WO2012124609A1 - 糖鎖蛍光標識方法 - Google Patents
糖鎖蛍光標識方法 Download PDFInfo
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- WO2012124609A1 WO2012124609A1 PCT/JP2012/056011 JP2012056011W WO2012124609A1 WO 2012124609 A1 WO2012124609 A1 WO 2012124609A1 JP 2012056011 W JP2012056011 W JP 2012056011W WO 2012124609 A1 WO2012124609 A1 WO 2012124609A1
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- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
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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
- G01N33/66—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving blood sugars, e.g. galactose
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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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"
- G01N21/643—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" non-biological material
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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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- C09K2211/00—Chemical nature of organic luminescent or tenebrescent compounds
- C09K2211/14—Macromolecular compounds
- C09K2211/1408—Carbocyclic compounds
- C09K2211/1433—Carbocyclic compounds bridged by heteroatoms, e.g. N, P, Si or B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/88—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86
- G01N2030/8809—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86 analysis specially adapted for the sample
- G01N2030/8813—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86 analysis specially adapted for the sample biological materials
- G01N2030/8827—Integrated analysis systems specially adapted therefor, not covered by a single one of the groups G01N30/04 - G01N30/86 analysis specially adapted for the sample biological materials involving nucleic acids
Definitions
- the present invention relates to a sugar chain fluorescent labeling method for recovering, separating and purifying sugar chain molecules and fluorescently labeling them for measurement, and relates to a sugar chain capturing carrier for capturing sugar chain molecules and a method for labeling the sugar chains.
- sugar chain molecules have attracted attention as the third chain following nucleic acids and proteins.
- research on cell differentiation, canceration, immune reaction, fertilization, etc. has been conducted, and attempts to create new medicines and medical materials are continuing.
- sugar chains are receptors for many toxins, viruses, and bacteria, and are also attracting attention as cancer markers. In this field as well, we try to create new medicines and medical materials as well. Attempts continue.
- Sugar chains are analyzed by various methods such as an array method.
- HPLC and CE are widely used techniques from the viewpoints of good separation, good reproducibility, quantitativeness, high sensitivity, etc.
- the reducing end of the sugar chain is reduced to a reduced amino acid. It is necessary to label by the chemical method.
- purification and labeling of these sugar chains takes time and man-hours, and it is difficult to prepare a large amount of samples at once.
- Patent Documents 1, 2, and 3 Various methods for analyzing sugar chains by fluorescent labeling have been developed (for example, Patent Documents 1, 2, and 3).
- the labeling efficiency is not 100%, and sugar chains that are not labeled sugar chains are mixed in one sample. This situation does not pose a major problem when fluorescence detection is performed using HPLC or CE, but there is a problem that peaks are complicated when analyzing sugar chains by mass spectrometry.
- the labeling efficiency is poor, there is a possibility that the sensitivity is lowered in the analysis by HPLC or CE.
- An object of the present invention is to provide a method for easily and efficiently fluorescently labeling sugar chains.
- a method for fluorescently labeling sugar chains wherein a fluorescent substance composed of an aromatic amine having a concentration of 0.5 mol / L or more is reacted with a sugar chain for labeling. .
- the aromatic ring portion of the aromatic amine is a benzene ring, pyrene ring, naphthalene ring, acridone ring, fluorescein ring, dansyl ring, coumarin ring, acridine ring, or any derivative thereof
- the fluorescent substance having an aromatic amine is selected from the group consisting of 2-aminobenzoamide, 2-aminobenzoic acid, 8-aminopyrene-1,3,6-trisulfonate, 8-aminophosphorane-1,3,6-trisulfonate, 2-amino- 9 (10H) -acridone, 5-Aminofluorescein, dansylethylenediamine, 7-Amino-4-methylcoumarin, 3-Aminobenzoic acid, 7-Amino-1-naphthol, 3- (Acetylamino) -6-aminoamine, At least one kind selected from any derivative of fluorescent substance 5.
- R1 and R2 are hydrocarbon chains having 1 to 20 carbon atoms into which —O—, —S—, —NH—, —CO—, and —CONH— may be inserted;
- R3, R4, and R5 are H, CH 3 Or a hydrocarbon chain having 2 to 5 carbon atoms, m and n represent the number of monomer units.
- M and n have the same meaning as described above.
- (9) The sugar chain fluorescent labeling method according to any one of (1) to (8), wherein the sugar chain is a biological substance.
- (11) A kit used for the sugar chain fluorescent labeling method according to any one of (1) to (10).
- the present invention relates to a sugar chain labeling method for analyzing a sugar chain by HPLC or mass spectrometry.
- the sugar chain is captured and purified on a sugar chain capture carrier, and then the sugar chain is released and the sugar chain is labeled with a fluorescent substance.
- the present invention also relates to a kit used for the sugar chain labeling method of the present invention.
- a method for labeling sugar chains with a fluorescent reagent a method called reductive amination is generally used.
- Add a fluorescent reagent having an amino group to the sugar chain sample react the aldehyde group formed at the sugar chain reducing end with the amino group of the fluorescent reagent, and reduce the formed Schiff base with a reducing agent to reduce the sugar chain.
- a fluorescent label is introduced at the reducing end.
- the present invention was invented for the purpose of further increasing the yield of fluorescently labeled sugar chains by increasing the concentration of the fluorescent reagent and increasing the reaction opportunity.
- sugar chain used in the present invention is not particularly limited, and may be a biological substance such as blood, body fluid or tissue extract, or a sugar chain compound produced by chemical synthesis.
- sugar chain included is a sugar chain bound to any of a sugar amino acid, glycopeptide, glycoprotein, glycolipid, glycosaminoglycan, proteoglycan, glycosylphosphatidylinositol, peptidoglycan, and lipopolysaccharide, or free You can choose from sugar chains.
- sugar chain labeling examples include a method in which an aromatic amine is allowed to act and the sugar chain is bound to the labeling compound by a reductive amination reaction.
- the labeling reagent to be used is not particularly limited as long as it is an aromatic amine, but is preferably selected from the group consisting of the following substances containing an amino group.
- Examples include 2-Aminobenzoamide, 2-Aminobenzoic acid, 8-Aminopyrene-1,3,6-trisulfonate, 8-Aminophathalene-1,3,6-trisulphonate, 2-Amino9 (10H) -acridone, 5-Aminofluoresceine 7-Amino-4-methylcoumarin, 3-Aminobenzoic acid, 7-Amino-1-naphthol, 3- (Acetylamino) -6-aminoacidine, among which 2-aminobenzomide or 2-aminobenzoic acid is a reagent, Reactive It is effective from fecal.
- these derivatives are also preferably used.
- 2-aminobenzomide or 2-aminobenzoic acid is used as the aromatic amine, it is used at 0.35 mol / L under general conditions, but at a concentration of 0.5 mol / L or more, preferably 1.4 mol / L or more. By using it, the labeling efficiency can be improved. However, when the concentration exceeds 3 mol / L, it is difficult to remove the aromatic amine that has not been used in the reaction, so the most preferable concentration is 1.4 mol / L or more and 3 mol / L or less.
- the liquid volume when particles are used as a carrier for capturing sugar chains, the liquid volume is usually enough to soak the particles, for example, 50 ⁇ L for 5 mg of particles, but the volume is doubled to 100 ⁇ L Thus, the labeling efficiency can be increased. Although the liquid volume may exceed 100 ⁇ L, it is difficult to remove the aromatic amine that has not been used in the reaction, so it is preferable to adjust it to between 100 ⁇ L and 200 ⁇ L for 5 mg particles. .
- sugar chains can be reacted in a liquid phase, but by using a sugar chain-trapping carrier described below, sugar chains can be purified, recovered, and labeled with a fluorescent reagent continuously.
- the sugar chain-trapping carrier is a carrier having a reactive primary amino group for capturing a sugar chain on its surface, and preferably has an oxylamino group or a hydrazide group as the primary amino. This is preferable because it can react with and bind to the aldehyde group which is the sugar chain reducing end even in the absence of an enzyme or a coupling reagent.
- the sugar chain-trapping carrier is preferably a particle having a structure represented by the following general formula [Chemical Formula 1].
- R1 and R2 are hydrocarbon chains having 1 to 20 carbon atoms into which —O—, —S—, —NH—, —CO—, and —CONH— may be inserted;
- R3, R4, and R5 are H, CH 3 Or a hydrocarbon chain having 2 to 5 carbon atoms, m and n represent the number of monomer units.
- the carrier is preferably a carrier insoluble in an aqueous solution or an organic solvent, and the material is not particularly limited, but glass or a resin excellent in organic solvent resistance such as silicon, polystyrene, ethylene, and the like. -Maleic anhydride copolymer, polymethyl methacrylate and the like can be selected.
- the carrier is preferably particles composed of a polymer matrix having a crosslinked polymer structure having a structure represented by the following general formula [Chemical Formula 2]. (M and n are the same as described above.)
- the form of the sugar chain-trapping carrier is not particularly limited, but is preferably in the form of particles or plates.
- a large number of samples may be processed at the same time, and in this case, continuous processing is possible by using a column packed with particles.
- a multiwell plate it is possible to process many samples simultaneously.
- a multiwell plate such as 6, 12, 24, 48, 96, 384 well can be used as appropriate.
- an inorganic substance can be used as the particle material.
- a particulate material can be used, and examples thereof include silica particles, alumina particles, glass particles, and metal particles.
- the organic polymer substance a polysaccharide gel typified by agarose or sepharose, or a polymer obtained by polymerizing a polymer of a vinyl compound can be used.
- the shape of the particles is preferably a sphere, and the particles preferably have an average particle size of 0.1 ⁇ m to 500 ⁇ m.
- the average particle diameter in this case is obtained by measuring the diameter of each particle observed in the optical microscope field of view. It is considered that the carrier particles having a particle size in such a range can be easily collected by centrifugation, a filter, and the like, and have a sufficient surface area, so that the reaction efficiency with sugar chains is high. When the particle size is significantly larger than the above range, the reaction efficiency with the sugar chain may be lowered due to the small surface area. In addition, when the particle size is significantly smaller than the above range, it may be difficult to collect the particles using a filter. Furthermore, when the particles are packed in a column and used, if the particle size is too small, the pressure loss at the time of liquid passage may increase.
- the sugar chain immobilized on the carrier is not particularly limited, but may be a sugar chain compound produced by chemical synthesis, even if it is a biological substance such as blood, body fluid or tissue extract. There may be.
- the sugar chain contained may be a free sugar chain or a sugar chain bound to any of a sugar amino acid, glycopeptide, glycoprotein, glycolipid, glycosaminoglycan, proteoglycan, glycosylphosphatidylinositol, peptidoglycan, and lipopolysaccharide. To be elected.
- the conditions for the binding reaction between the sugar chain reducing terminal and the primary amino group using the sugar chain-trapping carrier is that the pH is 2 to 7, the reaction temperature is 50 to 100 ° C., preferably 60 to 90 ° C., more preferably. Is 70 to 85 ° C., and the reaction time is 15 to 120 minutes.
- the most preferred conditions are pH 3-6, reaction temperature 80 ° C., reaction time 1 hour.
- the pH is less than 3 or more than 7
- the production of an imine that is an intermediate is slowed, and the capture efficiency is lowered.
- the reaction temperature is less than 50 ° C., the reaction efficiency may be remarkably deteriorated, and sugar chains cannot be sufficiently captured.
- the reaction is preferably carried out in an open system to completely evaporate the solvent.
- the purpose of this is to cause a sufficient reaction by infinitely concentrating the solution concentration as the solvent evaporates.
- the reaction temperature exceeds 90 ° C.
- the sugar chain itself is adversely affected, and when the carrier is a plastic, deformation and melting may occur depending on the type.
- the reaction time is shorter than 30 minutes, a sufficient binding reaction may not be obtained, and sugar chains cannot be captured sufficiently.
- the reaction exceeding 90 minutes does not show the effect of only taking time without further capturing of sugar chains.
- the sugar chain-trapping carrier It is necessary to wash the sugar chain-trapping carrier in a state where the sugar chain is captured in order to remove impurities.
- a solution used for the washing liquid alcohols such as methanol and ethanol; water and an aqueous buffer are used.
- the pH of the aqueous solution is preferably near neutral, and the pH is 4 to 10, more preferably 6 to 8.
- the carrier capturing the sugar chain can easily remove impurities other than the sugar chain in the purified raw material by washing, and only the sugar chain can be recovered together with the carrier.
- a cleaning method in the case of particles, the particles can be cleaned by immersing them in a cleaning solution and repeating the replacement of the cleaning solution.
- the particles are put into a centrifuge tube or a tube, a washing solution is added, and after shaking, the particles are precipitated by centrifugation and washed by repeating the operation of removing the supernatant.
- the particles can be washed by adding particles into a centrifuge tube, adding a washing solution, allowing the particles to settle naturally or by forcible sedimentation by centrifugation, and then removing the supernatant.
- the washing operation is preferably performed 3 to 6 times.
- the washing liquid can be simply washed by dispensing and sucking and removing in each well.
- you may use the centrifuge which can centrifuge a plate as needed.
- a filter tube which is a tube-shaped container and is equipped with a filter having a pore size which allows liquid permeation and does not allow the particles to permeate on the bottom surface.
- 6-384 multi-well plates with the filter attached to the bottom are commercially available, and high throughput can be achieved by using these plates.
- solution dispensing equipment, suction removal systems, and plate transport systems for example, Beckman Coulter's Biomek series
- plate transport systems for example, Beckman Coulter's Biomek series
- a series of operations may be performed.
- substances other than the sugar chain-trapping substance may be removed by filtration or centrifugation.
- the column may be filled with a sugar chain-trapping carrier, and the process from sugar chain-trapping reaction to labeling may be continuously processed in the column. Thereby, a large amount of sugar chains can be purified and labeled.
- Example 1> (Adjustment of sugar chain sample) 1 mg of bovine serum-derived IgG (SIGMA, I5506) was dissolved in 50 ⁇ L of 100 mM ammonium bicarbonate (Wako Pure Chemicals, 017-02875), then 5 ⁇ L of 120 mM DTT (dithiothreitol, SIGMA, D9779) was added at 60 ° C. The reaction was allowed for 30 minutes. After completion of the reaction, 10 ⁇ L of 123 mM IAA (iodoacetamide, Wako Pure Chemical, 093-02152) was added, and the mixture was allowed to react at room temperature for 1 hour in the dark.
- SIGMA bovine serum-derived IgG
- protease treatment was performed with 400 U of trypsin (SIGMA, T0303) to fragment the protein portion into peptides.
- the reaction solution was treated at 90 ° C. for 5 minutes and then treated with 5 U of glycosidase F (Roche, 1-365-193) to release sugar chains from the peptide, thereby obtaining a pretreated biological sample.
- sugar chain purification by sugar chain capture carrier The sugar chain solution 20 ⁇ L and 180 ⁇ L of 2% acetic acid / acetonitrile in a disposable column containing 5 mg of particles having a hydrazide group (BlotGlyco®), manufactured by Sumitomo Bakelite Co., Ltd., BS-45603), which is a carrier for capturing sugar chains.
- BlotGlyco® a hydrazide group
- the solution was added and reacted at 80 ° C. for 1 hour. The reaction was carried out in an open system, and it was visually confirmed that the solvent was completely evaporated and the particles were dried.
- Example 2 Preparation of a sugar chain sample, which is a process other than the sugar chain labeling process, purification of a sugar chain using a sugar chain capture carrier, removal of excess 2AB, and detection of a labeled sugar chain were performed in the same manner as in Example 1.
- Example 3 Preparation of a sugar chain sample, steps other than sugar chain labeling, purification of a sugar chain using a sugar chain capture carrier, removal of excess 2AB, and detection of a labeled sugar chain were performed in the same manner as in Example 1.
- Example 4 Preparation of a sugar chain sample, which is a process other than the sugar chain labeling process, purification of a sugar chain using a sugar chain capture carrier, removal of excess 2AB, and detection of a labeled sugar chain were performed in the same manner as in Example 1.
- ⁇ Comparative Example 1> Preparation of a sugar chain sample, which is a process other than the sugar chain labeling process, purification of a sugar chain using a sugar chain capture carrier, removal of excess 2AB, and detection of a labeled sugar chain were performed in the same manner as in Example 1.
- ⁇ Comparative Example 2> Preparation of a sugar chain sample, which is a process other than the sugar chain labeling process, purification of a sugar chain using a sugar chain capture carrier, removal of excess 2AB, and detection of a labeled sugar chain were performed in the same manner as in Example 1.
- FIG. 2 is a graph showing the total area of peaks obtained in Example 1, Example 2, Example 3 and Comparative Example 1.
- FIG. The peak area value obtained became larger as the concentration became higher than 0.35M which is generally used. Then, what plotted the total area of the peak obtained in Example 2, Example 4, and Comparative Example 2 is shown in FIG. The peak area value obtained became larger as the amount of the solution was larger than 50 ⁇ L. From the above results, after capturing and purifying the sugar chain using the sugar chain-trapping carrier, the sugar chain is released, and the released sugar chain has a high concentration (0.5 mol / L or more) composed of an aromatic amine. It has been clarified that the sugar chain fluorescent labeling method of the present application, in which a sugar chain is labeled with a fluorescent substance, has an excellent effect.
- sugar chains can be easily collected and purified, and sugar chains can be labeled with aromatic amines, thereby providing the sugar chains.
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Abstract
Description
本願は、2011年3月11日に、日本に出願された特願2011-053897号に基づき優先権を主張し、その内容をここに援用する。
また、糖鎖は多くの毒素、ウィルス及びバクテリアなどの受容体であり、また、癌のマーカーとしても注目されており、こちらの分野においても、同様に新たな医薬や医療材料を創製しようとする試みが続けられている。
(1)糖鎖を蛍光標識する方法であって、濃度が0.5mol/L以上の芳香族アミンで構成される蛍光物質と糖鎖を反応させ標識することを特徴とする糖鎖蛍光標識方法。
(2)芳香族アミンの芳香環部分が、ベンゼン環、ピレン環、ナフタレン環、アクリドン環、フルオレセイン環、ダンシル環、クマリン環、アクリジン環、またはこれらのいずれかの誘導体である、(1)に記載の糖鎖蛍光標識方法。
(3)芳香族アミンで構成される蛍光物質の励起波長が330~750nmである、(1)または(2)に記載の糖鎖蛍光標識方法。
(4)芳香族アミンで構成される蛍光物質の発光波長が420~780nmである、(1)~(3)のいずれか1項に記載の糖鎖蛍光標識方法。
(5)前記芳香族アミンを有する蛍光物質が、2-Aminobenzamide,2-Aminobenzoic acid,8-Aminopyrene-1,3,6-trisulfonate,8-Aminonaphthalene-1,3,6-trisulphonate,2-Amino-9(10H)-acridone,5-Aminofluorescein,Dansylethylenediamine,7-Amino-4-methylcoumarine,3-Aminobenzoic acid,7-Amino-1-naphthol,3-(Acetylamino)-6-aminoacridine、及び前記芳香族アミンを有する蛍光物質のいずれかの誘導体から選ばれる少なくとも一種類の蛍光物質である(1)~(4)のいずれか1項に記載の糖鎖蛍光標識方法。
(6)糖鎖捕捉担体を用いて糖鎖を捕捉、精製した後、前記糖鎖捕捉担体より糖鎖を遊離させ、遊離した糖鎖を前記芳香族アミンで構成される蛍光物質で糖鎖を標識するものである(1)~(5)のいずれか1項に記載の糖鎖の蛍光標識方法。
(7)前記糖鎖捕捉担体が下記の(化1)で表される構造を有するポリマー粒子である(6)に記載の糖鎖蛍光標識方法。
(8)前記糖鎖捕捉担体が下記の(化2)で表される構造を有するポリマー粒子である(6)または(7)に記載の糖鎖蛍光標識方法。
(9)前記糖鎖が、生体由来物質である(1)~(8)のいずれか1項に記載の糖鎖蛍光標識方法。
(10)前期糖鎖が、糖アミノ酸、糖ペプチド、糖タンパク質、糖脂質、グリコサミノグリカン、プロテオグリカン、グリコシルホスファチジルイノシトール、ペプチドグリカン、およびリポ多糖の中のいずれかに結合した糖鎖、または遊離の糖鎖である(1)~(9)のいずれか1項に記載の糖鎖蛍光標識方法。(11)(1)~(10)のいずれか1項に記載の糖鎖蛍光標識方法に用いられるキット。
本発明において用いる糖鎖は、特に限定するものではないが、血液、体液や組織抽出物などの生体由来物質でもあっても、化学合成により生成された糖鎖化合物であってもよい。
また、含まれる糖鎖が、糖アミノ酸、糖ペプチド、糖タンパク質、糖脂質、グリコサミノグリカン、プロテオグリカン、グリコシルホスファチジルイノシトール、ペプチドグリカン、およびリポ多糖の中のいずれかに結合した糖鎖、または遊離の糖鎖から選ぶことができる。
糖鎖を標識する方法としては、芳香族アミンを作用させて、還元アミノ化反応により糖鎖を前記標識化合物に結合させる方法が挙げられる。
例として2-Aminobenzamide,2-Aminobenzoic acid,8-Aminopyrene-1,3,6-trisulfonate,8-Aminonaphthalene-1,3,6-trisulphonate,2-Amino9(10H)-acridone,5-Aminofluorescein,Dansylethylenediamine,7-Amino-4-methylcoumarine,3-Aminobenzoic acid,7-Amino-1-naphthol,3-(Acetylamino)-6-aminoacridineが挙げられ、中でも2-aminobenzamideまたは2-aminobenzoic acidが、試薬としての入手、反応の簡便性から効果的である。また、標識試薬としての機能が維持される限りにおいて、これらの誘導体もまた好ましく用いられる。
具体的には、2-Aminobenzamideによる標識の場合、精製された糖鎖が入った反応容器に1.4 M 2-Aminobenzamid, 1 M sodium cyanoborohydrideの濃度になるように30%酢酸/ジメチルスルホキシド(DMSO)に溶解させた溶液100 μLを加え、30~70℃で1~10時間反応する事で達成される。
糖鎖は液相で反応させることも可能であるが、以下に説明する糖鎖捕捉担体を用いることにより、糖鎖の精製、回収、蛍光試薬による標識を連続的に行うことが可能となる。
前記糖鎖捕捉担体は、糖鎖を捕捉するための反応性の一級アミノ基をその表面に有する担体であり、前記一級アミノとしてオキシルアミノ基またはヒドラジド基を有することが望ましい。これは、酵素やカップリング試薬などの非存在下においても糖鎖還元末端であるアルデヒド基と反応し結合可能であるから好適である。
また、含まれる糖鎖は、遊離の糖鎖あるいは、糖アミノ酸、糖ペプチド、糖タンパク質、糖脂質、グリコサミノグリカン、プロテオグリカン、グリコシルホスファチジルイノシトール、ペプチドグリカン、リポ多糖のいずれかに結合した糖鎖から選ばれる。
前記糖鎖捕捉担体を用いた糖鎖還元末端と一級アミノ基の結合反応の条件の一具体例は、pHが2~7、反応温度が50~100℃、好ましくは60~90℃、より好ましくは70~85℃、反応時間が15~120分である。最も好ましい条件はpH3~6、反応温度が80℃、反応時間が1時間である。
pHが3未満、または7を越える場合は中間体であるイミン体の生成が遅くなるため、捕捉効率が落ちる。反応温度は、50℃未満の場合、反応効率が著しく悪化する場合があり、糖鎖を十分に捕捉することができない。反応は、開放系で行って溶媒を完全に蒸発させることが好ましい。これは、溶媒が蒸発するにつれて溶液濃度が無限濃縮されることにより十分な反応を起こさせることが目的である。
また、反応温度が90℃を超える場合は、糖鎖自身に悪影響を及ぼすと共に、担体がプラスチックの場合は種類によって変形、溶融を発生することがある。
反応時間が30分より短い場合は十分な結合反応が得られない場合があり、糖鎖を十分に捕捉することが出来ない。また90分を超えた反応は、更なる糖鎖の捕捉は見られず時間をかけただけの効果がない。
糖鎖を捕捉した状態の糖鎖捕捉担体は、夾雑物を取り除くために洗浄する必要がある。
ここで、洗浄液に用いられる溶液としては、メタノール、エタノールなどのアルコール類;水および水性緩衝液などが使用される。ここで、洗浄に水溶液が用いられる場合、この水溶液のpHは中性付近であることが好ましく、そのpHは4~10、より好ましくは6~8である。
前記の糖鎖を捕捉した担体は、洗浄により、精製原料中の糖鎖以外の夾雑物を簡単に除去することが可能で、糖鎖のみを担体ごと回収することができる。
洗浄方法としては、粒子の場合は、洗浄液に浸漬し、洗浄液の交換を繰り返すことで洗浄することができる。
例えば、遠心チューブ内に粒子を入れ、洗浄液を加え、粒子を自然沈降、または、遠心分離により強制的に沈降させた後、上清を除去する操作を繰り返すことで洗浄することができる。前記洗浄操作は3~6回行うことが好ましい。
プレートの場合は、各ウェル内に洗浄液を分注、吸引除去を繰り返すことで簡便に洗浄することができる。また、必要に応じてプレートを遠心可能な遠心分離機を用いても良い。
また、マルチプレートを用いた場合には、ろ過操作あるいは遠心操作により糖鎖捕捉物質以外の物質を除去してもよい。
(糖鎖サンプルの調整)
ウシ血清由来IgG(SIGMA、I5506)1 mgを100mM重炭酸アンモニウム(和光純薬、017-02875)50μLに溶解させた後、120mM DTT(ジチオスレイトール、SIGMA、D9779)を5μL加え、60℃で30分間反応させた。反応終了後、123mM IAA(ヨードアセトアミド、和光純薬、093-02152)10μLを加えて遮光下、室温で1時間反応させた。続いて400Uのトリプシン(SIGMA、T0303)によってプロテアーゼ処理をし、タンパク質部分をペプチド断片化した。反応溶液を90℃で5分処理した後、5UのグリコシダーゼF(Roche、1-365-193)による処理を行って糖鎖をペプチドから遊離させ、予備処理済の生体試料を得た。
糖鎖捕捉用の担体であるヒドラジド基を有する粒子5mg(BlotGlyco(R))、住友ベークライト株式会社製、BS-45603)が入ったディスポカラムに上記糖鎖溶液20μLおよび180μLの2%酢酸/アセトニトリル溶液を加え、80℃で1時間反応させた。反応は開放系で行い、溶媒が完全に蒸発し粒子が乾固した状態であることを目視で確認した。グアニジン溶液、水、メタノール、トリエチルアミン溶液にて粒子を洗浄後、10%無水酢酸/メタノールを添加し、室温で30分間反応させ、未反応のヒドラジド基をキャッピングした。キャッピング後、メタノール、塩酸水溶液、水にて粒子を洗浄した。
2-aminobenzamide(2-AB、和光純薬、574-92441)による標識を行った。粒子の入ったディスポカラムに、2-ABおよびシアノ水素化ホウ素ナトリウムの終濃度がそれぞれ0.7M、1Mになるように30%酢酸/ジメチルスルホシキド(DMSO)混合溶媒に溶解させて調製した溶液100μLを添加し、60℃で2時間反応させた。
反応溶液50μLを回収し、アセトニトリルで10倍に希釈した後、シリカカラム (BlotGlycoキット付属品)に添加してシリカゲルに標識糖鎖を吸着させた。アセトニトリルにてカラムを洗浄後、超純水50μLにて標識糖鎖を回収した。
(標識化糖鎖の検出)
得られた標識糖鎖をHPLCにて測定した。アミノカラム(Shodex Asahipak NH2P-50)を用いて励起波長330nm、蛍光波長420nmにて測定した。
下記、糖鎖の標識工程以外の工程である糖鎖サンプルの調製、糖鎖捕捉担体による糖鎖精製、余剰2ABの除去、標識化糖鎖の検出は実施例1と同様にして行った。
2-aminobenzamide(2-AB、和光純薬、574-92441)による標識を行った。粒子の入ったディスポカラムに、2-ABおよびシアノ水素化ホウ素ナトリウムの終濃度がそれぞれ1.4M、1Mになるように30%酢酸/ジメチルスルホシキド(DMSO)混合溶媒に溶解させて調製した溶液100μLを添加し、60℃で2時間反応させた。
下記、糖鎖の標識以外の工程である糖鎖サンプルの調製、糖鎖捕捉担体による糖鎖精製、余剰2ABの除去、標識化糖鎖の検出は実施例1と同様にして行った。
2-aminobenzamide(2-AB、和光純薬、574-92441)による標識を行った。粒子の入ったディスポカラムに、2-ABおよびシアノ水素化ホウ素ナトリウムの終濃度がそれぞれ2.8M、1Mになるように30%酢酸/ジメチルスルホシキド(DMSO)混合溶媒に溶解させて調製した溶液100μLを添加し、60℃で2時間反応させた。
下記、糖鎖の標識工程以外の工程である糖鎖サンプルの調製、糖鎖捕捉担体による糖鎖精製、余剰2ABの除去、標識化糖鎖の検出は実施例1と同様にして行った。
2-aminobenzamide(2-AB、和光純薬、574-92441)による標識を行った。粒子の入ったディスポカラムに、2-ABおよびシアノ水素化ホウ素ナトリウムの終濃度がそれぞれ1.4M、1Mになるように30%酢酸/ジメチルスルホシキド(DMSO)混合溶媒に溶解させて調製した溶液200μLを添加し、60℃で2時間反応させた。
下記、糖鎖の標識工程以外の工程である糖鎖サンプルの調製、糖鎖捕捉担体による糖鎖精製、余剰2ABの除去、標識化糖鎖の検出は実施例1と同様にして行った。
2-aminobenzamide(2-AB、和光純薬、574-92441)による標識を行った。粒子の入ったディスポカラムに、2-ABおよびシアノ水素化ホウ素ナトリウムの終濃度がそれぞれ0.35M、1Mになるように30%酢酸/ジメチルスルホシキド(DMSO)混合溶媒に溶解させて調製した溶液100μLを添加し、60℃で2時間反応させた。
下記、糖鎖の標識工程以外の工程である糖鎖サンプルの調整、糖鎖捕捉担体による糖鎖精製、余剰2ABの除去、標識化糖鎖の検出は実施例1と同様にして行った。
2-aminobenzamide(2-AB、和光純薬、574-92441)による標識を行った。粒子の入ったディスポカラムに、2-ABおよびシアノ水素化ホウ素ナトリウムの終濃度がそれぞれ1.4M、1Mになるように30%酢酸/ジメチルスルホシキド(DMSO)混合溶媒に溶解させて調製した溶液50μLを添加し、60℃で2時間反応させた。
続いて、実施例2、実施例4及び比較例2で得られたピークの総面積をグラフにしたものを図3に示す。溶液量が50μLよりも多くなるにつれて得られるピーク面積値が大きくなった。
上記の結果から、糖鎖捕捉担体を用いて糖鎖を捕捉、精製した後、糖鎖を遊離させ、遊離した糖鎖を芳香族アミンで構成される高濃度(0.5mol/L以上)の蛍光物質で糖鎖を標識する、本願の糖鎖の蛍光標識方法は、優れた効果を有することが明らかになった。
Claims (11)
- 糖鎖を蛍光標識する方法であって、
濃度が0.5mol/L以上の芳香族アミンで構成される蛍光物質と糖鎖を反応させ標識すること
を特徴とする糖鎖蛍光標識方法。 - 芳香族アミンの芳香環部分が、ベンゼン環、ピレン環、ナフタレン環、アクリドン環、フルオレセイン環、ダンシル環、クマリン環、アクリジン環、またはこれらのいずれかの誘導体である、請求項1に記載の糖鎖蛍光標識方法。
- 芳香族アミンで構成される蛍光物質の励起波長が330~750nmである、請求項1または2に記載の糖鎖蛍光標識方法。
- 芳香族アミンで構成される蛍光物質の発光波長が420~780nmである、請求項1~3のいずれか1項に記載の糖鎖蛍光標識方法。
- 前記芳香族アミンを有する蛍光物質が、2-Aminobenzamide,2-Aminobenzoic acid,8-Aminopyrene-1,3,6-trisulfonate,8-Aminonaphthalene-1,3,6-trisulphonate,2-Amino-9(10H)-acridone,5-Aminofluorescein,Dansylethylenediamine,7-Amino-4-methylcoumarine,3-Aminobenzoic acid,7-Amino-1-naphthol,3-(Acetylamino)-6-aminoacridine、及び前記芳香族アミンを有する蛍光物質のいずれかの誘導体から選ばれる少なくとも一種類の蛍光物質である請求項1~4のいずれか1項に記載の糖鎖蛍光標識方法。
- 糖鎖捕捉担体を用いて糖鎖を捕捉、精製した後、前記糖鎖捕捉担体より糖鎖を遊離させ、遊離した糖鎖を前記芳香族アミンで構成される蛍光物質で糖鎖を標識するものである請求項1~5のいずれか1項に記載の糖鎖の蛍光標識方法。
- 前記糖鎖が、生体由来物質である請求項1~8のいずれか1項に記載の糖鎖蛍光標識方法。
- 前期糖鎖が、糖アミノ酸、糖ペプチド、糖タンパク質、糖脂質、グリコサミノグリカン、プロテオグリカン、グリコシルホスファチジルイノシトール、ペプチドグリカン、およびリポ多糖の中のいずれかに結合した糖鎖、または遊離の糖鎖である請求項1~9のいずれか1項に記載の糖鎖蛍光標識方法。
- 請求項1~10のいずれか1項に記載の糖鎖蛍光標識方法に用いられるキット。
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KR20140040109A (ko) | 2014-04-02 |
JPWO2012124609A1 (ja) | 2014-07-24 |
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