WO2005064333A1 - タンパク質と糖鎖との相互作用を分析する方法 - Google Patents
タンパク質と糖鎖との相互作用を分析する方法 Download PDFInfo
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- WO2005064333A1 WO2005064333A1 PCT/JP2004/019333 JP2004019333W WO2005064333A1 WO 2005064333 A1 WO2005064333 A1 WO 2005064333A1 JP 2004019333 W JP2004019333 W JP 2004019333W WO 2005064333 A1 WO2005064333 A1 WO 2005064333A1
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- sugar chain
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- lectin
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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
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
- G01N33/54393—Improving reaction conditions or stability, e.g. by coating or irradiation of surface, by reduction of non-specific binding, by promotion of specific binding
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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
- G01N33/543—Immunoassay; Biospecific binding assay; Materials therefor with an insoluble carrier for immobilising immunochemicals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S435/00—Chemistry: molecular biology and microbiology
- Y10S435/97—Test strip or test slide
Definitions
- the present invention relates to a method for analyzing an interaction between a protein and a sugar chain.
- Protein power which plays a leading role in the vital functions of living organisms.
- Post-translational modifications such as sugar chain modifications play a very important role in orderly exerting functions in a cellular society.
- Most proteins in the living body are modified by sugar chains, and the sugar chains added to the proteins can be infected by viruses, parasites, infection, binding of toxins, binding of hormones, fertilization, development and differentiation, In recent years, it has become clear that it plays an important role in various aspects of life phenomena, such as stability, cancer cell metastasis, and apoptosis.
- a microarray is a general term for a plurality of immobilized samples such as DNA 'proteins, which are immobilized in a spot form on a solid support (glass' membrane' silicon chip) at a high density. It is possible to detect the presence or absence of a molecule (hereinafter referred to as a probe) that specifically binds to the sample spot. Fluorescently labeled probe molecules are generally used, and after the probe solution is reacted with the array surface, it is observed with a fluorescence detection scanner to quantify the probe molecules bound to each sample spot. Analysis can be performed. Since the development of DNA microarrays by Affimetrix in the U.S., microarrays have been used in a very wide range of research fields, bringing a variety of new insights to humanity.
- these dissociation constants (K) is often at 10- 6 M or more.
- sugar chains and sugar chains are often at 10- 6 M or more.
- the probe solution is washed and removed after the probe solution is brought into contact with the immobilized sample to reach a binding reaction, and a jet gas or a centrifuge is used. After performing the operation to completely remove water adhering to the slide glass using the above, perform imaging using a microarray scanner. This is due to the fact that a general microarray reader cannot observe fluorescence on a slide glass with moisture attached. Even if the probe solution is removed before scanning as described above, the dissociation rate constant is sufficiently small for interactions that show strong binding, such as complementary nucleotide fragments or antigen-antibody reactions. The reaction is not expected to proceed easily.
- Protein microarrays are also used in basic research fields such as elucidating the functions of proteins that are transcripts of DNA in vivo, and in application fields such as diagnosis and judgment based on quantitative and qualitative changes in proteins.
- active use is expected in the future, and active research has been conducted worldwide in terms of research.
- the spread of protein microarrays is far behind that of DNA microarrays.
- One of the reasons for this is that it is technically very difficult to immobilize protein samples with various properties at a fixed rate while maintaining their activity. It has been pointed out by more researchers.
- Non-Patent Document 1 a method of physically adsorbing proteins onto a membrane typified by a PVDF membrane.
- Some proteins, such as transcription factors, have been reported to be able to maintain some activity.
- immobilization on a membrane there is a limit in increasing the density of the array.
- immobilizing proteins on solid surfaces such as metals and glass.
- proteins are applied to solid surfaces such as metals and glass. It has the property of being easily denatured by contact. For this reason, an immobilization method using some kind of linker to crosslink a protein with a solid surface has been intensively researched and developed.
- Non-Patent Document 1 a method of bonding a polyacrylamide pad of 10 to 100 m in thickness on a slide glass and spotting a protein on the pad is used (see Non-Patent Document 1).
- Patent documents 2 and 3 the protein is immobilized in a three-dimensional space, so it can be expected to be more than 100 times more quantitative than the method of immobilizing it on a two-dimensional surface.
- these methods require the production of expensive and special slide glasses, and have not been widely used. Further, it may not be preferable that the immobilized protein layer has a thickness depending on the detection method.
- a protein is expressed in a form to which a tag is added, and the protein is transferred to a solid phase carrier via a tag portion of the protein.
- a method of performing a fixed dangling According to this method, if the effective ligand concentration of the protein is increased, it is possible in principle to make the irrigation effect and the orientation of the protein uniform.
- Non-patent Document 5 a method of immobilizing the substrate to a surface modified with a nickel complex via an oligohistidine tag
- Patent Document 1 a method of immobilizing avidin-biotin
- Such a method is considered to be an effective method in that immobilization is performed while the activity of the protein is maintained, or the immobilization ratio is uniform.
- adding a tag at the gene level to all the proteins to be immobilized on the microarray and expressing and purifying it in E. coli or a cell-free system would require a large amount of cost and enormous labor. At this point, it is difficult for general researchers to use the system freely and in a manner that suits individual needs.
- a method of using a protein functional group for immobilization on a solid phase carrier involves immobilizing a protein extracted from nature or a commercially available protein sample as it is, and forming a microarray. When available, it has ⁇ ⁇ features.
- Examples of a method for immobilizing a protein on a solid support via an amino group in a protein include a method for immobilizing a protein via an active ester group bonded to the surface of a solid phase, and an epoxy group arranged on the surface of a solid phase.
- a method for immobilizing a protein via a method Non-Patent Document 6). The method of immobilizing a protein via an amino group is a simple method.
- Patent Document 1 Patent application 2001—520104
- Patent Document 2 Patent Publication 8—201383
- Patent document 3 Patent publication 2002—544485
- Non-Patent Document 1 LJ Holt, K. Bussow, G. Walter, IM Tomlinson, Nucleic Acids Res., 15, E72, 2000
- Non-Patent Document 2 D. Guschin, G. Yershov, A. Zaslavsky, A. Gemmell, V. Shick, D.
- Non-Patent Document 3 A. Lueking, M. Horn, H. Eickhoff, K. Bussow, H. Lehrach, G.
- Non-Patent Document 4 P. Mitchell, Nat.BiotechnoL, 20, 225-229, 2002
- Non-Patent Document 5 H. Zhu, M. Bilgin, R. Bangham, D. Hall, A. Casamayor, P. Bertone,
- Non-Patent Document 6 H. Zhu, JF Klemic, S. Chang, P. Bertone, A. Casamayor, KG Klemic, D. Smith, M. Gerstein, MA Reed, M. Snyder, Nat.Genetics. 26, 283- 289, 2000
- An object of the present invention is to provide a method for simply and simply analyzing the interaction between a sugar chain and a protein that interacts with the sugar chain at high speed, high sensitivity, and high accuracy.
- the present inventors have conducted intensive research to solve the above-mentioned problems.
- cross-linking with a solid phase carrier generally occurs at random positions in the protein, so that there may be some molecules whose activity is impaired at a certain probability. In addition, there is a high probability that the activity of the protein will survive with a certain probability (the danger of losing the protein is small).
- Such properties are very useful in practical use in a microarray that is intended to immobilize a large number of proteins having different properties and proteins whose properties are unknown.
- the inventors of the present invention consider the practicality of microarrays in producing lectin arrays, their usefulness in application, responsiveness to analysis target objects, competitiveness in the market (including cost), and the like.
- the immobilization method using the amino group of the protein is the best considering the overall consideration.
- the optimal conditions for the immobilization method via an amino group are The aim was to improve the noise-to-noise ratio (S / N ratio) and the protein immobilization density.
- the protein sample was immobilized under conditions with a higher S / N ratio than the conventional product.
- GTMS 3-glycidoxypropyltrimethoxysilane
- the present inventors created a substrate in which a plurality of reaction vessels were formed on glass by attaching a rubber having a plurality of holes, and accurately placed a fluorescence-labeled probe solution around a lectin spot. Made it possible to meet.
- spotting of lectin and washing with PBST improved the density of lectin immobilization and succeeded in detecting weak interaction between sugar chain and lectin with higher sensitivity.
- the operation of washing and removing the probe solution which is a major problem in accurately analyzing the information on the interaction between the lectin and the sugar chain in the equilibrium state, becomes unnecessary. This makes it possible to detect even weak interactions that would otherwise occur.
- the lectin array can be put into practical use by improving the immobilization method and the detection method. That is, the present invention relates to a method for analyzing the interaction between a protein that interacts with a sugar chain and a sugar chain, and provides the following [1]-[22].
- a method for analyzing the interaction between a protein that interacts with a sugar chain and the sugar chain comprising the following steps.
- a substrate on which a protein that interacts with a sugar chain is immobilized is a substrate on which a protein that interacts with a sugar chain is immobilized on a substrate coated with a compound having an epoxy group as an active group.
- a method for analyzing the interaction between a sugar chain and a protein that interacts with the sugar chain comprising the following steps.
- a method for analyzing the interaction between a protein that interacts with a sugar chain and the sugar chain comprising the following steps.
- step (b) Step of bringing a protein that interacts with a fluorescently labeled sugar chain into contact with the substrate obtained in step (a)
- a substrate on which a protein that interacts with a region other than the sugar chain of the complex carbohydrate is immobilized is placed on a substrate coated with a compound having an epoxy group as an active group.
- the method according to [7], wherein the protein exhibiting the interaction is an immobilized substrate.
- a protein that interacts with a sugar chain is a lectin, an enzyme protein having a sugar binding domain, a cytokinin having an affinity for a sugar chain, or an antibody that interacts with a sugar chain.
- a protein that interacts with a sugar chain is a lectin, an enzyme protein having a sugar binding domain, a cytokinin having affinity for a sugar chain, or an antibody that interacts with a sugar chain; [14 ] Or the substrate according to [15].
- the glycoconjugate is a glycoprotein, proteodalican, or glycolipid; [14] one [1
- a method for manufacturing a substrate comprising the following steps.
- step (b) a step of immobilizing a protein that interacts with a sugar chain on the substrate obtained in step (a) or a protein that interacts with a region other than the sugar chain of the glycoconjugate;
- a protein that interacts with a sugar chain is a lectin, an enzyme protein having a sugar-binding domain, a cytokinin having affinity for a sugar chain, or an antibody that interacts with a sugar chain; [19 ].
- glycoconjugate is a glycoprotein, proteodalican, or glycolipid
- FIG. 1 is a configuration diagram of a system of the present invention.
- the detecting means is a microarray scanner device.
- FIG. 2 is a configuration diagram of a computer in the system of the present invention.
- the storage means 6 stores at least a program 61-163 for executing the processing of the system using the microarray scanner device.
- the storage means (database) 7 stores information on the interaction of a plurality of sugar chains with various proteins that interact with sugar chains, and information on Z or a combination pattern of the interaction information.
- FIG. 3 is a diagram showing a reaction process of GTMS on a glass surface.
- GTMS alkoxysilyl groups are hydrolyzed with water to silanol groups. These silanol groups are unstable, and partially condense into an oligomer state with the passage of time, and subsequently adsorb to the glass surface in a hydrogen bonding manner. Thereafter, the glass is dried to cause a dehydration-condensation reaction with silanol groups on the glass surface, resulting in a strong covalent bond.
- FIG. 4 is a view showing a substrate on which eight reaction vessels used in the present example are formed.
- the thickness of the newly designed 8-hole rubber is 1 mm, and it is possible to accurately fill the spot around the spot with the fluorescence-labeled dagger sugar probe solution by bringing it into close contact with the slide glass on a dedicated adjuster star.
- the optimal amount of sample to fill the reactor is 50 / zL.
- FIG. 5 is a conceptual diagram of a lectin array performance experiment in which a Cy3-ASF solution is squeezed onto an array on which two types of lectins are immobilized.
- FIG. 8 is a graph showing the effect of inhibitory sugars on lectin-sugar chain interaction.
- the experiment was performed in the presence of lactose (competitive inhibitory sugar).
- the fluorescence intensity of the spots decreased as the concentration of coexisting ratatose (competitive inhibitory sugar) increased, indicating that the binding of the fluorescent glycoprotein probe was a sugar-specific binding reaction between the lectin and the sugar chain. It could be confirmed.
- FIG. 9 is a schematic diagram of the interaction between each sugar chain-related array and a sugar chain.
- A Lectin array and FIG. 4 is a schematic diagram when a sugar chain is used as a probe. It can be used for structural analogy of fluorescently labeled sugar chains. In addition, the sugar chain can be indirectly fluorescently labeled.
- B Lectin array and a schematic diagram in the case of using a glycoprotein as a probe. It can be used to analogize the sugar chain structure on proteins. The sugar chain can also be indirectly fluorescently labeled.
- C Schematic diagram when using a glycopeptide array and lectin as a probe. It can be used for analogy of the sugar chain structure on the fractionated peptide.
- D Schematic diagram when using a glycoprotein array and lectin as a probe. It can be used for analogy of the sugar chain structure on two-dimensionally fractionated proteins.
- E Schematic diagram when using lectin as the antibody array and probe. It can be used to infer the sugar chain structure on crude glycoproteins.
- FIG. 10 is a photograph showing an example of a lectin-antibody hybrid array. Specifically, a probe solution in which each model protein was fluorescently labeled was brought into contact with an array in which 7 types of lectins and 2 types of antibodies were immobilized, and after parallelization, an evanescent excitation scanner was used. The result of observation using the above is shown.
- FIG. 12 is a diagram and a photograph showing the results of a glycopeptide array detection experiment in which the HPLC fraction of a mouse liver-derived glycopeptide sample was immobilized.
- Fuc is a fucose recognition lectin group
- Sia is a sialic acid recognition lectin group
- Lac is a ratatose recognition lectin group
- Gal is a galactose recognition lectin group
- GalNAc is an N-acetyl galatatosamine recognition lectin group
- Man is a mannose recognition.
- Lectin group, Chitin means chitin recognition lectin group.
- FIG. 13 is a photograph and a diagram showing the results of an experiment using a glycopeptide probe for detection of a lectin array.
- FIG. 14 is a photograph showing an analysis result by a lectin array when a crude sample derived from a living body is probed.
- the present invention provides a method for analyzing the interaction between a sugar chain and a protein that interacts with the sugar chain.
- the method of the present invention comprises the steps of contacting a fluorescently labeled test sugar chain or a test glycoconjugate with a substrate on which a protein that interacts with a sugar chain is immobilized, and exciting without washing the substrate. Measuring the intensity of the excited fluorescence by applying light.
- the sugar chains in the present invention include, for example, glycoprotein sugar chains (N-linked sugar chains and 0-linked sugar chains), glycolipid sugar chains, glycosaminodalican sugar chains, or And polysaccharide-derived oligosaccharide chains.
- N-linked sugar chains include N-linked sugar chains of high-mannose type 'mixed-type' complex type, etc.
- Glycolipid-based glycans include gandario-type 'globo-type' lacto 'neolacto-type glycans.
- Glycosaminodalican-based sugar chains include hyaluronic acid 'keratan sulfate' heparin 'heparan sulfate' chondroitin sulfate 'dermatan sulfate, etc.5)
- Polysaccharide-derived oligosaccharide chains include chitin, cellulose, curdlan, Examples thereof include oligosaccharide chains derived from laminarin, dextran, starch, glycogen, arabinogalatatan, alginic acid, fructan, fucoidan, xylan, and the like.
- sugar chains include M3 'M5A' Hybrid (monoagalacto, bisect) -NAl
- glycoconjugate is a generic term for in vivo macromolecules having sugar chains.
- the glycoconjugates of the present invention include glycoproteins (including glycopeptides), proteodaricans, and glycolipids.
- the proteins that interact with sugar chains of the present invention include peptides that interact with sugar chains. Is also included.
- Examples of the protein that interacts with the sugar chain of the present invention include lectin, an enzyme protein having a sugar binding domain, a cytokinin having affinity for the sugar chain, a mutant thereof, or an antibody that interacts with the sugar chain. And the like.
- the lectins include lectins belonging to various molecular families obtained from animals, plants, fungi, bacteria, viruses, etc., ie, ricin B chain-related “R-type lectins found in all living organisms including bacteria.
- Canexin 'calreticulin which is present in eukaryotes in general and is involved in glycoprotein folding, and calcium, which is widely present in multicellular animals and is rich in typical lectins such as” selectin "and” collectin " Requirement "C-type lectin", “Galectin” which is widely distributed in the animal kingdom and has specificity for galactose, "Legume lectin” which forms a large family in leguminous plants, and animals with structural similarity “L-type lectin” involved in intracellular trafficking, “P-type lectin with mannose 6-phosphate binding involved in intracellular transport of lysosomal enzymes”, glycosaminodali “Annexin”, which binds to acidic sugar chains such as cans, and “I-type lectin,” which belongs to the immunoglobulin superfamily and includes “Siglec”
- lectins include ACA (Senninko lectin) ⁇ BPL (Purple bean lectin) 'ConA (Pork bean lectin)' DBA (Horsegram lectin) ⁇ DSA (Yoshichi sensual asaga lectin) 'ECA (D Sesame lectin) 'EEL (Spindle Tree lectin).
- GNA Yukinohana lectin
- GSL I Glypho-bean lectin
- GSL II Glypho-bean lectin
- HHL Amarilis lectin
- LBA Lia bean lectin
- LEL LEL
- Tomato lectin 'LTL
- PHA-L Pink bean lectin
- Peanut lectin PWM
- Pink pokeweed lectin RCA120 (French bean lectin)' SBA
- Examples of the enzyme protein having the sugar-binding domain include various glycosidases (xylanase, glucanase) and glycosyltransferases (UDP-GalNA polypeptide GalNAc transferase).
- examples of cytokins having affinity for sugar chains include interleukin-2 (IL-2), interleukin-12 (IL-12), tumor necrosis factor ⁇ (TNF-a), fibroblast growth factor. (FGF) and the like.
- Antibodies that interact with sugar chains include sugar chain-related tumor markers (CA19-9, Forssman antigen, T antigen, Tn antigen, sialyl ⁇ antigen), blood group-related sugar chains (A, ⁇ , ⁇ , Le a, Le x antigens), such as an antibody against differentiation associated antigens (Ii, SSEA-1-4) can be exemplified.
- sugar chain-related tumor markers CA19-9, Forssman antigen, T antigen, Tn antigen, sialyl ⁇ antigen
- A ⁇ , ⁇ , Le a, Le x antigens
- Ii differentiation associated antigens
- the substrate in the present invention is exemplified by glass, quartz glass, synthetic quartz glass, and the like. However, the substrate is not limited thereto.
- the substrate on which a protein that interacts with a sugar chain is immobilized is preferably immobilized on a substrate coated with a compound having an epoxy group as an active group. Substrate.
- Examples of the compound having an epoxy group as an active group include, but are not limited to, 3-glycidoxypropyltrimethoxysilane (GTMS).
- GTMS 3-glycidoxypropyltrimethoxysilane
- the substrate of the present invention on which a protein that interacts with a sugar chain is immobilized can be prepared by the following method.
- a substrate is coated with a compound having an epoxy group as an active group.
- GTMS is used as a compound having an epoxy group as an active group
- it can be carried out by the method described in Examples. Specifically, a slide glass is immersed in a 10% KOH I MeOH solution, and the container is shaken and left for 1 hour to treat the glass surface, and this is washed with a sufficient amount of purified water (Milli Q water). After drying, dry in an oven at 60 ° C. Then slide glass 2% Immerse in GTMS acetone solution and react for 1 hour while shaking the whole container under light shielding.
- GTMS alkoxysilyl groups are hydrolyzed with water to form silanol groups.
- the silanol groups are unstable and are partially bonded to form oligomers with the lapse of time.
- Adsorbs adsorbently After the reaction, dry the slide glass in an oven at 110 ° C for 8 hours. By the drying treatment, a silanol group on the glass surface reacts with a dehydration-condensation reaction to form a strong covalent bond.
- Figure 3 shows a series of GTMS coating methods.
- a protein that interacts with a sugar chain is immobilized on a substrate coated with a compound having an epoxy group as an active group. Immobilization of proteins that interact with sugar chains is performed by covalent bonds. Specifically, a compound having an amino group as an active group is spotted on the substrate and allowed to react to perform immobilization. As a spotter, STAMPMAN manufactured by Nippon Laser Electronics Co., Ltd. can be used.
- the concentration of spotted lectin is not particularly limited, but is preferably 1 mgZmL or more. More preferably, after the spot treatment, unbound lectin can be removed by washing with a PBS solution containing Tween20 (PBST).
- the substrate on which the protein that interacts with the sugar chain is immobilized is preferably a substrate in which a plurality of reaction vessels are formed. More preferably, it is a substrate in which a plurality of reaction vessels are formed by sticking rubber having a plurality of holes.
- an 8-hole rubber designed and developed by the present inventors is attached to a predetermined position on a slide glass on which a protein interacting with a sugar chain is immobilized. Then, eight reactors are prepared. This 8-hole rubber has eight rectangular holes regularly, and can form eight reaction tanks when attached to a slide glass.
- reaction tank By filling this reaction tank with a fluorescently labeled probe solution, it becomes possible to smoothly carry out contact with a protein that interacts with a sugar chain.
- This reaction tank is not limited to 8-hole rubber.
- a reaction field can be formed by applying a water-repellent coating to a non-spot area on the glass surface. More preferably, many reaction fields are formed.
- proteins interacting with a plurality of types of sugar chains can be spotted and used on the same substrate.
- the protein that interacts with the sugar chain is immobilized on the substrate on which the protein is immobilized.
- the fluorescently labeled test sugar chain or test glycoconjugate is contacted.
- a fluorescent labeling agent for a test sugar chain or a test glycoconjugate a fluorescent color having a 2-aminopyridine, Cy3, Cy3.5, Cy5, tetramethylrhodamine, or fluorescein skeleton is used.
- fluorescent color having a 2-aminopyridine, Cy3, Cy3.5, Cy5, tetramethylrhodamine, or fluorescein skeleton is used.
- examples thereof include various dyes, a fluorescent dye Alexa series manufactured by Molecular Probes, and a quantum dot fluorescent dye, but are not limited to these as long as they have a property of fluorescently labeling a sugar chain.
- test sugar chain or test glycoconjugate can be directly or indirectly fluorescently labeled.
- the test sugar chain can be indirectly fluorescently labeled by binding a protein that interacts with the test sugar chain and the sugar chain that has been fluorescently labeled in advance.
- a protein that has been fluorescently labeled in advance and that interacts with a portion other than the sugar chain of the test glycoconjugate for example, an antibody that interacts with a portion other than the sugar chain of the test glycoconjugate
- the test glycoconjugate can be indirectly fluorescently labeled with the test glycoconjugate.
- the test glycoconjugate can also be indirectly fluorescently labeled by binding the test glycoconjugate to a protein that is fluorescently labeled in advance and that interacts with the sugar chain.
- a protein that is fluorescently labeled in advance and that interacts with the sugar chain.
- sugar chains other than the sugar chain to which the protein interacting with the sugar chain is bound bind to the substrate).
- an antibody that has been fluorescently labeled in advance and that interacts with a portion other than the sugar chain of the target glycoconjugate can be used as a sample including a target glycoconjugate sample, blood, body fluid, biological extract components, food components, etc.
- the fluorescent glycolabel can be selectively labeled without separating and purifying the target glycoconjugate.
- a crude sample on which the above-mentioned antibody, which has been fluorescently labeled in advance has acted, for example, on a substrate on which lectin is immobilized, only the sugar chain information of the target glycoconjugate can be selectively observed.
- the interaction of the test sugar chain or the test complex carbohydrate with the protein that interacts with each sugar chain is then performed by applying excitation light without washing the substrate. Measure.
- the present inventors have solved the above problem by measuring the intensity of fluorescence excited by the action of excitation light without washing the probe solution. More specifically, this is a measurement method in which excitation light is incident on a surface of the substrate that is not fixed and the excited fluorescence is detected.
- the excitation light in the present invention include a light source cut out from white light, which is not particularly limited, preferably a laser light having a single wavelength power, and more preferably an evanescent wave.
- white light which is not particularly limited, preferably a laser light having a single wavelength power, and more preferably an evanescent wave.
- evanescent light when the excitation light is totally reflected inside the glass, a weak light called evanescent light falls within a range of 200 to 300 nm (about half the excitation wavelength) from the interface.
- the evanescent light excites the excitation light while the solution containing the probe molecules is in contact with the slide glass. It is possible to selectively observe the probe molecules that participate in the binding reaction without almost exciting the probe molecules.
- the method of the present invention can be used for sugar chain structure analysis utilizing the interaction between a fluorescently labeled test sugar chain and a protein that interacts with a sugar chain immobilized on a substrate. That is, the method of the present invention is expected to be applied as a sugar chain profiler for performing sugar chain structure analysis quickly and easily. For example, the profiling method described in “Protein Nucleic Acid Enzyme, August 2003 Special Issue, Vol. 48, NO. 11” can be applied.
- the present invention is applicable to a sugar chain structure analysis system using a computer.
- the structure of the test sugar chain can be identified, and when the test sugar chain has an unknown structure, Even if there is a characteristic structure existing in the test sugar chain ( ⁇ 2-3 sialic acid ' ⁇ 2-6 sialic acid' oc 1-3 galactose ' ⁇ 1-3 fucose' a 1-6 fucose 'bisect It is possible to point out the prediction of N-acetyldarcosamine (sulfation, etc.) or the similarity with known structural sugar chains. In this system, various proteins that interact with a sugar chain contacted with a fluorescently labeled test sugar chain are obtained.
- the system of the present invention can also automate the step of bringing a fluorescently labeled test sugar chain into contact with a substrate on which various proteins interacting with sugar chains are immobilized.
- the solution contact process can be controlled centrally.
- the system of the present invention can also be combined with mass spectrometry and enzymatic digestion, and these methods are very useful because more reliable data can be obtained.
- FIG. 1 shows an example of a system configuration diagram of the present invention.
- a system using a microarray scanner is composed of the following components.
- a storage means in which information on the interaction of a plurality of sugar chains with various proteins interacting with the sugar chains is stored.
- a fluorescently labeled test sugar chain is brought into contact with a substrate on which various proteins interacting with sugar chains are immobilized, and excitation light is incident on the substrate without performing a washing operation.
- a computer including a calculating means for comparing the combination information of the detected fluorescence intensities with the information stored in (a) and selecting one or a plurality of sugar chains of known structures having a matching combination information pattern.
- FIG. 2 shows an example of a computer configuration diagram in the system of the present invention.
- Input means 1 and output means 2 are connected to bus line 3.
- the temporary storage means 4 stores the entered information, And the calculated information are temporarily stored.
- the central processing unit (CPU) 5 performs various operations in response to instructions of the program of the present invention.
- the storage means (database) 7 stores information on the interaction of a plurality of sugar chains with various proteins that interact with the sugar chain, and information on Z or a combination pattern of the interaction information.
- interaction information fluorescence intensity information obtained by a method or system using the microarray scanner device of the present invention, or information obtained from various experimental systems established so far can be used.
- the storage means 6 stores various programs including a program for executing the processing of the present invention.
- the program for executing the process of the present invention stores the input information on the combination of the input fluorescence intensities in a database and stores the information on the interaction of a plurality of sugar chains with various proteins that interact with the sugar chains.
- At least the program 63 is included.
- the values of the combination information of the interaction information may be compared with each other.
- the program 61 compares, for example, the value of the combination information of the input fluorescence intensity with the value of the combination information of the interaction information stored in the database, and determines the sugar chain having a known structure based on the closeness of the value. The ability to select one or more is built-in.
- the combination information of the interaction information may be patterned to compare the patterns.
- the storage means 6 stores the program 61-1 for patterning the input information of the combination of the input fluorescence intensities and the sugar stored in the database.
- a program 61-2 for patterning combination information of interaction information of a plurality of sugar chains with various proteins that interact with chains, and a pattern of combination information of input fluorescence intensities are stored in a database. Structure that matches the combination information pattern with the combination information pattern of multiple sugar chain interaction information for various proteins that interact with sugar chains
- a program 61-3 for connecting one and two or more known sugar chains is stored.
- the interaction information is divided into levels within the threshold range and coded (for each level, for example, a different Function to apply numbers and different colors).
- the program 61-3 compares the pattern obtained by executing the program 61-1 with the pattern obtained by executing the program 61-2, and finds a sugar chain having a known structure having a matching combination information pattern. One or more programs to select. If the pattern information is stored in the database, the program 61-3 compares the pattern obtained by executing the program 61-1 with the pattern stored in the database, and the pattern matches. Select one or more sugar chains with known structures. Program 61-3 incorporates, for example, a function to compare the code of a sugar chain with a known structure with the code of a sugar chain to be tested and to select a sugar chain with a known structure whose code matches that of the sugar chain to be tested! / Puru.
- the program 62 performs, for example, display of fluorescence intensity information, display of interaction information, display of selected sugar chain information having a known structure, and the like.
- the flow of the processing performed by the system of the present invention first, various proteins that interact with the sugar chains that have been brought into contact with the fluorescently labeled test sugar chains are immobilized.
- the substrate is set on the microarray scanner device, excitation light is incident on the substrate, and the intensity of the excited fluorescence is detected.
- the plurality of substrates are automatically and sequentially fixed to the detection unit, and scanning is performed.
- the fluorescence intensity information is automatically input to the computer.
- the input information can be stored in a storage unit or a temporary storage unit of the computer. Further, the fluorescence intensity information may be stored in a database.
- arithmetic means such as a central processing unit (CPU) receives an instruction of the program 62 in the storage means, reads out the fluorescence intensity information stored in the storage means or the temporary storage means, and reads the fluorescence intensity information.
- Information can also be displayed. For example, display the corrected value of the brightness value of each spot based on the fluorescence intensity emitted from a protein sample spot (internal standard spot) that interacts with a sugar chain, which serves as a reference whose properties have been thoroughly investigated in advance.
- the internal standard spot may be plural.
- the combination information of the input fluorescence intensities is then converted to the information on the interaction of a plurality of sugar chains with various proteins that interact with the sugar chains stored in the database.
- arithmetic means such as a central processing unit (CPU) receives a command of the program 61 in the storage means, and stores the combination information of the fluorescence intensity stored in the storage means or the temporary storage means and the database.
- CPU central processing unit
- Reads the combination information of the interaction information of multiple sugar chains for various proteins that interact with the existing sugar chain collates each combination information, and finds a sugar chain with a known structure that matches the combination information pattern.
- the selected sugar chain information of known structure can be stored in a storage means or a temporary storage means of a computer.
- arithmetic means such as a central processing unit (CPU) receives instructions from the program 61 in the storage means, and performs various operations to interact with sugar chains stored in the database.
- the combination information of the interaction information of a plurality of sugar chains with the protein is input to the computer, the combination information of the fluorescence intensities stored in the storage means or the temporary storage means is read, and the respective combination information is collated. Select one or more sugar chains with known structures.
- the selection result is displayed by the display means.
- the arithmetic means such as a central processing unit (CPU) receives a command from the program 62 in the storage means, and receives the information on the sugar chain of known structure stored in the storage means or the temporary storage means. Is read and displayed.
- CPU central processing unit
- the present invention provides a step of bringing a protein having an interaction with a fluorescently-labeled sugar chain into contact with a substrate on which a test glycoconjugate is immobilized, and a step of applying excitation light without washing the substrate. And a method for analyzing the interaction between a protein that interacts with a sugar chain and the sugar chain, comprising a step of measuring the intensity of the excited fluorescence.
- the substrate on which the test glycoconjugate is immobilized is preferably a substrate on which the test glycoconjugate is immobilized on a substrate coated with a compound having an epoxy group as an active group. More preferably, the substrate is a GTMS compound having an epoxy group as an active group.
- a step is the same as the above-described method.
- the glycosylation status of a test glycoconjugate immobilized on a substrate is examined using a fluorescent-labeled lectin or the like. This is useful as a means of examining the situation at once for a group of proteins (glycoform analysis). It is also expected to be applied to quality control checks of sugar chains in protein preparations.
- the present invention also provides a step of bringing a test glycoconjugate into contact with a substrate on which a protein that interacts with a region other than the sugar chain of the glycoconjugate is immobilized.
- the method includes the steps of contacting a protein that interacts with a fluorescently labeled sugar chain, and measuring the intensity of the excited fluorescence by applying excitation light without washing the substrate.
- Provided is a method for analyzing the interaction between a protein having an action and a sugar chain.
- the substrate on which the test glycoconjugate is immobilized is preferably a substrate on which the test glycoconjugate is immobilized on a substrate coated with a compound having an epoxy group as an active group. More preferably, the substrate is a GTMS compound having an epoxy group as an active group.
- the protein that interacts with a region other than the sugar chain of the glycoconjugate according to the present invention is preferably an antibody that interacts with a region other than the sugar chain of the glycoconjugate.
- the protein that interacts with a sugar chain is preferably a lectin, an enzyme protein having a sugar binding domain, a cytokin with affinity for a sugar chain, a mutant thereof, or an antibody that interacts with a sugar chain. It is.
- the method includes a step of bringing a protein that interacts with a fluorescently labeled sugar chain into contact with a substrate, which has been brought into contact with a glycoconjugate to be tested.
- a sample containing a test complex carbohydrate sample, blood, a body fluid, a biological extract component, and a food on which a protein that interacts with a region other than the sugar chain of the complex carbohydrate is immobilized.
- Contact the stock solution or diluted solution of the components, etc. and ensure sufficient reaction time.
- wash thoroughly with PBS or PBST to remove components other than the test glycoconjugate.
- the sugar chain portion can be contacted with a fluorescently labeled probe solution exhibiting an interaction.
- the present invention is useful as a method for quickly and easily examining the state of sugar chain modification of a target protein from a mixture of different glycoconjugates, such as blood, body fluids, biological extract components, and food components. By observing the status of glycosylation of the target protein without purifying a mixed solution of various components such as undiluted solution or diluted solution, it can be applied in fields such as diagnosis and grasping the treatment status. Conceivable.
- the present invention provides (a) a step of coating a substrate with a compound having an epoxy group as an active group, and (b) a protein that interacts with a sugar chain on the substrate obtained in step (a), or Provided is a method for producing a substrate, comprising a step of immobilizing a protein that interacts with a region other than the sugar chain of a glycoconjugate. The steps of the method are described in detail above.
- the present invention also provides a substrate manufactured by the above method.
- the present invention provides a substrate coated with a compound having an epoxy group as an active group, which interacts with a protein that interacts with a sugar chain or a region other than the sugar chain of a glycoconjugate.
- a substrate on which the protein is immobilized is provided.
- the substrate of the present invention is preferably a substrate made of 3-glycidoxypropyltrimethoxysilane (GTMS) having an epoxy group as an active group.
- GTMS 3-glycidoxypropyltrimethoxysilane
- a protein that interacts with a region other than the sugar chain of the glycoconjugate is a substrate that is an antibody that interacts with a region other than the sugar chain of the glycoconjugate, or interacts with the sugar chain.
- the substrate is a lectin, an enzyme protein having a sugar-binding domain, a cytoforce having affinity for a sugar chain, a mutant thereof, or an antibody that interacts with the sugar chain.
- the concentration of spotted lectin is not particularly limited, but is preferably 1 mgZmL or more. More preferably, it is washed with PBST. Thus, the lectin is immobilized on the substrate.
- the substrate of the present invention is preferably a substrate in which a plurality of reaction vessels are formed.
- Asaguchi fetuin Asaguchi fetuin (SIGMA, ASF) is used as a fluorescent dye with a maximum absorption wavelength around 550 nm, Cy3 Mono-reactive Dye (Amersham Pharmacia, Cy3). And prepared by fluorescent labeling.
- ASF has three N-linked sugar chains and three 0-linked sugar chains in the molecule, and has a sugar chain structure in which the sialic acid cap at the non-reducing end of the sugar chain is partially removed. It is known that ASF was prepared in 0.1 M carbonate buffer (pH 9.3) to a final concentration of 1 mg / mL, and 1 mL was mixed with 1.0 mg of Cy3 powder, and reacted for 1 hour in a dark place with appropriate stirring. .
- Lectin was immobilized on the glass surface using a glass slide (Fig. 3) coated with 3-glycidoxypropyltrimethoxysilane having an epoxy group as an active group (Shin-Etsu Silicone Co., Ltd., hereinafter GTMS).
- GTMS coating was performed by the following procedure using a slide glass manufactured by Matsunami Glass Industry Co., Ltd. The slide glass was immersed in a 10% KOH I MeOH solution and left standing for 1 hour while shaking the whole container to treat the glass surface. This was washed with a sufficient amount of purified water (milli-Q water), and then dried in an oven at 60 ° C.
- the slide glass was immersed in a 2% GTMS acetone solution, and allowed to react for 1 hour while shaking the whole container under light shielding. Anti After the reaction, the resultant was dried in an oven at 110 ° C for 8 hours, washed with a sufficient amount of purified water, and dried.
- Lectin was spotted on the slide glass coated with GTMS of (2).
- GTMS GTMS
- a STAMPMAN made by Nippon Laser Electronics Co., Ltd. as a microarray spotter
- spots with a diameter of about 0.6-0.7 mm were placed on the slide glass by using a stamp pin with a tip diameter of 0.40 mm.
- Each spotted lectin was dissolved in phosphate buffered saline, pH 7.4 (PBS) to a concentration of 1 mg / mL (partially 0.25 mg / mL for some lectins). This was dispensed 10 times into each reaction tank of a 96-well microtiter plate for PCR (Corning) and set in a microarray spotter.
- PBS phosphate buffered saline, pH 7.4
- stamp pin operation program was executed.
- the stamp pin was immersed in an immobilized sample solution in a 96-well PCR microtiter plate for 1 second, lifted up, and brought into contact with a predetermined position on the surface of the slide glass for 1 second. This operation was repeated for each spot, and the same sample solution force was spotted at four points in a row, and then the stamp pin cleaning process was performed.
- the tip of the stamp pin is dipped in a 0.05% SDS solution for 2 seconds, the stamp pin is dried in a vacuum device for 15 seconds, further dipped in purified water for 2 seconds, dried in a vacuum device for 15 seconds, and finally It was immersed in ethanol for 2 seconds and dried for 15 seconds in a vacuum device.
- lectins having various sugar-binding specificities RCA120, SSA, xylan-binding domain of xylanase derived from recombinant actinomycetes (hereinafter referred to as XBD), C-terminal domain derived from recombinant earthworm 29 kDa lectin (A total of 5 proteins were spotted: EW29 (Ch) below) and one negative control (PB serum albumin (BSA)) RCA120 and BSA purchased from SIGMA, SSA from Seikagaku The purchased and XBD, EW29 (Ch) were expressed in Escherichia coli and purified in our laboratory.
- XBD xylan-binding domain of xylanase derived from recombinant actinomycetes
- BSA PB serum albumin
- An eight-hole rubber designed and developed by the present inventors was attached to predetermined positions on the slide glass after the lectin immobilization, thereby producing eight reaction vessels (Fig. 4).
- This 8-hole rubber is made of black silicone rubber with a thickness of 1 mm, and has 8 rectangular holes measuring 9.5 x 7.5 mm, which form 8 reaction vessels when attached to a slide glass. can do. If about 50 L of sample is added to this reactor, the inside can be filled with a sufficient amount of sample solution.
- the blocking solution on the slide glass was removed, and the plate was sufficiently washed with PBS, and then water was removed.
- the following operation was carried out as soon as possible to prevent denaturation of the protein due to drying of the glass surface and increase in the background due to drying.
- a fluorescence-labeled dani-glycoprotein probe solution to be analyzed for interaction was added to the reaction tank on the lectin-immobilized slide glass prepared in (4).
- the fluorescence-labeled glycoprotein probe was prepared by dissolving it in PBS to a final concentration of 10 g / mL, and 50 ⁇ L was dropped into each reaction tank.
- excitation light was injected from the end surface of the slide glass using the GTMAS Scan III (Nippon Laser Electronics), an evanescent excitation type microarray scanner. Then, the fluorescence generated by the excitation was detected by an ICCD (Charge Coupled Device with Image Intensifier) camera provided on the lower surface of the slide glass. Scanning the fluorescence image on almost the entire surface of the slide glass The image was saved in TIFF file format (about 100 MB per page). The parameters for scanning were unified with a gain of 5,000 times, an integration count of 4 times, and an exposure time of 33 msec.
- GTMAS Scan III Nippon Laser Electronics
- ICCD Charge Coupled Device with Image Intensifier
- Array-Pro Analyzer (.version 4.0 for Windows (registered trademark), Media Cybernetics), which is a commercially available analysis software for microarrays, was used for digitizing the scanning images.
- the brightness of each spot was calculated using the above analysis software, and the brightness of the non-spot area was set as a background value.
- the value obtained by subtracting the background value from the brightness of each spot was used as the net brightness value, and the average value and standard deviation were calculated for each spot from the same sample arranged in four rows.
- the performance of the GTMS-coated slide glass manufactured as described above was compared and evaluated with existing slide glasses (six types). That is, lectins (100 ⁇ g / mL) previously labeled with Cy3 were immobilized in an array on each surface-coated slide glass. (3) After passing through step (6), the brightness value of the spotting area was determined. The S / N ratio was calculated from (S) and the brightness value (N) of the non-spotting surface. As a result, as shown in Table 1, the brightness value of the GTMS-coated slide glass manufactured in the process (2) was only about one-half that of the glass slide A, which showed the highest value. Therefore, the S / N was 16.1, which was the best value among the slide glasses evaluated this time.
- RCA120 and ConA are typical lectins known to have high affinity for complex type sugar chains and high mannose type sugar chains, respectively. These lectins were prepared at various concentrations, and the same sample was spotted in an array by arranging four points horizontally. After 10 L / L of Cy3-ASF was applied to each reaction vessel of the array to cause a binding reaction, fluorescence was observed with a scanner.
- ASF has three N-linked sugar chains and three 0-linked sugar chains in the molecule, and the sialic acid cap at the non-reducing end of the sugar chain is released, and the ratatosamine structure protrudes. It is known to have a modified sugar chain structure. Therefore, it was expected that RCA120 had a very strong affinity and ConA had a weak affinity in the experimental system in which Cy3-ASF was added to the lectin array on which RCA120 and ConA were immobilized.
- Glycan-related arrays include lectin arrays using sugar chains as probes, lectin arrays using glycoproteins as probes, glycopeptide arrays using lectins as probes, glycoprotein arrays using lectins as probes, and lectins as probes. There are five types of antibody arrays used.
- FIG. 9 shows a schematic diagram of the interaction between each sugar chain-related array and the sugar chain.
- the fluorescence intensity information obtained using each array is encoded.
- the value of the luminance value is a value fetched in 16 bits, so it is a value between 0 and 65355. Therefore, coding was performed from 0 to 5 by classifying the value of (brightness value-background value) at a gain of "1000 times" into six steps in increments of 10,000. If the luminance signal value is saturated at Gain “1000 times”, Observe with the gain lowered, and convert it to the value when the gain is 1000 times. Whether the signal value is saturated or not is determined by whether the linearity of the correlation between the gain value and the signal strength is maintained when the gain value is changed.
- lectins having various sugar-binding specificities as lectins immobilized on the lectin array.
- a protein BSA which did not bind to a sugar chain was selected.
- GNA and SNA were purchased from VECTOR
- BSA was purchased from SIGMA
- RCA120, ECA, ConA and SSA were purchased from Seikagaku Corporation.
- the model fluorescence-labeled dani-sugar protein probes include ASF, FET, ribonuclease B (RNase B) derived from sac spleen, and proteins such as ribonuclease (RNase A) derived from sac spleen as a negative control. (All purchased from SIGMA) was prepared by fluorescent labeling using Cy3 Mono-reactive Dye (Amersham Pharmacia, hereinafter Cy3), a fluorescent dye having an absorption maximum wavelength around 550 nm.
- Lectin was immobilized on the glass surface using a glass slide (Fig. 3) coated with 3-glycidoxypropyltrimethoxysilane having an epoxy group as an active group (Shin-Etsu Silicone Co., Ltd., hereinafter GTMS).
- GTMS coating was performed by the following procedure using a slide glass manufactured by Matsunami Glass Industry Co., Ltd. The slide glass was immersed in a 10% KOH I MeOH solution and left standing for 1 hour while shaking the whole container to treat the glass surface. This was washed with a sufficient amount of purified water (milli-Q water), and then dried in an oven at 60 ° C.
- the slide glass was immersed in a 2% GTMS acetone solution, and allowed to react for 1 hour while shaking the whole container under light shielding. After the reaction, the resultant was dried in an oven at 110 ° C. for 8 hours, washed with a sufficient amount of purified water, and dried.
- Lectin was spotted on the GTMS-coated slide glass prepared in (2) to prepare a lectin array.
- a stamp pin having a tip diameter of 0.40 mm was used, and a spot having a diameter of about 0.5 mm was arranged on a slide glass. The following conditions were recorded on the computer attached to the microarray spotter when the lectin was fixed to the slide glass, and the stamp pin operation program was executed.
- the stamp pin was immersed in the immobilized sample solution in a 96-well PCR microtiter plate for 1 second, lifted up by bow I, and brought into contact with a predetermined position on the surface of the slide glass for 1 second. While repeating this operation for each spot, six spots were spotted in one horizontal row from the same sample solution, and then the stamp pins were washed.
- the tip of the stamp pin is immersed in a 0.05% SDS solution for 2 seconds, the stamp pin is dried in a vacuum device for 15 seconds, further immersed in purified water for 2 seconds, dried in a vacuum device for 15 seconds, and finally It was immersed in ethanol for 2 seconds and dried in a force vacuum device for 15 seconds.
- the probe solution was brought into contact with the array by adding 50 L of each fluorescence-labeled iridose protein probe solution adjusted to about 100 ng / mL to each reaction tank to the slide after blocking.
- excitation light is injected from the end surface of the slide glass using the GTMAS Scan III (Nippon Laser Electronics), an evanescent excitation type microarray scanner. Then, the fluorescence generated by the excitation was detected by an ICCD (Charge Coupled Device with Image Intensifier) camera provided on the lower surface of the slide glass. After scanning the fluorescent image of almost the entire surface of the slide glass, the obtained image was saved in the TIFF file format. The parameters at the time of scanning were unified with a gain of "4000 times", an integration number of "8 times”, and an exposure time of "110 msec".
- Array-Pro Analyzer Ver. 4.5 Media Cybernetics
- the brightness of each spot was calculated by the above analysis software, and the brightness of the non-spot area was set as a background value.
- the value obtained by subtracting the background value from the brightness of each spot was used as the net brightness value, and the average value and standard deviation were calculated for each spot from the same sample arranged in five rows.
- this Cy3_ASF was fragmented by trypsin treatment to prepare a Cy3-ASF peptide.
- Example 3 was carried out by the method described in (2).
- the lectins to be immobilized are grouped according to the major sugar recognition ability of each lectin, and then 5 types of fucose recognition lectins, 6 types of sialic acid recognition lectins, 3 types of ratatosamine structure recognition lectins, and 3 types of galactose recognition lectins Six kinds, 11 kinds of galactosamine recognition lectins, 4 kinds of mannose recognition lectins, and 5 kinds of chitin structure recognition lectins, a total of 40 kinds of lectins were selected, and an array immobilized on a slide glass was prepared. The experimental operation was performed by the method described in Example 3 (3).
- RCA120 which strongly recognizes the ratatosamine structure, was used as a lectin probe
- BSA which has no sugar-binding ability
- Fluorescently labeled lectin probes were prepared by fluorescent labeling using the fluorescent dye Cy3. Lectin is dissolved in 0.1 M carbonate buffer (pH 9.3) to a final concentration of 1 mg / mL, mixed with 1.0 mg of Cy3 powder per 1 m, and reacted for 1 hour in a dark place with appropriate stirring. I let it. After the reaction, unreacted Cy3 dye was removed using an ultrafiltration filter kit.
- GTMS coated slides were performed by the method described in Example 5 (2).
- Glycopeptides were spotted on the GTMS-coated slide glass ( Figure 3) prepared in (2) to prepare a glycopeptide array.
- a spot having a diameter of about 0.5 mm was arranged on a slide glass by using a stamp pin having a tip diameter of 0.40 mm using a STAMPMAN manufactured by Nippon Laser Electronics Co., Ltd. as a microarray spotter.
- the immobilized glycopeptide sample was obtained by fragmenting the glycoprotein fraction purified using a mouse liver soluble fractional lectin column with trypsin, followed by peptide fragmentation.
- the glycopeptide fractionated by HPLC was used.
- the following conditions were stored in the computer attached to the microarray spotter, and the stamp pin operation program was executed.
- the stamp pin was immersed in a sample solution for fixing in a 96-well PCR microtiter plate for 1 second, then lifted up, and brought into contact with a predetermined position on the surface of the slide glass for 1 second. This operation was repeated for each spot, and after six spots were made in one horizontal row of the same sample solution force, the stamp pins were washed.
- the tip of the stamp pin was dipped in a 0.05% SDS solution for 2 seconds, the stamp pin was dried in a vacuum device for 15 seconds, further dipped in purified water for 2 seconds, dried in a vacuum device for 15 seconds, and finally washed. Immersed in ethanol for 2 seconds in a vacuum device A drying operation for 15 seconds was performed.
- Methods for preparing a glycopeptide array include 1) immobilizing purified glycopeptides, 2) immobilizing crude glycopeptides, and 3) immobilizing glycopeptide fractions separated by HPLC. It is possible. In this experiment, an array of fractions separated by HPLC could be prepared and proved to be useful.
- the state of glycosylation of the glycoprotein in the living body is analyzed.
- a method of observing the interaction between a lectin and a sugar chain in a solution in an equilibrium state for the first time has been put to practical use.
- This technique has an interaction like the traditional lectin plot. It is possible to obtain the information of the middle part that is not nothing (0 or 1), that is, the strength information of the connection from the luminance value (for example, from 0 to 6 steps).
- by preparing an array for lectin-sugar chain interaction analysis for various uses it can be used for diagnosis / determination from undiluted or diluted solutions such as blood, body fluids, tissue extracts, etc. The application to quality control of protein products is expected.
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US8008094B2 (en) | 2011-08-30 |
EP1710581A1 (en) | 2006-10-11 |
EP1710581A4 (en) | 2007-10-10 |
EP1710581B1 (en) | 2014-03-19 |
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