polypeptide, wherein either the antibody light chain variable region polypeptide or the antibody heavy chain variable region polypeptide is a fluorescent dye.
- the present invention relates to an antigen concentration measurement / detection kit.
- the present invention also provides the antigen concentration measurement / detection kit according to (1) or (2), wherein the fluorescent dye is a rhodamine fluorescent dye or an oxazine fluorescent dye,
- Peptide relates antigen concentration measurement and detection kit according to any one of the above (1) to (4), characterized in that it comprises a polypeptide consisting of the amino acid sequence shown in SEQ ID NO: 7.
- the present invention further provides (7) (a) an antibody heavy chain variable region polypeptide labeled with an antibody light chain variable region polypeptide and a fluorescent dye, or an antibody labeled with an antibody heavy chain variable region polypeptide and a fluorescent dye. (A1) contacting a light chain variable region polypeptide with an antigen in a test substance in a liquid phase; or (a2) antibody heavy chain variable labeled with an antibody light chain variable region polypeptide and a fluorescent dye.
- the present invention also provides (8) a method for measuring and detecting an antigen concentration according to (7) above, which is a single-chain antibody in which an antibody heavy chain variable region polypeptide and an antibody light chain variable region polypeptide are bound.
- the antigen concentration measurement / detection method according to (7) or (8) above wherein the fluorescent dye is a rhodamine fluorescent dye or an oxazine fluorescent dye;
- the antigen concentration measurement / detection method according to (9) above which is CR110, TAMRA, or ATTO655, or (11) a polypeptide comprising the antibody heavy chain variable region polypeptide having the amino acid sequence shown in SEQ ID NO: 1
- the antibody light chain variable region polypeptide comprises a polypeptide consisting of the amino acid sequence shown in SEQ ID NO: 2.
- An antigen concentration measurement / detection method and (12) an antibody heavy chain variable region polypeptide comprising a polypeptide comprising the amino acid sequence represented by SEQ ID NO: 6, wherein the antibody light chain variable region polypeptide is represented by SEQ ID NO: 7
- CR110-labeled anti-BGP antibody light chain variable region polypeptide (CR110-VL), TAMRA-labeled anti-BGP antibody heavy chain variable region polypeptide (TAMRA-VH) of the present invention, and complexes thereof (CR110-VL / TAMRA- It is the figure which showed typically VH). It is a figure which shows the result of having reacted with CR110-VL and TAMRA-VH in presence of a BGP peptide of a different density
- CR110-labeled anti-BGP antibody light chain variable region polypeptide of the present invention and the TAMRA-labeled anti-BGP antibody heavy chain variable region polypeptide are reacted in the presence of different concentrations of BGP peptide, and a 488 nm laser and a 510 to 560 nm fluorescent filter are used. It is a figure which shows the result analyzed using the fluorescence intensity distribution analysis method (FIDA).
- FIDA fluorescence intensity distribution analysis method
- CR110-VL represents CR110-labeled anti-BGP antibody light chain variable region polypeptide
- TAMRA-VH represents TAMRA-labeled anti-BGP antibody heavy chain variable region polypeptide, w. t.
- -VH represents an unlabeled anti-BGP antibody heavy chain variable region polypeptide, respectively.
- the CR110-labeled anti-BGP antibody light chain variable region polypeptide of the present invention and the TAMRA-labeled anti-BGP antibody heavy chain variable region polypeptide are reacted in the presence of different concentrations of BGP peptide, and a 543 nm laser and a 560 to 620 nm fluorescent filter are used. It is a figure which shows the result analyzed using the fluorescence intensity distribution analysis method (FIDA).
- FIDA fluorescence intensity distribution analysis method
- CR110-VL represents CR110-labeled anti-BGP antibody light chain variable region polypeptide
- TAMRA-VH represents TAMRA-labeled anti-BGP antibody heavy chain variable region polypeptide
- w. t. -VL indicates an unlabeled anti-BGP antibody light chain variable region polypeptide.
- the TAMRA-labeled anti-BGP antibody heavy chain variable region polypeptide of the present invention is reacted with different concentrations of BGP peptide in the presence or absence of an unlabeled anti-BGP antibody light chain variable region polypeptide to obtain 543 nm He It is a figure which shows the result of having measured fluorescence intensity using -Ne laser.
- + VL represents the reaction result in the presence of an unlabeled anti-BGP antibody light chain variable region polypeptide
- ⁇ VL represents the reaction in the absence of an unlabeled anti-BGP antibody light chain variable region polypeptide.
- the results of measuring the fluorescence intensity are shown respectively.
- the TAMRA-labeled anti-BGP antibody heavy chain variable region polypeptide of the present invention is reacted with different concentrations of BGP peptide in the presence or absence of unlabeled anti-BGP antibody light chain variable region polypeptide, It is a figure which shows the result of having analyzed ratio (+ VL / -VL).
- FIG. 2 is a diagram showing a schematic diagram of a one-dimensional structure of a fluorescently labeled single chain antibody in which a fluorescently labeled antibody heavy chain variable region polypeptide and an antibody light chain variable region polypeptide of the present invention are bound. It is a figure which shows the result of having reacted the ATTO655 labeled anti-BGP single chain antibody with or without a spacer and a different concentration of BGP peptide, and measuring the fluorescence intensity. It is a figure which shows the ratio of the fluorescence intensity measured by making the ATTO655 labeled anti-BGP single chain antibody with or without a spacer react with a different concentration of BGP peptide.
- FL92 represents a spacer sequence composed of the amino acid sequence shown in SEQ ID NO: 3
- 2TAG represents a spacer sequence composed of MX (X is a fluorescently labeled amino acid).
- FL92 represents a spacer sequence composed of the amino acid sequence shown in SEQ ID NO: 3
- 2TAG represents a spacer sequence composed of MX (X is a fluorescently labeled amino acid).
- FL92 represents a spacer sequence composed of the amino acid sequence shown in SEQ ID NO: 3
- 2TAG represents a spacer sequence composed of MX (X is a fluorescently labeled amino acid).
- a fluorescent-labeled anti-BGP single chain antibody containing an FL92 spacer (SEQ ID NO: 3) is reacted with a different concentration of BGP peptide to obtain a fluorescence image analyzer (FMBIO-III; manufactured by Hitachi Software Engineering) and MF20 / FluoroPoint-Light (Olympus). It is a figure which shows ratio of the fluorescence intensity measured using the company make. It is a figure which shows the result of having reacted TAMRA labeled anti-BGP single chain antibody with or without a spacer and a different concentration of BGP peptide and detecting fluorescence.
- FMBIO-III fluorescence image analyzer
- MF20 / FluoroPoint-Light FluoroPoint-Light
- G3S (1) indicates GGGS
- G3S (2) indicates GGGSGGGGS (SEQ ID NO: 4)
- G3S (3) indicates a spacer (linker) sequence of GGGSGGGSGGGS (SEQ ID NO: 10).
- the ATTO655-labeled anti-bisphenol A (BPA) antibody heavy chain variable region polypeptide of the present invention and different concentrations of BPA are reacted in the presence or absence of unlabeled anti-BPA antibody light chain variable region polypeptide to obtain fluorescence intensity.
- BPA bisphenol A
- G3S (2) includes GGGSGGGGS (SEQ ID NO: 4)
- G3S (3) includes GGGSGGGSGGGGS (SEQ ID NO: 10)
- G3S (5) includes a spacer (linker) sequence of GGGSGGGSGGGSGGGS (SEQ ID NO: 11). Show. It is a figure which shows the result of having reacted TAMRA label
- Trp106 in the amino acid sequence of VH corresponds to the 103rd position in the Kabat numbering system.
- the antigen concentration measurement / detection kit of the present invention comprises an antibody light chain variable region polypeptide and an antibody heavy chain variable region polypeptide, and any of the antibody light chain variable region polypeptide and the antibody heavy chain variable region polypeptide.
- Either one is a kit labeled with a fluorescent dye, and it is possible to measure the antigen concentration or visualize the antigen using the positive correlation between the concentration of the antigen in the liquid phase and the fluorescence intensity of the fluorescent dye.
- a kit for antigen concentration measurement / detection characterized by: (1) a kit comprising an antibody light chain variable region polypeptide and an antibody heavy chain variable region polypeptide labeled with a fluorescent dye An antigen concentration measurement kit capable of measuring the antigen concentration using as an indicator that the antigen concentration in the liquid phase and the fluorescence intensity of the fluorescent dye have a positive correlation; (2) A kit comprising a light chain variable region polypeptide and an antibody heavy chain variable region polypeptide labeled with a fluorescent dye, wherein the amount of antigen in the test subject and the fluorescence intensity of the fluorescent dye are positively correlated An antigen detection kit capable of visualizing an antigen using the relationship as an index, and (3) a kit comprising an antibody heavy chain variable region polypeptide and an antibody light chain variable region polypeptide labeled with a fluorescent dye An antigen concentration measurement kit capable of measuring the antigen concentration using as an indicator that the antigen concentration in the liquid phase and the fluorescence intensity of the fluorescent dye are positively correlated, and (4) antibody weight A kit comprising a chain variable
- the antigen is not particularly limited as long as it is an antigen specifically recognized by the antibody heavy chain variable region polypeptide and the antibody light chain variable region polypeptide.
- proteins, peptides, carbohydrates, lipids , Glycolipids, low molecular weight compounds and the like are examples of proteins, peptides, carbohydrates, lipids , Glycolipids, low molecular weight compounds and the like.
- the antigen concentration measurement / detection method of the present invention includes (a) an antibody heavy chain variable region polypeptide labeled with an antibody light chain variable region polypeptide and a fluorescent dye, or an antibody heavy chain variable region polypeptide and a fluorescent dye. (A1) contacting a labeled antibody light chain variable region polypeptide with an antigen in a test substance in a liquid phase; or (a2) an antibody labeled with an antibody light chain variable region polypeptide and a fluorescent dye.
- measurement method [I] a method for measuring an antigen concentration
- a step of contacting a region polypeptide and an antibody light chain variable region polypeptide labeled with a fluorescent dye with an antigen in a test substance (a1-2); a step of measuring the fluorescence intensity of the fluorescent dye (b)
- measurement method [II] an antigen concentration method
- Antibody heavy chain variable region polypeptide (A2-1); (b) detecting the fluorescence of the fluorescent dye; (c) the amount of antigen in the test non-human animal subject and the step An antigen detection method (hereinafter referred to as “non-human animal detection”) comprising sequentially visualizing an antigen contained in a test subject using as an index that the fluorescence intensity of the fluorescent dye has a positive correlation Method [I] ”), or a step of contacting an antigen in a test non-human animal subject to which an antibody heavy chain variable region polypeptide and an antibody light chain variable region polypeptide labeled with a fluorescent dye are administered ( a2-2); detecting the fluorescence of the fluorescent dye (b); using as an index that the amount of antigen in the subject non-human animal subject and the fluorescence intensity of the fluorescent dye have a positive correlation Visualization of antigens contained in the test object (C); an antigen detection method (hereinafter sometimes referred to as “non-human animal detection method [II]”), or an in
- an antigen detection method (hereinafter, “ In vitro detection method [I] ”or in vitro contact of an antibody heavy chain variable region polypeptide and an antibody light chain variable region polypeptide labeled with a fluorescent dye with an antigen in a test subject Step (a3 2); the step of detecting the fluorescence of the fluorescent dye (b); the amount of antigen in the test object and the fluorescence intensity of the fluorescent dye are included in the test object, using as an indicator that there is a positive correlation
- the antibody light chain variable region is not particularly limited as long as it is an antigen detection method (hereinafter sometimes referred to as “in vitro detection method [II]”), which comprises
- the polypeptide and the antibody heavy chain variable region polypeptide may be prepared as two independent polypeptide fragments as long as they can form a complex via the same antigen molecule. It may also be prepared as a single chain antibody fused via a linker or the like.
- the antigen is not particularly limited as long as it is an antigen specifically recognized by the antibody heavy chain variable region polypeptide and the antibody light chain variable region polypeptide.
- proteins, peptides, carbohydrates, lipids , Glycolipids, low molecular weight compounds and the like are examples of proteins, peptides, carbohydrates, lipids , Glycolipids, low molecular weight compounds and the like.
- the antibody heavy chain variable region polypeptide is not particularly limited as long as it contains an amino acid sequence specific to the antibody heavy chain variable region encoded by exons of the V region, D region, and J region of the antibody heavy chain gene.
- an arbitrary amino acid sequence may be further added to the N-terminal and / or C-terminal side of the amino acid sequence specific to the antibody heavy chain variable region.
- the amino acid sequence specific for the antibody heavy chain variable region is an amino acid sequence in which the 36th, 47th, or 103rd amino acid is tryptophan in the Kabat numbering system.
- specific examples include the amino acid sequence shown in SEQ ID NO: 1 and the amino acid sequence shown in SEQ ID NO: 6.
- the antibody light chain variable region polypeptide is not particularly limited as long as it contains an amino acid sequence specific to the antibody light chain variable region encoded by exons of the V region and J region of the antibody light chain gene.
- an arbitrary amino acid sequence may be added to the N-terminal and / or C-terminal side of the amino acid sequence specific to the antibody light chain variable region.
- the amino acid sequence specific to the antibody light chain variable region is preferably an amino acid sequence in which the 35th amino acid is tryptophan in the Kabat numbering system.
- the amino acid sequence shown in 2 and the amino acid sequence shown in SEQ ID NO: 7 can be preferably exemplified.
- Antibody light chain variable region polypeptides, antibody light chain variable region polypeptides, and single chain antibody polypeptides comprising both antibody light chain variable regions and antibody light chain variable regions are known chemical synthesis methods, genetic recombination Although it can be prepared using a technique, a method for degrading antibody molecules with a proteolytic enzyme, etc., among them, it is preferable to prepare by a gene recombination technique that can be prepared in a large amount by a relatively easy operation.
- the desired polypeptide can be expressed by an expression system using bacteria, yeast, insects, animal or plant cells as a host, or a cell-free translation system.
- a cell-free translation system for example, in a reaction solution in which nucleotide triphosphate and various amino acids are added to a cell-free extract such as Escherichia coli, wheat germ, rabbit reticulocyte, etc., the polypeptide is used. Can be expressed.
- the fluorescent dye is not particularly limited as long as it is quenched (quenched) in a state labeled with the antibody heavy chain variable region polypeptide or antibody light chain variable region polypeptide.
- Rhodamine, coumarin, Cy, EvoBlue examples thereof include fluorescent dyes having a basic skeleton such as oxazine, Carbopyronin, naphthalene, biphenyl, anthracene, phenenthrene, pyrene, carbazole, and derivatives of the fluorescent dyes.
- CR110 carboxyrhodamine 110: Rhodamine Green Name
- TAMRA carbocytetremethlrhodamine: TMR
- ATTO655 trade name
- BODIPY FL trade name: 4,4-difluoro-5,7-dimethyl-4-bora-3a, 4a-diaza-s-indancene-3- propionic acid
- BODIPY 493/503 trade name: 4,4-difluoro-1,3,5,7-tetramethyl-4-bora-3a, 4a-diaza-s-indancene-8-propionicacid
- BODIPY R6G (trademark) Name): 4,4-difluo ro-5- (4-phenyl-1,3-butadienyl) -4-bora-3a, 4a-diaza-s-indancene-3-propionic acid
- BODIPY 558/568 trade name: 4,4-difluoro-
- the method for labeling the antibody light chain variable region polypeptide and the antibody heavy chain variable region polypeptide with a fluorescent dye is not particularly limited, and is used directly or via a cross-linking agent using functional groups at both ends or side chains of the polypeptide.
- Indirect labeling methods site-specific labeling methods while synthesizing polypeptides using an in vitro transcription / translation system, and the like can be used.
- Examples of labeling methods using an in vitro transcription / translation system include an amber suppression method (Ellman J et al. (1991) Methods Enzymol. 202: 301-36), and a C-terminal labeling method (Japanese Patent Laid-Open No. 2000-139468). ), N-terminal labeling method (US Pat. No.
- the amino acid at the target site of the label is known.
- a DNA or mRNA in which the codon encoding is replaced with an amber codon, which is one of the stop codons, is prepared, and a protein is synthesized from the DNA or mRNA using an in vitro transcription / translation system.
- a suppressor tRNA to which a labeled unnatural amino acid is bound is added to the protein synthesis reaction solution, a protein in which the labeled amino acid is introduced at the site substituted with the amber codon can be synthesized.
- a protein in which a label is specifically introduced by translating DNA or mRNA into protein in an in vitro transcription / translation system to which labeled puromycin is added at an optimal concentration. Can be synthesized.
- the antigen concentration measurement / detection kit of the present invention may contain reagents and instruments usually used in this type of immunoassay kit, such as a buffer, a measurement tube or plate, and an antigen that can be used as a standard substance. .
- reagents and instruments usually used in this type of immunoassay kit such as a buffer, a measurement tube or plate, and an antigen that can be used as a standard substance.
- Such an antigen concentration measurement / detection kit of the present invention can be suitably used for the antigen concentration measurement / detection method of the present invention.
- the antibody heavy chain variable region polypeptide labeled with an antibody light chain variable region polypeptide and a fluorescent dye in a solution such as a buffer solution or physiological saline In the step (a1-1) in the measurement method [I] of the present invention, the antibody heavy chain variable region polypeptide labeled with an antibody light chain variable region polypeptide and a fluorescent dye in a solution such as a buffer solution or physiological saline. Antigen specifically recognized by antibody heavy chain variable region polypeptide / antibody labeled with antibody light chain variable region polypeptide / fluorescent dye in solution after adding each of the peptides and incubating with test substance To form a tripartite complex consisting of In the step (a1-2) in the above measurement method [II], the antibody light chain variable region polypeptide labeled with the antibody heavy chain variable region polypeptide and the fluorescent dye in a solution such as a buffer solution or physiological saline.
- test substance After each addition, the test substance is added and incubated, and the antigen specifically recognized by the antibody light chain variable region polypeptide / antibody labeled with the antibody heavy chain variable region polypeptide / fluorescent dye in solution
- test substance include serum, plasma, saliva, urine and other body fluids that may contain the target antigen to be measured, culture supernatant, cell extract, fungus body extract, and industrial wastewater.
- the incubation conditions are not particularly limited as long as they can be generally used for antibody-antigen reaction.
- the temperature conditions are, for example, 1 to 30 ° C., preferably 18 to 25 ° C., and the reaction time is, for example, The time can be 5 to 180 minutes, preferably 60 to 120 minutes.
- the solution after completion of the incubation can be directly used for the following step (b) without undergoing a step such as washing. This is one of the major features of the antigen concentration measurement / detection method of the present invention.
- the solution prepared in the step (a1-1) or (a1-2) is irradiated with excitation light in the solution.
- the fluorescence intensity of the fluorescent dye can be measured.
- the fluorescence measuring apparatus used for the measurement is not particularly limited, and preferred examples include MF20 / FluoroPoint-Light (Olympus) and FMBIO-III (Hitachi Software Engineering).
- the amount of antigen contained in the test substance is calculated from the measured fluorescence intensity obtained in the step (b). be able to. That is, since the antigen concentration in the solution prepared by the above step (a1-1) or (a1-2) and the fluorescence intensity measured by the step (b) are positively correlated, A standard curve showing the relationship between antigen concentration and fluorescence intensity is measured by measuring the fluorescence intensity when using a test substance containing, and when using a test substance containing an antigen of unknown concentration from this standard curve By calculating the antigen concentration corresponding to the measured value of the fluorescence intensity, the amount of antigen contained in the test substance can be determined. Further, “calculating the antigen amount” in the step (c) includes a case where the antigen amount is automatically calculated by a conversion equation or the like set in advance based on a standard curve.
- the antibody light chain variable region polypeptide and the antibody heavy chain variable region polypeptide labeled with a fluorescent dye are used as the test non-human animal.
- a ternary complex consisting of an antigen that is administered to a subject and specifically recognized by the antibody heavy chain variable region polypeptide / antibody labeled with the antibody light chain variable region polypeptide / fluorescent dye in the subject non-human animal subject To form.
- the antibody heavy chain variable region polypeptide and the antibody light chain variable region polypeptide labeled with a fluorescent dye are coated systemically or locally.
- Consisting of an antigen that is administered to a test non-human animal subject and that is specifically recognized by the antibody light chain variable region polypeptide / antibody labeled with the antibody heavy chain variable region polypeptide / fluorescent dye in the test non-human animal subject A tripartite complex is formed.
- the subject non-human animal subject is not particularly limited as long as it is an animal other than a human, and examples thereof include mice, rats, hamsters, monkeys, pigs and the like.
- the “administration” method is appropriately selected from parenteral local administration methods such as intramuscular injection, intraperitoneal injection, intravenous injection, subcutaneous injection, implantation, and application, and oral administration methods. Can do.
- step (b) of the non-human animal detection method [I] or non-human animal detection method [II] of the present invention either one of the steps (a2-1) and (a2-2) is a fluorescent dye.
- a fluorescent dye Non-invasively detecting the fluorescence of the fluorescent dye in the subject non-human animal administered with the antibody light chain variable region polypeptide and antibody heavy chain variable region polypeptide labeled with Fluorescence of a fluorescent dye in a tissue or cell collected from a non-human animal subject is detected.
- the “detecting” method is not particularly limited as long as it can detect the fluorescence of the fluorescent dye two-dimensionally or three-dimensionally by irradiating the individual, tissue, or cell of the subject non-human animal subject with excitation light. Is not to be done.
- an image showing the structure of an individual, tissue, or cell of a non-human animal subject to be examined is simultaneously created using an endoscope, X-ray, CT, MRI, ultrasound, a microscope, or the like. It is preferable.
- a test is performed based on the result of detecting the fluorescence of the fluorescent dye obtained in the step (b).
- Visualize antigens in non-human animal subjects That is, since the amount of antigen in the test non-human animal subject and the fluorescence intensity of the fluorescence detected in step (b) are positively correlated, the structure of the individual, tissue, or cell of the test non-human animal subject Is compared with the two-dimensional or three-dimensional image of the fluorescence detected in the step (b), whereby the localization (position) of the antigen can be known.
- a visible light image is created by irradiating a tissue of a subject non-human animal with visible light, and one of the tissues is labeled.
- a fluorescent image is created by irradiating excitation light to the labeled fluorescent dye, and the above-mentioned visible light image and fluorescent image To know the localization of the antigen in the tissue.
- step (a3-1) of the above in vitro detection method [I] of the present invention in vitro, the antibody heavy chain variable region polypeptide labeled with the antibody light chain variable region polypeptide and the fluorescent dye, and the test subject to form a ternary complex consisting of an antibody light chain variable region polypeptide / antibody specifically recognized by an antibody heavy chain variable region polypeptide / antibody labeled with a fluorescent dye.
- the test subject in addition to cultured cells, tissue sections, tissues or cells collected from living bodies that may contain the target antigen to be measured, cell extraction blotted on nitrocellulose membrane, PVDF membrane, etc. A liquid etc. can be mentioned.
- the incubation conditions are not particularly limited as long as they are conditions generally used for antibody-antigen reactions.
- the temperature conditions are, for example, 1 to 30 ° C., preferably 18 to 25 ° C., and the reaction time is For example, it can be 5 to 180 minutes, preferably 60 to 120 minutes.
- the solution after completion of the incubation can be directly used for the following step (b) without undergoing a step such as washing. This is one of the major features of the antigen concentration measurement / detection method of the present invention.
- step (b) of the in vitro detection method [I] and the in vitro detection method [II] either one of the steps (a3-1) and (a3-2) is labeled with an antibody light chain.
- the fluorescence of the fluorescent dye in the test subject incubated with the variable region polypeptide and the antibody heavy chain variable region polypeptide is detected two-dimensionally or three-dimensionally.
- Examples of the “detecting” method include a fluorescence microscope and a fluorescence image analyzer.
- step (c) of the in vitro detection method [I] or in vitro detection method [II] the antigen in the test subject is visualized from the result of detecting the fluorescence of the fluorescent dye obtained in the step (b). Can do. That is, since the antigen amount in the test subject and the fluorescence intensity of the fluorescence detected in the step (b) are positively correlated, the two-dimensional or three-dimensional image of the fluorescence detected in the step (b) Based on this, the localization (position) of the antigen can be known.
- FIG. 1 shows CR110-labeled anti-BGP antibody light chain variable region polypeptide (CR110-VL), TAMRA-labeled anti-BGP antibody heavy chain variable region polypeptide (TAMRA-VH), and complexes thereof (CR110-VL / TAMRA).
- -VH CR110-labeled anti-BGP antibody light chain variable region polypeptide
- -VH complexes thereof
- mutant VL (W33F, W36F, W47F, W106F) expression vectors in which four tryptophan codons (TGG; Trp33, Trp36, Trp47, Trp106) contained in the VH gene are replaced with phenylalanine codons (TTT), ProXtag and VH
- Fluorescently labeled aminoacyl-tRNAs (TAMRA-X-AF-tRNAamber, CR110-X-AF-tRNAamber, and ATTO655-X-AF-tRNAamber) for producing fluorescently labeled proteins are CloverDirect TM tRNA Reagents for Site-Derected Protein Functionalization (manufactured by Protein Express) was used. The reaction solution was reacted at 20 ° C., 600 rpm, 2 h, and further reacted at 4 ° C., 16 h.
- the synthesized V region protein was purified by His-Spin Trap Column (manufactured by GE Healthcare). To the above reaction solution (50 ⁇ L), add Wash buffer (20 mM Phosphate buffer (pH 7.4) /0.5 M NaCl / 60 mM imidazole / 0.1% Polyoxyethylene (23) Lauryl® Ether) to 400 ⁇ L, and put it into His-Spin® Trap column. Applied. After incubating at room temperature for 15 minutes, washing was performed 3 times with a Wash buffer.
- the excitation wavelength was set to 490 nm for a mixture of CR110-VL and TAMRA-VH and 550 nm for TAMRA-VH.
- the fluorescence intensity ratio I A / ID was calculated for a mixture of CR110-VL and TAMRA-VH.
- I A and I D was used as the fluorescent intensity at 575nm and 525nm, respectively.
- the dissociation constant (Kd) value was calculated by the fluorescence intensity ratio (I A / ID ) or curve fitting of the fluorescence intensity at the maximum fluorescence wavelength.
- a sigmoidal dose-response model of Graphpad Prism manufactured by Graphpad
- FIG. 2 shows the change in fluorescence intensity at 525 nm and 575 nm.
- FIG. 3 shows the results of analyzing the change in the fluorescence intensity ratio (F575 / F525) at 525 nm and 575 nm, respectively.
- TAMRA-labeled anti-BGP antibody scFv protein (2 ⁇ g / mL, 25 ⁇ L) with or without a spacer and antigenic BGP peptide so as to be a total of 200 ⁇ L of PBS (+ 0.05% Tween 20, 0.2% BSA) Samples were prepared. Thereafter, the sample was allowed to stand at 25 ° C. for 70 minutes, and then the fluorescence spectrum was measured using a fluorescence spectrophotometer (FluoroMax-4; manufactured by Horiba Joban Yvon), and the fluorescence intensity was calculated by curve fitting.
- FluoroMax-4 fluorescence spectrophotometer
- a sigmoidal dose-response model of ImageJ software http://rsbweb.nih.gov/ij/ was used as statistical analysis software. Measurement was performed at an excitation wavelength of 550 nm and a measurement wavelength of 580 nm.
- fluorescence intensity distribution analysis method The fluorescence-labeled VH protein and the fluorescence-labeled VL protein (1 ⁇ g / mL and 7.5 ⁇ L, respectively) prepared in Example 1 or the fluorescence-labeled scFv (1 ⁇ g / mL and 7.5 ⁇ L) were added to PBS (+0.05) together with the BGP peptide. % Tween 20) to 50 ⁇ L, added to 384-well Glass Bottom Microplate (Olympus), and incubated at 25 ° C. for 90 minutes. The measurement by the fluorescence intensity distribution analysis method (Fluorescence Intensity Multiple Distribution Analysis; FIDA) was performed at 25 ° C.
- FIDA Fluorescence Intensity Multiple Distribution Analysis
- TAMRA and ATTO655 were excited with 543 nm and 633 nm lasers, respectively. Data was acquired for 10 seconds in one measurement, and 10 measurements were performed on one sample. An average value and a standard deviation were calculated from the measured values.
- VL acts as a quencher for CR110, and when CR110-VL is present alone, the fluorescence of CR110 is quenched by VL, but CR110-VL, VH and antigen peptide are It was speculated that this quenching effect could be eliminated when a tripartite complex was formed.
- TAMRA-VH and CR110-VL or unlabeled VL were incubated with different concentrations of BGP antigen peptide (1 to 10,000 ng), and changes in TAMRA fluorescence intensity were measured by fluorescence intensity distribution analysis (FIDA). Analyzed. Measurement was performed using a 543 nm laser as excitation light and a 560 to 620 nm fluorescent filter. The results are shown in FIG. When TAMRA-VH and CR110-VL were reacted, the fluorescence intensity of TAMRA increased in a BGP antigen peptide concentration-dependent manner.
- FIG. 7 shows the results of measurement of fluorescence intensity using TAMRA-VH and a different concentration of BGP peptide in the presence or absence of unlabeled VL and using a 543 nm He—Ne laser.
- VL the fluorescence intensity of TAMRA-VH
- the fluorescence intensity of TAMRA-VH increased in a BGP peptide concentration-dependent manner.
- the fluorescence intensity of TAMRA-VH remained low when any concentration of BGP peptide was reacted.
- TAMRA is a rhodamine dye
- studies so far have reported that rhodamine dyes are quenched (quenched) by amino acids such as tryptophan (Trp). Therefore, the inventors presume that the Trp residue present in VH is involved in TAMRA quenching, and when TAMRA-VH is present alone, TAMRA fluorescence is present in the vicinity thereof.
- Trp residue has four Trp residues (Trp33, Trp36, Trp47, Trp106).
- Trp33, Trp36, and Trp106 are involved in hydrophobic interaction with VL, and Trp33 is involved in interaction with BGP peptide.
- Trp33 is involved in interaction with BGP peptide.
- Wild type or mutant anti-BGP antibody heavy chain variable region polypeptide (W33F, W36F, W47F, W106F) and VL are reacted in the presence of different concentrations of BGP peptide, and fluorescence intensity is measured using a 543 nm He-Ne laser. Was measured. The results are shown in FIG. As a result of measuring the fluorescence intensity of the mutant fluorescently labeled VH alone, W106F and W36F showed an increase in fluorescence of 31% and 29%, respectively, as compared to the wild type (WT). W47F showed an 11% increase in fluorescence. On the other hand, W33F showed a 9% decrease.
- Trp36, Trp47, and Trp106 are mainly involved in the fluorescence quenching of TAMRA.
- W33F, W36F, and W106F exhibited an antigen concentration-dependent increase in fluorescence that was 1.5-fold, 1.3-fold, and 1.5-fold when reacted with VL and BGP peptides, respectively.
- Trp to Phe mutation reduced the resolution of antigen-dependent quenching suggest that Trp33, Trp36, and Trp106 are partially involved in the quench.
- W47F was reacted with the BGP peptide and VL, no increase in fluorescence was observed.
- the analysis result of diffusion time by FCS measurement (FIG. 11) shows that the binding activity of the antibody disappears due to the mutation of Trp47. Therefore, Trp47 of VH is essential for the binding of the antibody and the antigen. It was shown that.
- Trp33 and Trp106 are important Trps for quenching from the two points of an increase in fluorescence of the fluorescence-labeled VH alone and a decrease in the increase in fluorescence depending on the antigen concentration.
- Trp47 is not known to be involved in antigen concentration-dependent quenching, but has been found to be a very important site for complex formation of VH and VL via antigen.
- Trp106 in the amino acid sequence of VH corresponds to the 103rd position in the Kabat numbering system. (Kabat, E. et al., "Sequences of proteins of immunological interest, 5th edn.," U. S. Department of Health and Human Service, Public Service, National Institute of Health, DC, 1991.)
- ATTO655-VH (+ spacer) was prepared by adding GGGSGGGS (SEQ ID NO: 4) as a spacer between ATTO655 and VH, and the influence of the presence or absence of the spacer on the quenching effect was examined.
- FIG. 12 shows a complex of fluorescently labeled anti-BGP antibody heavy chain variable region polypeptide (Fluorescent labeled BGP-VH) and anti-BGP antibody light chain variable region polypeptide (BGP-VL) (Fluorescent labeled BGP-VH / VL) shows a three-dimensional structure prediction model.
- FIG. 15 shows a three-dimensional structure prediction model of a fluorescent-labeled single-chain antibody in which a fluorescent-labeled antibody heavy chain variable region polypeptide and an antibody light-chain variable region polypeptide of the present invention are bound.
- ProX TM tag (MSKQIEVNXSNET (X is a fluorescently labeled amino acid); SEQ ID NO: 3) containing an amber codon at the N-terminus of the inserted VH is added, and His-tag is added at the C-terminus. Designed. Similarly, a DNA sequence in which the amino acid X of the N-terminal ProX TM tag is substituted with F is added to the gene encoding the anti-BPA antibody VL (SEQ ID NO: 7), and the pIVEX 2.3d vector (Roche Diagnostics) is added. (Styx) NcoI and HindIII sites.
- the constructed expression vector is designed such that a sequence in which the amino acid X of the inserted VL N-terminal ProX TM tag is substituted with F is added with His-tag at the C-terminal.
- a single chain antibody (scFv) expression vector in which a VH gene and a VL gene are linked by a linker (GGGGSGGGGSGGGGS; SEQ ID NO: 9), a spacer (GGGSGGGS; SEQ ID NO: 4) between the ProX TM tag and the scFv N-terminus.
- GGGSGGGSGGGS; SEQ ID NO: 10 or GGGSGGGSGGGSGGGSGGGS; SEQ ID NO: 11) were also produced in combination with three types of single chain antibody (scFv) expression vectors.
- CloverDirect TM tRNA Reagents for Site-Derected Protein Functionalization (manufactured by Protein Express) was used as ATTO655-X-AF-tRNAamber for preparing fluorescently labeled proteins.
- the reaction solution was reacted at 20 ° C., 600 rpm, 2 hours, and then reacted at 4 ° C., 16 hours.
- SDS-PAGE (15%) was performed using 1 ⁇ L of the reaction solution, and protein expression was observed with a fluorescence image analyzer (FMBIO-III; manufactured by Hitachi Software Engineering Co., Ltd.).
- FMBIO-III fluorescence image analyzer
- Western blotting was performed using a His-tag antibody, and it was confirmed that the target protein was synthesized.
- the synthesized V region protein was purified using His Spin Trap Column (manufactured by GE Healthcare).
- Wash buffer (20 mM Phosphate buffer (pH 7.4) /0.5 M NaCl / 60 mM imidazole / 0.1% Polyoxyethylene (23) Lauryl® Ether) is added to 400 ⁇ L, and His-Spin® Trap. Applied to Column. After 15 minutes of incubation at room temperature, washing was performed 3 times with Wash buffer.
- a sigmoidal dose-response model of Graphpad Prism (manufactured by Graphpad) was used as statistical analysis software.
- TAMRA-labeled anti-BPA antibody scFv protein (2 ⁇ g / mL, 25 ⁇ L) with or without a spacer and antigen BPA in a total of 200 ⁇ L of PBS (+ 0.05% Tween 20, 0.2% BSA, 1% MeOH) Samples were prepared so that Thereafter, the sample was allowed to stand at 25 ° C.
- each single chain antibody is as follows; anti-hen egg lysozyme (HEL) antibody scFv is a linker sequence of anti-HEL antibody VH (SEQ ID NO: 12) and VL (SEQ ID NO: 13) sequentially. (GGGGSGGGGSGGGGS; SEQ ID NO: 9); Estradiol (estradiol) antibody scFv is obtained by sequentially binding VH (SEQ ID NO: 14) and VL (SEQ ID NO: 15) of anti-estradiol antibodies with a linker sequence (GGGGSGGGGSGGGS; SEQ ID NO: 9).
- the SA (Serum Albumin) antibody scFv is a sequence in which the anti-SA antibody VH (SEQ ID NO: 16) and VL (SEQ ID NO: 17) are sequentially linked by a linker sequence (GGGGSGGGGSGGGS; SEQ ID NO: 9).
- CloverDirect TM tRNA Reagents for Site-Derected Protein Functionalization (manufactured by Protein Express) was used as a fluorescence-labeled aminoacyl-tRNA (TAMRA-X-AF-tRNAamber) for preparing a fluorescence-labeled protein.
- the reaction solution was reacted at 20 ° C., 600 rpm, 2 h, and further reacted at 4 ° C., 16 h. After completion of the reaction, SDS-PAGE (15%) was performed using 1 ⁇ L of the reaction solution, and protein expression was observed with a fluorescence image analyzer (FMBIO-III; manufactured by Hitachi Software Engineering Co., Ltd.). Further, Western blotting was performed using a His-tag antibody to confirm that the target protein was synthesized.
- FMBIO-III fluorescence image analyzer
- the synthesized V region protein was purified by His-Spin Trap Column (manufactured by GE Healthcare). To the above reaction solution (50 ⁇ L), add Wash buffer (20 mM Phosphate buffer (pH 7.4) /0.5 M NaCl / 60 mM imidazole / 0.1% Polyoxyethylene (23) Lauryl® Ether) to 400 ⁇ L, and put it into His-Spin® Trap column. Applied. After incubating at room temperature for 15 minutes, washing was performed 3 times with a Wash buffer.
- a sample was prepared such that the TAMRA-labeled anti-HEL antibody scFv protein (2 ⁇ g / mL, 25 ⁇ L) and the antigen HEL protein were in a total of 200 ⁇ L of PBS (+ 0.05% Tween 20, 1% BSA).
- a sample was prepared so that the TAMRA-labeled anti-estradiol antibody scFv protein (2 ⁇ g / mL, 25 ⁇ L) and the antigen estradiol total 200 ⁇ L of PBS (+ 0.05% Tween 20, 1% BSA).
- TAMRA-labeled anti-SA antibody scFv protein (2 ⁇ g / mL, 25 ⁇ L) and antigen BSA (bovine serum albumin) or HSA (human serum albumin) in a total of 200 ⁇ L of PBS (+ 0.05% Tween 20, 0.2%
- BSA bovine serum albumin
- HSA human serum albumin
- Trp residues in mouse antibody VH As shown in Example 4, FIG. 9, and Table 1, the quenching of the fluorescent dye labeled with anti-BGP antibody requires Kabat number in the amino acid sequence of VH. It is clear that the 33rd, 36th and 106th Trps play an important role in the attachment system, and that the 47th Trp is essential for the binding of the antibody (VH and VL) to the antigen. (Note that Trp106 in the amino acid sequence of VH corresponds to the 103rd position in the Kabat numbering system). Therefore, whether or not these tryptophan residues are conserved in the mouse antibody VH region other than the anti-BGP antibody was also confirmed.
- the Abysis database (Dr.
- Table 2 shows the results of numbering according to Kabat sequence notation.
- Table 3 shows the results obtained by numbering the numbers according to the Kabat sequence notation.
- the homogeneous fluorescent immunoassay method of the present invention does not require the immobilization or washing of an antibody or antigen, and directly monitors the fluorescence intensity of a mixed solution in which an antibody and a test substance are mixed, thereby concentrating the concentration of the target substance. Therefore, it is expected that low-molecular compounds can be detected more easily and quickly.
- the homogeneous fluorescent immunoassay method of the present invention can be used for measurement of various antigen concentrations.
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Abstract
Description
本発明は、以上の知見に基づき完成するに至ったものである。
(抗BGP抗体V領域遺伝子発現ベクターの構築)
ヒトオステオカルシン(human Bone Gla Protein;BGP)に対する抗体の重鎖可変領域(VH;配列番号1)又は軽鎖可変領域(VL:配列番号2)領域をコードするDNA配列に、N末端にamberコドンを含むProXTMtag(MSKQIEVNXSNET(Xは蛍光標識アミノ酸);配列番号3)のDNA配列を付与した遺伝子を、pIVEX2.3dベクター(ロシュ・ダイアグノスティックス社製)のNcoIとHindIIIサイトへ組み込んだ。この構築した発現ベクターは、挿入したVH又はVLのN末端にProXTMtag(MSKQIEVNXSNET(Xは蛍光標識アミノ酸);配列番号3)が、C末端にHis-tagが、それぞれ付加されるよう設計されている。図1に、CR110標識抗BGP抗体軽鎖可変領域ポリペプチド(CR110-VL)、TAMRA標識抗BGP抗体重鎖可変領域ポリペプチド(TAMRA-VH)、及び、それらの複合体(CR110-VL/TAMRA-VH)を模式的に示す。同様にして、TAGコドンをTTTコドンに置換し、蛍光標識アミノ酸残基をフェニルアラニン残基に置換した野生型VH及びVL発現ベクターを作製した。
RTS100 E.coli Disulfide Kit(ロシュ・ダイアグノスティックス社製)を用いて、無細胞翻訳系によるV領域タンパク質N末端領域への蛍光標識アミノ酸の導入を行った。反応液(50μL)は、7μLのamino acid mix、1μLのMethionine、7μLのReactionmix、25μLのactivated E-coli Lysate、5μLのplasmid DNA(500ng)、5μLの蛍光標識アミノアシル-tRNAamber(0.8nmol)を加えた。蛍光標識タンパク質を作製するための蛍光標識アミノアシル-tRNA(TAMRA-X-AF-tRNAamber,CR110-X-AF-tRNAamber,及びATTO655-X-AF-tRNAamber)は、CloverDirectTM tRNA Reagents for Site-Derected Protein Functionalization(プロテインエクスプレス社製)を用いた。反応液は、20℃,600rpm,2hで反応させた後、さらに、4℃、16hの反応を行った。反応終了後、反応液1μLを用いてSDS-PAGE(15%)を行い、蛍光イメージアナライザー(FMBIO-III;日立ソフトウェアエンジニアリング社製)でタンパク質発現を観察した。さらに、His-tag抗体を用いてウエスタンブロットを行い、目的のタンパク質が合成されていることを確認した。
実施例1で作製したTAMRA標識抗BGP抗体VHタンパク質及びCR110標識抗BGP抗体VLタンパク質(それぞれ1μg/mL、30μL)と、抗原となる7残基のBGPのC末端ペプチド(RRFYGPV;配列番号8)とを、PBS(+0.05%tween20)で計200μLになるように調製した。25℃、90分間放置した後に、蛍光分光光度計(FluoroMax-4;ホリバ・ジョバンイボン社製)を用いて蛍光スペクトル測定を行った。励起波長は、CR110-VLとTAMRA-VHの混合物に対しては490nm、TAMRA-VHに対しては550nmにセットした。CR110-VLとTAMRA-VHの混合物に対しては蛍光強度比IA/IDを算出した。IAとIDは、それぞれ575nmと525nmでの蛍光強度とした。解離定数(Kd)値は、蛍光強度比(IA/ID)もしくは最大蛍光波長の蛍光強度のカーブフィッテングにて算出した。その際、統計解析ソフトとしてGraphpad Prism(Graphpad社製)のsigmoidal dose-response modelを使用した。異なる濃度のBGPペプチドの存在下で、CR110-VL及びTAMRA-VHを反応させて、490nmの励起光を用いて蛍光スペクトルを測定した結果を図2に、525nm及び575nmの蛍光強度の変化を測定した結果を図3に、525nm及び575nmの蛍光強度の比(F575/F525)の変化を解析した結果を図4にそれぞれ示す。スペーサーを含む又は含まないTAMRA標識抗BGP抗体scFvタンパク質(2μg/mL、25μL)と、抗原であるBGPペプチドとを、計200μLのPBS(+0.05%Tween20、0.2%BSA)となるようにサンプルを調製した。その後、サンプルを25℃、70分間放置した後に、蛍光分光光度計(FluoroMax-4;ホリバ・ジョバンイボン社製)を用いて蛍光スペクトル測定を行い、蛍光強度をカーブフィッテングにて算出した。その際、統計解析ソフトとしてImageJ software(http://rsbweb.nih.gov/ij/)のsigmoidal dose-response modelを使用した。励起波長は550nm、測定波長は580nmで測定を行った。
実施例1で作製した蛍光標識VHタンパク質及び蛍光標識VLタンパク質(それぞれ1μg/mL、7.5μL)、又は、蛍光標識scFv(1μg/mL、7.5μL)を、BGPペプチドともにPBS(+0.05%Tween20)で50μLになるように調製し、384-well Glass Bottom Microplate(オリンパス社製)に加え、25℃で90間インキュベートした。蛍光強度分布解析法(Fluorescence Intensity Multiple Distribution Analysis;FIDA)による測定は、25℃でMF20/FluoroPoint-Light(オリンパス社製)を用いて測定した。TAMRAとATTO655は、それぞれ543nmと633nmのレーザーで励起した。1測定で10秒間データを取得し、1サンプルに対して10回測定を行った。この測定値より平均値及び標準偏差を算出した。
まず、蛍光共鳴エネルギー転移法(FRET)を利用した抗体/抗原結合活性評価系の確立を試みた。FRET測定には、CR110とTAMRAをそれぞれドナー、アクセプターとして使用した。ドナー(CR110)の蛍光とアクセプター(TAMRA)の吸収は、十分な重なりを持っておりFRETペアとして用いることができる。配向因子(κ2)を2/3とした際フェルスター距離(R0)は62Åと計算され、この値はタンパク質の分子間相互作用を検出するのに適している。抗原が存在しない場合、VLとVH間の相互作用は弱いため、CR110からTAMARへFRETは起きないのに対して、抗原が存在する場合には、VHとVLは抗原と三者複合体を形成し、その結果、CR110からTAMRAへのFRETが引き起こされると予測される。
発明者らは、実施例3で明らかとなったクエンチ現象を利用することにより、新たな免疫測定法を確立することができるのではないかと考え、以下の実験を行った。TAMRA-VHと異なる濃度のBGPペプチドとを、標識されていないVLの存在又は非存在下で反応させ、543nmのHe-Neレーザーを用いて蛍光強度を測定した結果を図7に示す。VLの存在下では、TAMRA-VHの蛍光強度はBGPペプチドの濃度依存的に増加した。一方、VLの非存在下では、TAMRA-VHの蛍光強度はいずれの濃度のBGPペプチドを反応させた場合にも低いままであった。また、VLの存在/非存在下におけるTAMRA-VHの蛍光強度の比(+VL/-VL)を解析した結果、解離定数Kd=1.2x10-7[M]であった(図8)。以上の結果から、VH及びVLタンパク質によるクエンチ現象を利用した、全く新しい均一系蛍光免疫測定法が確立できたことが示された。
実施例3の結果から、抗原の滴定に対してCR110の蛍光減少量よりもTAMRAの蛍光増加量が高いことが明らかとなった。TAMRAはローダミン(Rhodamine)系色素であり、これまでの研究によりローダミン系色素はトリプトファン(Trp)等のアミノ酸によりクエンチ(消光)されることが報告されている。そこで、発明者らは、VH中に存在するTrp残基がTAMRAのクエンチングに関与していると推測し、TAMRA-VHが単独で存在する場合には、TAMRAの蛍光はその近傍に存在するTrp残基によりクエンチされているが、TAMRA-VHがVL及び抗原と複合体を形成することにより、TAMRA/Trp間の相互位置を変化させてクエンチを解消しているとの仮説を立てた。図9に示すように、VHは4つのTrp残基(Trp33、Trp36、Trp47、Trp106)を持つ。予想分子モデルによる解析では、Trp33、Trp36及びTrp106はVLとの疎水相互作用に関与しており、Trp33はBGPペプチドとの相互作用に関与していると予想された。これらのTrp残基がクエンチに影響を及ぼすかを検討する目的で、TrpをPheに置換した4種の変異型VHを用いて以下の実験を行った。
均一系蛍光免疫測定法の感度に及ぼす蛍光色素及びスペーサーの影響について検討した。クエンチングの効率は蛍光色素の種類に依存して大きく変化し、ローダミン系の色素よりも、オキサジン(Oxazin)系の色素は効果的にクエンチされることが報告されている。そこで、発明者らは、オキサジン系蛍光色素であるATTO655を標識物質として使用したATTO655-VHを作製して実施例4と同様の実験を行った。さらに、ATTO655とVHとの間にGGGSGGGS(配列番号4)をスペーサーとして付加したATTO655-VH(+spacer)を作製し、スペーサーの有無がクエンチ効果に及ぼす影響について検討した。図12にスペーサー付加蛍光標識抗BGP抗体重鎖可変領域ポリペプチド(Fluorescent labeled BGP-VH)と、抗BGP抗体軽鎖可変領域ポリペプチド(BGP-VL)との複合体(Fluorescent labeled BGP-VH/VL)の3次元構造予測モデルを示す。
また、VLの存在/非存在下におけるATTO655-VHの蛍光強度の比(+VL/-VL)を解析した結果(図14)、スペーサーを付加しない場合は解離定数Kd=8.4x10-8[M]、スペーサーを付加した場合は解離定数Kd=1.8x10-7[M]であった。解離定数が高いほど測定系の感度は高いと考えられるので、以上の結果は、蛍光色素とVHの間にスペーサーを設けることにより、より感度の高い測定系が確立できたことを意味している。
VHとVLとを配列番号5又は配列番号9に示されるアミノ酸配列からなるリンカーにより結合させた一本鎖抗体(scFv)を用いた均一系蛍光免疫測定法を確立する目的で以下の実験を行った。本発明の蛍光標識抗体重鎖可変領域ポリペプチドと抗体軽鎖可変領域ポリペプチドとを結合させた蛍光標識一本鎖抗体の3次元構造予測モデルを図15に、1次元構造を図16に示す。VH及びVLのそれぞれのペプチド断片を用いた場合と同様に、蛍光標識scFvを用いた場合にも、BGPペプチドの濃度依存的な蛍光強度の増加が認められた。配列番号5のリンカーにより結合させたATTO655標識抗BGP抗体scFvの結果を図17~22に、配列番号9のリンカーにより結合させたTAMRA標識抗BGP抗体scFvの結果を図23に示す。
TAMRA標識抗BGP抗体scFvタンパク質(2μg/mL、6.25μL)と、抗原であるBGPペプチドを、50%ヒト血漿を含むサンプルとなるよう、PBS(+0.05%Tween20、0.2%BSA)で計50uLに調製した。その後、25℃、90分間放置した後に、蛍光イメージアナライザー(FMBIO-III;日立ソフトウエアエンジニアリング社製)で観察した。励起波長は532nm、測定波長は580nmで測定を行った。結果を図24に示す。50%のヒト血漿を含むサンプル中でもBGPペプチドの濃度依存的な蛍光強度の増加が認められた。
(抗BPA抗体由のV領域遺伝子発現ベクターの構築)
抗ビスフェノールA(BPA)抗体のVH(配列番号6)をコードする遺伝子に、N末端にamberコドンを含むProXTMtag(MSKQIEVNXSNET(Xは蛍光標識アミノ酸);配列番号3)のDNA配列を付与した遺伝子を、pIVEX2.3dベクター(ロシュ・ダイアグノスティックス社製)のNcoIとHindIIIサイトへ組み込んだ。この構築した発現ベクターは、挿入したVHのN末端にamberコドンを含むProXTMtag(MSKQIEVNXSNET(Xは蛍光標識アミノ酸);配列番号3)が、C末端にHis-tagが、それぞれ付加されるよう設計されている。また、同様にして抗BPA抗体のVL(配列番号7)をコードする遺伝子に、N末端ProXTMtagのアミノ酸XがFに置換されたDNA配列を付与し、pIVEX2.3dベクター(ロシュ・ダイアグノスティックス社製)のNcoIとHindIIIサイトへ組み込まれた。この構築した発現ベクターは、挿入したVLのN末端ProXTMtagのアミノ酸XがFに置換された配列が、C末端にHis-tagが、付加されるよう設計されている。さらに、VH遺伝子とVL遺伝子とをリンカー(GGGGSGGGGSGGGGS;配列番号9)により結合させた一本鎖抗体(scFv)発現ベクター、ProXTMtagとscFvのN末端との間にスペーサー(GGGSGGGS;配列番号4、GGGSGGGSGGGS;配列番号10又はGGGSGGGSGGGSGGGSGGGS;配列番号11)を有する3種類の一本鎖抗体(scFv)発現ベクターもあわせて作製した。
RTS100 E.coli Disulfide Kit(ロシュ・ダイアグノスティックス社製)を用いて、無細胞翻訳系によるV領域タンパク質のN末端領域への蛍光標識アミノ酸の導入を行った。反応液(50μL)は、7μLのamino acid mix、1μLのMethionine、7μLのReaction mix、25μLのactivated E-coli Lysate、5μLのplasmid DNA(500ng)、5μLのATTO655-X-AF-tRNAamber(0.8nmol)を加えた。蛍光標識タンパク質を作製するためのATTO655-X-AF-tRNAamberは、CloverDirectTM tRNA Reagents for Site-Derected Protein Functionalization(プロテインエクスプレス社製)を用いた。反応液は、20℃、600rpm、2hで反応を行い、その後4℃、16h反応を行った。反応終了後、反応液1μLを用いて、SDS-PAGE(15%)を行い、蛍光イメージアナライザー(FMBIO-III;日立ソフトウエアエンジニアリング社製)でタンパク質発現を観察した。さらにHis-tag抗体を用いてウエスタンブロットを行い、目的のタンパク質が合成されていることを確認した。
実施例9で作製したATTO655標識抗BPA抗体VHタンパク質及び標識されていない抗BPA抗体VLタンパク質(それぞれ1μg/mL、7.5μL)と、抗原であるBPAとを、Total 50uLの10%MeOH in PBS(+0.05%Tween20)となるように調製し、25℃、90分間放置した後に、蛍光イメージアナライザー(FMBIO-III;日立ソフトウエアエンジニアリング社製)で観察した。励起波長は635nm、測定波長は670nmで測定を行った。解離定数(Kd)値は、蛍光測定値のカーブフィッテングにて算出した。その際、統計解析ソフトとしてGraphpad Prism(Graphpad社製)のsigmoidal dose-response modelを使用した。
スペーサーを含む又は含まないTAMRA標識抗BPA抗体scFvタンパク質(2μg/mL、25μL)と、抗原であるBPAとを、計200μLのPBS(+0.05%Tween20、0.2%BSA、1%MeOH)となるようにサンプルを調製した。その後、サンプルを25℃、10分間放置した後に、蛍光分光光度計(FluoroMax-4;ホリバ・ジョバンイボン社製)を用いて蛍光スペクトル測定を行い、蛍光強度をカーブフィッテングにて算出した。その際、統計解析ソフトとしてImageJ software(http://rsbweb.nih.gov/ij/)のsigmoidal dose-response modelを使用した。励起波長は550nm、測定波長は580nmで測定を行った。
ATTO655-VH及び蛍光標識されていないVLを用いた均一系蛍光免疫測定法の確立を目的として以下の実験を行った。ATTO655-VHと異なる濃度のBPAとを、標識されていないVLの存在下又は非存在下で反応させ、蛍光強度を測定した(図25)。VLの存在下では、ATTO655-VHの蛍光強度はBPAの濃度依存的に増加した。一方、VLの非存在下では、ATTO655-VHの蛍光強度はいずれの濃度のBPAを反応させた場合にも低いままであった。また、VLの存在/非存在下におけるATTO655-VHの蛍光強度の比(+VL/-VL)を解析した結果、解離定数(Kd)は2.4x10-8[M]であった(図26)。また、実施例7と同様に、一本鎖抗体(scFv)を用いた蛍光免疫測定法の確立を目的として以下の実験を行った。TAMRA標識抗BPA抗体scFvを用いた場合も、VH及びVLのそれぞれのペプチド断片を用いた場合と同様に、BPAの濃度依存的な蛍光強度の増加が認められた(図27)。
(抗HEL抗体、抗エストラジオール抗体、抗SA抗体由のV領域遺伝子発現ベクターの構築)
一本鎖抗体(scFv)のDNA配列のN末端にamberコドンを含むProXTMtag(MSKQIEVNXSNET(Xは蛍光標識アミノ酸);配列番号3)を、C末端にHis-tagを有し、ProXTMtagとscFvのN末端との間にスペーサー(GGGSGGGS;配列番号4)を有するDNA配列を、pIVEX2.3dベクター(ロシュ・ダイアグノスティックス社製)のNcoIとHindIIIサイトへ組み込み、発現ベクターを構築した。各一本鎖抗体(scFv)のDNA配列は、以下のとおりである;抗鶏卵リゾチーム(HEL)抗体scFvは、抗HEL抗体のVH(配列番号12)とVL(配列番号13)を順次リンカー配列(GGGGSGGGGSGGGGS;配列番号9)で結合した配列;エストラジオール(estradiol)抗体scFvは、抗エストラジオール抗体のVH(配列番号14)とVL(配列番号15)を順次リンカー配列(GGGGSGGGGSGGGGS;配列番号9)で結合した配列;SA(Serum Albumin)抗体scFvは、抗SA抗体のVH(配列番号16)とVL(配列番号17)を順次リンカー配列(GGGGSGGGGSGGGGS;配列番号9)で結合した配列。
RTS100 E.coli Disulfide Kit(ロシュ・ダイアグノスティックス社製)を用いて、無細胞翻訳系によるV領域タンパク質N末端領域への蛍光標識アミノ酸の導入を行った。反応液(50μL)は、7μLのamino acid mix、1μLのMethionine、7μLのReactionmix、25μLのactivated E-coli Lysate、5μLのplasmid DNA(500ng)、5μLの蛍光標識アミノアシル-tRNAamber(0.8nmol)を加えた。蛍光標識タンパク質を作製するための蛍光標識アミノアシル-tRNA(TAMRA-X-AF-tRNAamber)は、CloverDirectTM tRNA Reagents for Site-Derected Protein Functionalization(プロテインエクスプレス社製)を用いた。反応液は、20℃,600rpm,2hで反応させた後、さらに、4℃、16hの反応を行った。反応終了後、反応液1μLを用いてSDS-PAGE(15%)を行い、蛍光イメージアナライザー(FMBIO-III;日立ソフトウェアエンジニアリング社製)でタンパク質発現を観察した。さらに、His-tag抗体を用いてウエスタンブロットを行い、目的のタンパク質が合成されていることを確認した。
TAMRA標識抗HEL抗体scFvタンパク質(2μg/mL、25μL)と、抗原であるHELタンパク質とを、計200μLのPBS(+0.05%Tween20、1%BSA)となるようにサンプルを調製した。TAMRA標識抗エストラジオール抗体scFvタンパク質(2μg/mL、25μL)と、抗原であるエストラジオールとを、計200μLのPBS(+0.05%Tween20、1%BSA)となるようにサンプルを調製した。TAMRA標識抗SA抗体scFvタンパク質(2μg/mL、25μL)と、抗原であるBSA(ウシ血清アルブミン)又はHSA(ヒト血清アルブミン)とを、計200μLのPBS(+0.05%Tween20、0.2%ゼラチン)となるようにサンプルを調製した。その後、サンプルを25℃、5分間放置した後に、蛍光分光光度計(FluoroMax-4;ホリバ・ジョバンイボン社製)を用いて蛍光スペクトル測定を行い、蛍光強度をカーブフィッテングにて算出した。その際、統計解析ソフトとしてImageJ software(http://rsbweb.nih.gov/ij/)のsigmoidal dose-response modelを使用した。励起波長は550nm、測定波長は580nmで測定を行ったところ、抗原の濃度依存的な蛍光強度の増加が認められた(図28~30)。以上のように、様々な種類の抗体の蛍光標識一本鎖抗体(scFv)を用いて、蛍光免疫測定法を行うことができることが示された。
実施例4、図9、及び表1に示すように、抗BGP抗体において標識された蛍光色素のクエンチングには、VHのアミノ酸配列においカバット(Kabat)の番号付け系で第33番目、第36番目及び第106番目のTrpが重要な役割を果たしていること、また、第47番目のTrpは抗体(VH及びVL)と抗原の結合に必須であることが明らかとなった(なお、上記のVHのアミノ酸配列におけるTrp106は、カバット(Kabat)の番号付け系においては第103番目の位置に対応するものである)。そこで、抗BGP抗体以外のマウス抗体VH領域においても、これらのトリプトファン残基が保存されているかどうかを確認した。マウス抗体のアミノ酸残基分布の解析にはAbysisデータベース(Dr. Andrew C.R. Martin's Group;http://www.bioinf.org.uk/abs/index.html)を用いた。また、上記データベースにおける、各抗体残基のKabat配列表記による残基番号についても、AbCheck(Dr. Andrew C.R. Martin's Group;Martin, A.C.R. Accessingthe Kabat Antibody Sequence Database by Computer PROTEINS: Structure, Function and Genetics, 25 (1996), 130-133;http://www.bioinf.org.uk/abs/seqtest.html)により調べた。図31~35に結果を示すように、マウス抗体のVH領域における4つのTrp残基の保存率は、Trp33は40%、Trp36は98%、Trp47は94%、Trp103は95%であった。これらの結果は、均一系蛍光免疫測定法を行う際に重要なVHの4つのTrp残基が多くのマウス抗体VHで保存されていることを示している。
Claims (12)
- 抗体軽鎖可変領域ポリペプチドと抗体重鎖可変領域ポリペプチドとを備え、前記抗体軽鎖可変領域ポリペプチドと抗体重鎖可変領域ポリペプチドのいずれか一方が蛍光色素により標識されたキットであって、液相中の抗原濃度と上記蛍光色素の蛍光強度とが正の相関関係にあることを指標として、抗原濃度の測定又は抗原の可視化を可能とすることを特徴とする抗原濃度測定・検出用キット。
- 抗体重鎖可変領域ポリペプチドと抗体軽鎖可変領域ポリペプチドとが結合した一本鎖抗体であることを特徴とする請求項1記載の抗原濃度測定・検出用キット。
- 蛍光色素が、ローダミン系蛍光色素又はオキサジン系蛍光色素であることを特徴とする請求項1又は2記載の抗原濃度測定・検出用キット。
- 蛍光色素が、CR110、TAMRA、又はATTO655であることを特徴とする請求項3記載の抗原濃度測定・検出用キット。
- 抗体重鎖可変領域ポリペプチドが配列番号1に示されるアミノ酸配列からなるポリペプチドを含み、抗体軽鎖可変領域ポリペプチドが配列番号2に示されるアミノ酸配列からなるポリペプチドを含むことを特徴とする請求項1~4のいずれかに記載の抗原濃度測定・検出用キット。
- 抗体重鎖可変領域ポリペプチドが配列番号6に示されるアミノ酸配列からなるポリペプチドを含み、抗体軽鎖可変領域ポリペプチドが配列番号7に示されるアミノ酸配列からなるポリペプチドを含むことを特徴とする請求項1~4のいずれかに記載の抗原濃度測定・検出用キット。
- 以下の工程(a)~(c)を順次備えることを特徴とする抗原濃度測定・検出方法。
(a)抗体軽鎖可変領域ポリペプチドと蛍光色素により標識された抗体重鎖可変領域ポリペプチド、又は、抗体重鎖可変領域ポリペプチドと蛍光色素により標識された抗体軽鎖可変領域ポリペプチドを、
(a1)液相中で、被検物質中の抗原に接触させる工程;又は
(a2)抗体軽鎖可変領域ポリペプチドと蛍光色素により標識された抗体重鎖可変領域ポリペプチド、又は、抗体重鎖可変領域ポリペプチドと蛍光色素により標識された抗体軽鎖可変領域ポリペプチドを投与した被検非ヒト動物対象中の抗原に接触させる工程;又は
(a3)インビトロで、被検対象中の抗原に接触させる工程;
(b)前記(a1)の場合には、蛍光色素の蛍光強度を測定し、
前記(a2)及び(a3)の場合には、前記蛍光色素の蛍光を検出する工程;
(c)液相中の抗原濃度と前記蛍光色素の蛍光強度とが、正の相関関係にあることを指標として、前記(a1)の場合には、被検物質に含まれる抗原量を算出し、前記(a2)及び(a3)の場合には、被検対象に含まれる抗原を可視化する工程; - 抗体重鎖可変領域ポリペプチドと抗体軽鎖可変領域ポリペプチドとが結合した一本鎖抗体であることを特徴とする請求項7記載の抗原濃度測定・検出方法。
- 蛍光色素が、ローダミン系蛍光色素又はオキサジン系蛍光色素であることを特徴とする請求項7又は8記載の抗原濃度測定・検出方法。
- 蛍光色素が、CR110、TAMRA、又はATTO655であることを特徴とする請求項9記載の抗原濃度測定・検出方法。
- 抗体重鎖可変領域ポリペプチドが配列番号1に示されるアミノ酸配列からなるポリペプチドを含み、抗体軽鎖可変領域ポリペプチドが配列番号2に示されるアミノ酸配列からなるポリペプチドを含むことを特徴とする請求項7~10のいずれかに記載の抗原濃度測定・検出方法。
- 抗体重鎖可変領域ポリペプチドが配列番号6に示されるアミノ酸配列からなるポリペプチドを含み、抗体軽鎖可変領域ポリペプチドが配列番号7に示されるアミノ酸配列からなるポリペプチドを含むことを特徴とする請求項7~10のいずれかに記載の抗原濃度測定・検出方法。
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CA2780845C (en) | 2014-12-30 |
EP2515110A4 (en) | 2013-05-01 |
EP2515110A1 (en) | 2012-10-24 |
JP5043237B2 (ja) | 2012-10-10 |
CN102667480A (zh) | 2012-09-12 |
CA2780845A1 (en) | 2011-05-26 |
WO2011061944A8 (ja) | 2012-06-07 |
US20120270338A1 (en) | 2012-10-25 |
KR101335560B1 (ko) | 2013-12-31 |
KR20120086346A (ko) | 2012-08-02 |
EP2515110B1 (en) | 2015-03-25 |
CN102667480B (zh) | 2014-08-20 |
US20160349266A1 (en) | 2016-12-01 |
JPWO2011061944A1 (ja) | 2013-04-04 |
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