WO2005095962A1 - ポリペプチドを固定化する方法、ポリペプチドが固定化されてなる固体支持体 - Google Patents
ポリペプチドを固定化する方法、ポリペプチドが固定化されてなる固体支持体 Download PDFInfo
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- WO2005095962A1 WO2005095962A1 PCT/JP2005/006151 JP2005006151W WO2005095962A1 WO 2005095962 A1 WO2005095962 A1 WO 2005095962A1 JP 2005006151 W JP2005006151 W JP 2005006151W WO 2005095962 A1 WO2005095962 A1 WO 2005095962A1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K1/00—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length
- C07K1/107—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length by chemical modification of precursor peptides
- C07K1/1072—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length by chemical modification of precursor peptides by covalent attachment of residues or functional groups
- C07K1/1077—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length by chemical modification of precursor peptides by covalent attachment of residues or functional groups by covalent attachment of residues other than amino acids or peptide residues, e.g. sugars, polyols, fatty acids
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- the present invention provides a method for immobilizing a polypeptide, a solid support on which the polypeptide is immobilized, a method for detecting and purifying the polypeptide using the same, and a method for immobilizing the polypeptide.
- a solid support For a solid support.
- DNA chips have been reported to date! These DNA chips were useful for confirming changes in gene expression under certain phenotypes and physiological conditions, and for creating a database of expression patterns. Normally, DNA chips cannot be used to quantify protein expression levels, since gene and protein expression levels and patterns are not always exactly correlated. In addition, since the function of a protein changes after being subjected to various modifications such as phosphorylation, glycosylation, and cleavage after translation, information on the post-translational modification cannot be obtained from DNA analysis. [0005] Therefore, a protein chip was developed using the DNA array technology as a tool for protein analysis.
- the principle of a protein chip is the same as that of a DNA chip, in which proteins are immobilized on a slide glass II membrane at high density, and proteins and nucleic acids that interact with them are detected.
- a protein chip in which proteins are immobilized on a slide glass II membrane at high density, and proteins and nucleic acids that interact with them are detected.
- it has been difficult to immobilize a protein with a very unstable structure, which is made up of cleverly entangled amino acids with a strong DNA strand, on a substrate.
- conventionally developed protein chips include a polymer glass such as a polylysine applied to the surface of a slide glass or a silicon substrate, and then a protein for immobilizing proteins.
- a polymer glass such as a polylysine applied to the surface of a slide glass or a silicon substrate
- a protein for immobilizing proteins In a method of immobilizing a protein by applying a polymer such as the above, the immobilized state of the protein is unstable, causing problems such as peeling off in the washing step, and the immobilized protein is stored for a long time. It was impossible to do that.
- There were also problems such as nonspecific adsorption of biological substances, inactivation of protein functions, and UV opacity of the detection system.
- a solid support for immobilizing a polypeptide containing a protein As a support for immobilizing a polypeptide containing a protein, a solid support comprising a surface treatment layer and a chemically modified layer sequentially provided on the surface of a substrate (eg, For example, Patent Document 1), and a solid support in which a part or the whole of a substrate surface is formed of a carbon layer and a metal chelate is formed on the layer (Patent Document 2) have been developed.
- the immobilization amount of the polypeptide on the solid support and the binding strength of the polypeptide are not necessarily sufficient, and the immobilization amount of the polypeptide is higher and the polypeptide binding strength is higher. The emergence of higher solid supports is desired.
- Patent Document 1 JP-A-2002-365293
- Patent Document 2 Japanese Patent Application Laid-Open No. 2004-020328
- An object of the present invention is to provide a method for firmly and specifically immobilizing a polypeptide, and a solid support for the method.
- the present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, introduced an oligocysteine sequence into a polypeptide using a solid support having a maleimide group introduced via an amino group on a substrate. As a result, it was found that the amount of immobilized polypeptide and the binding strength of the polypeptide were significantly improved, and the present invention was completed.
- the present invention includes the following inventions.
- R is a divalent hydrocarbon group having 1 to 12 chain members
- a method for immobilizing a polypeptide by binding a polypeptide having an oligocysteine sequence introduced thereto to a maleimide group of a solid support having a group represented by the formula:
- R is a divalent hydrocarbon group having 1 to 12 chain members
- a polypeptide in which an oligocystine sequence is introduced is bonded to a maleimide group of a solid support having a group represented by the formula:
- a sample polypeptide is brought into contact with the polypeptide-immobilized solid support according to any of (3) to (5) to detect an interaction between the immobilized polypeptide and the sample polypeptide. how to.
- R is a divalent hydrocarbon group having 1 to 12 chain members
- R is a divalent hydrocarbon group having 1 to 12 chain members
- FIG. 1 shows the results of ESCA analysis of the surface of the solid support of the present invention prepared in Example 1.
- FIG. 2 shows the structures of five types of proteins expressed in Example 2.
- FIG. 3 shows an outline of expression vector construction in Example 2.
- FIG. 4 shows the results of confirming EGFP expression by SDS-PAGE.
- Fig. 5 shows the result of confirmation of fluorescence by a UV irradiation device.
- FIG. 6 shows spotting positions of various polypeptides in Example 3.
- FIG. 7 shows the results of immobilizing various polypeptides on a solid support having a maleimide group by spotting in Example 3.
- FIG. 8 shows the results of Example 4 in which a solid support having a maleimide group was immersed in a solution containing various polypeptides and immobilized.
- FIG. 9 is a diagram showing a pattern of a portion where a DLC layer was formed and an amino group and a maleimide group were introduced on a silicon substrate in Example 5.
- FIG. 10 is a diagram showing the results of measurement of fluorescence in Example 5 in which a solid support was immersed in EGFP solutions of various concentrations to immobilize EGFP, and fluorescence was measured.
- Fig. 11 is a diagram showing the results of the detection of the primary antibody and the secondary antibody reacted with chemiluminescence after immobilization of GFP in Example 5.
- the solid support on which the polypeptide is immobilized has a structure in which a chemically modified group is bonded to the surface of the substrate.
- Examples of the material of the substrate used in the present invention include silicon, glass, fiber, wood, paper, Lamix, plastics (eg polyester resin, polyethylene resin, polypropylene resin, ABS resin (Acrylonitrile Butadiene Styrene resin), nylon, acrylic resin, fluorine resin, polycarbonate resin, polyurethane resin, methylpentene) Butter, phenolic resin, melamine resin, epoxy resin, and salt-and-water resin.
- plastics eg polyester resin, polyethylene resin, polypropylene resin, ABS resin (Acrylonitrile Butadiene Styrene resin), nylon, acrylic resin, fluorine resin, polycarbonate resin, polyurethane resin, methylpentene) Butter, phenolic resin, melamine resin, epoxy resin, and salt-and-water resin.
- plastics eg polyester resin, polyethylene resin, polypropylene resin, ABS resin (Acrylonitrile Butadiene Styrene resin), nylon, acrylic resin, fluorine resin, polycarbonate
- the carbon layer formed on the substrate is not particularly limited, but may be diamond, diamond-like carbon, amorphous carbon, graphite, hafnium carbide, carbon carbide, silicon carbide, tantalum carbide, thorium carbide, Examples of such a layer include titanium carbide, uranium carbide, tundatin carbide, zirconium carbide, molybdenum carbide, chromium carbide, and vanadium carbide, and a diamond-like carbon (DLC) layer is preferred.
- DLC diamond-like carbon
- the carbon layer has excellent chemical stability and can withstand subsequent reactions in chemical modification and binding with the analyte.Because it is bonded to the analyte by electrostatic bonding, the bond is flexible. This is particularly advantageous in that it is transparent to the detection system UV due to lack of UV absorption and that it can be energized during electroblotting. In addition, in the binding reaction with the analyte, there is little non-specific adsorption.
- the formation of the carbon layer can be performed by a known method.
- examples include microwave plasma CVD (Chemical vapor deposit), ECRCVD (Electric cyclotron on resonance chemical vapor deposit), ICP (Inductive coupled plasma), DC sputtering, ECR (Electric cyclotron resonance) sputtering, and ionization evaporation.
- the source gas (methane) is decomposed by a glow discharge generated between the electrodes due to high frequency, and a DLC (diamond-like carbon) layer is synthesized on the substrate.
- the source gas (benzene) is decomposed and ionized using thermoelectrons generated by a tungsten filament, and a carbon layer is formed on a substrate by a bias voltage.
- the DLC layer may be formed by an ionization vapor deposition method.
- a direct current voltage is applied between a solid graphite material (cathode evaporation source) and a vacuum vessel (anode) to cause an arc discharge in a vacuum to generate a cathode force plasma of carbon atoms. Is generated, and by applying a more negative voltage to the substrate than the evaporation source, carbon ions in the plasma are accelerated toward the substrate to form a carbon layer.
- a carbon layer can be formed by irradiating, for example, an Nd: YAG laser (pulse oscillation) light to a graphite target plate and fusing it, and depositing carbon atoms on a glass substrate.
- Nd: YAG laser pulse oscillation
- the thickness of the carbon layer is generally about a monomolecular layer to about 100 m. If the thickness is too small, the surface of the underlying solid support may be locally exposed. It is preferably 2 nm to 1 ⁇ m, more preferably 5 nm to 500 nm, because productivity is deteriorated. Note that all of the solid support may be composed of a carbon material.
- the solid support is a laminate or composite of diamond-like carbon and a substrate material (e.g., diamond-like carbon and another substance, which can be formed only by the structure in which the carbon layer is formed on the substrate as described above).
- a complex e.g, a two-phase body
- a polypeptide By forming a carbon layer such as a diamond-like carbon layer on a substrate, a polypeptide can be immobilized at a high density and a high SZN ratio can be obtained, so that detection with high sensitivity becomes possible. Further, it can be used repeatedly.
- the shape and size of the substrate are not particularly limited, and examples of the shape include a flat plate, a thread, a sphere, a polygon, and a powder.
- the width is usually 0.1. ⁇ 100mm, length 0.1 ⁇ 100mm, thickness 0.01 ⁇ ⁇ : about LOmm.
- the surface is intentionally roughened in Ra FIS B 0601) in the range of lnm to 1000 nm.
- Ra FIS B 0601 Ra FIS B 0601
- Such a roughened surface is advantageous in that the surface area of the substrate increases and a large amount of polypeptide can be immobilized at high density.
- an amino group is introduced into the substrate having the carbon layer.
- the introduction of the amino group can be carried out by irradiating the substrate with ultraviolet rays in chlorine gas to chlorinate the surface and then irradiating the substrate with ultraviolet rays in ammonia gas.
- the method can be performed by subjecting a substrate provided with a diamond-like carbon layer to a plasma method in an ammonia atmosphere.
- the plasma method is a method in which plasma is generated in a discharge of direct current or alternating current under vacuum conditions, and benzene or methane is used as a source gas, for example, and a biased substrate is treated with a gas subjected to ionization.
- R is a divalent hydrocarbon group having 1 to 12 chain members.
- the divalent hydrocarbon group having 1 to 12 chain members alkylene groups having 1 to 12 chain members, preferably 4 to 6 chain members, such as tetramethylene group, pentamethylene group, hexamethylene group, and 1 to 12 chain members
- a divalent alicyclic hydrocarbon group such as a cyclohexylene group or an arylene group such as 2,2'-biphenylene
- a divalent aromatic ring-containing hydrocarbon group such as an o-xylylene group.
- These divalent hydrocarbon groups include, for example, a C alkyl group, an aryl group, a trimethylsilyl group.
- the C alkyl group includes, for example, a methyl group, an ethyl group, a propyl group,
- aryl groups include aromatic hydrocarbon groups such as phenyl, 1-naphthyl and 2-naphthyl, furyl, phenyl, phenyl, pyrrolyl, oxazolyl, isoxazolyl, thiazolyl, and isothiazolyl.
- aromatic complex ring groups such as imidazolyl group, pyrazolyl group, pyridyl group, pyrimidyl group, pyridazyl group, pyrazur group, quinolyl group and isoquinolyl group.
- the acryl group include C aliphatic acryl groups such as formyl group, acetyl group, propanol group, butanol group, pentanoyl group, and hexanoyl group.
- R examples include — (CH 2) —, — (CH 2) —, — (CH 2) —, —CH (C
- the salt of the compound represented by the formula II is not particularly limited, and for example, a sodium salt, a potassium salt and the like can be used. It is preferable to use sodium salt.
- the reaction is carried out by immersing the solid support having the amino group introduced therein in a solution containing the compound of the formula II at a concentration of usually 0.1 to L00 mM in a buffer.
- a buffer PBS (phosphate buffered saline), triethanolamine buffer, sodium borate buffer and the like can be used.
- PBS phosphate buffered saline
- triethanolamine buffer sodium borate buffer and the like
- the reaction temperature is usually 10 to 80 ° C, preferably 25 to 30 ° C, and the reaction time is usually 1 to 300 minutes. , Preferably 30 to 60 minutes.
- the chemical modifying group having a maleimide group is firmly bonded to the carbon in the carbon layer by a covalent bond, so that it is not peeled off by washing or temperature change. It is also possible to store the solid support for a long time.
- the polypeptide includes peptide fragments, oligopeptides and proteins. It may be a simple protein, a complex protein or a natural or synthetic protein.
- the number of amino acids of the polypeptide immobilized on the solid support of the present invention is not particularly limited. The strength is usually 10 to 3,000, preferably ⁇ 50 to 2,000, and more preferably ⁇ 100 to 1500.
- the polypeptide that can be immobilized on the solid support of the present invention is not particularly limited. For example, antibodies, enzymes, pathogenic proteins, peptide hormones, receptors, kinases, glycoproteins, metalloproteins, viral proteins, and inducible proteins Etc. can be suitably immobilized.
- the polypeptide also includes a peptide derivative.
- Peptide derivatives include peptides in which one or several amino acids have been induced by a chemical reaction.
- Examples of peptide derivatives include molecules from which reactive amino acid side groups, such as free amino groups, free carboxyl groups, or free hydroxyl groups have been derived.
- Specific examples of derivatives of amino groups are sulphonic or carboxylic amides, thiourethane derivatives and ammonium salts, for example the hydrochloride.
- carboxyl group derivatives are salts, esters and amides.
- Examples of hydroxyl group derivatives are o-acyl or o-alkyl derivatives.
- peptides in which one or several amino acids are naturally occurring or have been replaced by amino acid homologues of the twenty "standard" amino acids that are non-naturally occurring.
- amino acid homologues examples include 4-hydroxyproline, 5-hydroxylysine, 3-methylhistidine, homoserine, ortin, ⁇ -alanine and 4-aminobutyric acid.
- a covalent bond is formed by introducing an oligocysteine sequence into a polypeptide and reacting a maleimide group present on the surface of the solid support of the present invention with an SH group of a cysteine residue.
- the maleimide group has high selectivity for SH groups, and thus can specifically bind a polypeptide having an origocystin sequence introduced thereto to a solid support. It comes out.
- the oligocysteine sequence generally means a sequence in which at least 3, preferably 3 to: LO, more preferably 4 to 6 cysteine residues are continuous.
- the oligocystin sequence may be referred to as a cysteine tag.
- a label for purification in addition to the oligocysteine sequence for immobilization in the target polypeptide.
- labels include oligo-histidine sequences that specifically interact with metal ions such as zinc, nickel or cobalt ions (referred to as histidine tags, including, for example, hex-histidine sequences), or zinc, respectively.
- histidine tags including, for example, hex-histidine sequences
- a polylysine sequence containing at least about 4 lysines or a polyarginine sequence containing at least 4 arginine residues, which specifically interacts with copper may be mentioned.
- the target polypeptide can be easily isolated using a reagent or column that specifically interacts with the label.
- a nickel column can be used for oligohistidine sequences.
- Introduction of an oligocysteine sequence and an oligohistidine sequence into a polypeptide can be carried out by a method combining PCR generally used in the art and gene closing using Escherichia coli.
- a plasmid vector having a region encoding an oligocystine sequence and an oligohistidine sequence is constructed, and the target polypeptide is introduced later using a restriction enzyme site or the like.
- a polypeptide in which the oligocysteine and oligohistidine sequences are linked can be produced.
- nucleotide sequence encoding a target polypeptide when amplified by PCR or the like, a nucleotide sequence encoding an oligocysteine sequence and an oligohistidine sequence is contained in each DNA primer, and this is used to prepare a target polypeptide. After amplifying the nucleotide sequence of the peptide, this DNA fragment can be introduced into a vector and expressed to produce a fusion polypeptide linked to both sequences.
- the oligocysteine sequence is preferably introduced at the N-terminus or C-terminus of the target polypeptide.
- the site of introduction is not limited to the terminal unless it hinders the fixation. Since the SH group reacts with the maleimide group to form a covalent bond, the target polypeptide binds tightly to the chemical modifying group of the present invention.
- the oligohistidine sequence is generally introduced in a form that is not linked to the N-terminal or C-terminal of the target polypeptide or the oligocysteine sequence without having the oligocysteine sequence of the target polypeptide.
- the introduction site is not limited to the end unless otherwise defined.Oligohistidine and a target polypeptide having an oligocysteine sequence are expressed in a host cell, extracted, and then a nickel column is used using the oligohistidine sequence. Purification is performed by an ordinary method such as
- polypeptide into which the oligocystin sequence is introduced is dissolved in a spotting buffer, and spotted on the solid support of the present invention, whereby the polypeptide can be immobilized.
- the polypeptide into which the oligocystin sequence is introduced is dissolved in a spotting buffer so that the concentration is usually 0.01 to: LOO / zM, preferably 5 to 50 ⁇ l, to prepare a spotting solution.
- a spotting buffer include a 1-100%, preferably 20-50% PEG (polyethylene glycol) solution, PBS (phosphate buffered saline), 50% DMSO (dimethyl sulfoxide), and 3 ⁇ SSC (saline sodium citrate) and pure water can be used.
- PEG polyethylene glycol
- PBS phosphate buffered saline
- 50% DMSO dimethyl sulfoxide
- 3 ⁇ SSC saline sodium citrate
- the maleimide group has the best reaction efficiency at around pH 7 as soon as it is hydrolyzed.
- the prepared spotting solution can be dispensed into a 96-well or 384-well plastic plate, and the dispensed solution can be spotted on a solid support using a spotter or the like.
- a spotter or the like By arranging various kinds of polypeptides in an array as spots independent of each other, the interaction of the plural kinds of polypeptides can be detected.
- Incubation is usually performed at a temperature of 4 to 30 ° C., preferably 25 to 30 ° C., for usually 0.5 to 16 hours, preferably 1 to 2 hours. Incubation is preferably performed in a high humidity atmosphere, for example, at a humidity of 50 to 90%. Following the incubation, washing is preferably performed using a washing solution (eg, 50 mM TBS / 0.05% Tween20) to remove polypeptides not bound to the solid support.
- a washing solution eg, 50 mM TBS / 0.05% Tween20
- the present invention also relates to a method for detecting an interaction between polypeptides by reacting a polypeptide immobilized on a solid support as described above with a sample polypeptide interacting with the polypeptide.
- the interaction between polypeptides include an antigen-antibody reaction, an enzyme reaction, a reaction between a receptor and a ligand, and a biotin-streptavidin interaction.
- the sample polypeptide was labeled and immobilized on a solid support. By contacting with the polypeptide and reading out the label derived from the sample polypeptide interacting with the polypeptide, the presence or absence of the interaction can be detected. Labeling of the sample polypeptide can be performed by a method commonly used in the art.
- the label is not particularly limited as long as it can be incorporated into the polypeptide.
- 1S fluorescent labels (CyDye such as Cy3 and Cy5, FITC, RITC, rhodamine, texathread, TET, TAMRA, FAM , HEX, ROX, GFP, etc.), radioactive labeling ( ⁇ -32P, ⁇ -32P, 35S, etc.), enzyme labeling (HRP (Horseradish peroxidase), ALPHA lipophosphatase, etc.).
- HRP Hydrophilidish peroxidase
- ALPHA lipophosphatase etc.
- chemiluminescent reagent luminol, luciferin, umbelliferone, coelenterazine, dioxetane compound, D-luciferin potassium, bis-oxalate (2,4,6 )can be detected.
- the sample of the sample polypeptide is prepared by dissolving in a buffer so that the concentration is usually 0.01 to: LOO / zM, preferably 1 to 10M.
- the obtained sample solution is dropped on a solid support on which the polypeptide prepared above is immobilized, and the mixture is incubated. The interaction is performed by performing the chilling.
- Incubation is usually performed at 4 to 30 ° C, preferably 25 to 30 ° C, usually for 0.5 to 16 hours, preferably for 1 to 4 hours.
- the incubation is preferably performed in a high humidity atmosphere.
- the solid support is washed and dried, and the detection is performed by reading the label.
- the amino acid sequence of the polypeptide that specifically interacted with the polypeptide on the solid support can be analyzed.
- mass spectrometry can be performed by ionizing only the polypeptide that has interacted with the polypeptide immobilized on the solid support.
- the substance immobilized on the solid support can be directly subjected to mass spectrometry by a means such as laser desorption Z ionization-time-of-flight mass spectrometry.
- mass spectrometry by a means such as laser desorption Z ionization-time-of-flight mass spectrometry.
- the types of ionization methods that can be used for mass spectrometry include matrix-assisted laser desorption (MALDI), ionization by electron impact (EI), photoionization, and LET emitted from radioisotopes.
- Ionization using ⁇ or j8 rays secondary ionization, fast atom bombardment ionization, field ionization, surface ionization, chemical ionization (CI), field ionization (FI), spark discharge A matrix-assisted laser desorption (MALDI) method and an ion bombardment (EI) method using electron impact are preferred.
- the present invention also provides a method of introducing an oligocysteine sequence into a polypeptide of interest, bringing the oligocysteine sequence into contact with the solid support of the present invention, and binding the same to the solid support by a covalent bond with a maleimide group.
- a method for purifying the polypeptide Since the solid support having a maleimide group of the present invention specifically binds to the SH group, it can be separated and purified by binding only the polypeptide into which the oligocystin sequence is introduced.
- a protein expression vector that expresses an oligocysteine sequence fused to a protein is constructed, and a maleimide group that specifically covalently binds under mild conditions is introduced into the SH group of the cysteine.
- the protein can be recovered using the solid support thus prepared.
- the use of a protein tag consisting of an oligocystin sequence and the use of covalent binding as a recovery system can be achieved by using a conventional histidine tag using metal chelate, a GST tag using affinity between enzyme and substrate, and a specific antibody. Epi such as FLAG tag used It is a completely new and completely different idea from topp tags.
- the conventional protein tag focuses on purifying the tagged protein itself, whereas the cysteine tag (oligocysteine sequence) of the present invention is obtained by recovering with a strong covalent bond.
- the cysteine tag oligocysteine sequence
- covalent recovery facilitates the purification and purification of the cysteine-tag fusion protein itself, and is also excellent for analyzing post-translational modifications of proteins by directly subjecting the protease to mass spectrometry after cleavage on a solid support.
- a DLC layer having a thickness of ⁇ m was formed on a silicon substrate cut into a 3 mm square by using the gas obtained by mixing 95% by volume of methane gas and 5% by volume of hydrogen at an accelerating voltage of 0.5 kV by ion ion deposition. After that, amination was performed for 10 minutes by a plasma method in an ammonia gas atmosphere.
- reaction solution having the following composition was prepared, and the aminated solid support was immersed in the reaction solution for 30 minutes. Thereafter, the substrate was washed three times with pure water and vacuum dried at 100 ° C for 30 minutes.
- sulfo EMCS Dojini Danigaku Kenkyusho Co., Ltd.
- CH 2 a sodium salt having a length of one
- FIG. 2 shows the structures of the proteins represented in Samples 1 to 5.
- the site is cross-linked with Ndel and Xhol, and the reading frame is inserted downstream of 6XHis and 5XCys, and the 6XHis-GFP and 5XCysGFP ( Figure 3, Step 3) proteins are inserted.
- An expression vector was constructed.
- a single colony was placed on a toothpick from an agar medium (LB, Ampicillin 50 ⁇ g / ml, Chloramphenicol 50 ⁇ g / ml) in which the BL21 strain (manufactured by Novagen) transformed with an expression vector into which DNA encoding each protein had been introduced was cultured. And suspended in 30 ml of LB medium (Ampicillin 50 ⁇ g / ml). IPTG was added to a final concentration of 0.4 mM and cultured at 23 ° C and 160 rpm for 24 hours.
- LB agar medium
- Ampicillin 50 ⁇ g / ml Ampicillin 50 ⁇ g / ml
- Chloramphenicol 50 ⁇ g / ml Chloramphenicol 50 ⁇ g / ml
- IPTG was added to a final concentration of 0.4 mM and cultured at 23 ° C and 160 rpm for 24 hours.
- Each culture was centrifuged and collected (10OOg, 10min, 4 ° C).
- the LB medium was discarded, the cells were resuspended in PBS (pH 7.4), E. coli was washed with Vortex, and collected again. Thereafter, the dry weight of E. coli was measured.
- the protein extraction reagent Bugbuster (Novagen) was added to 5 ml Zg, Benzonase (Novagen) to 25 U / ml, and Lysozyme (Novagen) to 5 KU / ml, and shaken at room temperature for 20 minutes. After centrifugation (lOOOOg, lOmin, 4 ° C), the supernatant was recovered and filtered through a 0.2 / zm filter.
- Samples 1, 2, 4, and 5 were tagged with a His tag and purified using a His-Trap column (Amersham). Thereafter, the solution was desalted with Microcon YM-10 (manufactured by Millipore) and concentrated. For sample 3, column purification was not possible, so only desalting and concentration were performed.
- Example 2 Mix the various types of tagged EGFP recovered in Example 2 with 100% PEG 1: 1 A 10 1 solution was prepared. Each spotting solution was spotted on the solid support produced in Example 1 in a 0.51 position using a micropilotter in the arrangement shown in FIG. Incubated for 1 hour at room temperature in a moist box. After washing with 50 mM TBS / 0.05% Tween20 (25 ° C, 5 min), the plate was washed with PBS (pH 7.4) (25 ° C, 5 min). The sample was washed with pure water, carefully covered with a cover glass so as not to dry, and measured with LAS-1000 (manufactured by Fuji Photo Film Co., Ltd.) (exposure 30 seconds). Fig. 7 shows the results.
- Example 2 and 2 ⁇ PBS were mixed 1: 1 in a PCR tube to prepare a soaking solution 501.
- the solid support prepared in Example 1 was immersed in a tube and incubated at room temperature for 18 hours. After washing with PBS for 30 minutes, the sample was washed with pure water, covered with a cover glass so as not to dry, and measured with LAS-1000 (Fuji Photo Film Co., Ltd.) (exposure: 30 seconds).
- Fig. 8 shows the results.
- EGFP Enhanced Green Fluorescence Protein
- DLC diamond-like carbon
- a resist was applied on a silicon substrate by a spin coater. Next, a mask having a pattern as shown in FIG. Then, a DLC layer was formed and amino groups were introduced in the same manner as in Example 1.
- the obtained substrate was immersed in ImM Sulfo EMCS reagent in lX PBS (pH 7.4) at room temperature for 1 hour, washed with PBS (10 minutes) and ultrapure water (10 minutes X 2), and dried.
- ImM Sulfo EMCS reagent in lX PBS (pH 7.4) at room temperature for 1 hour, washed with PBS (10 minutes) and ultrapure water (10 minutes X 2), and dried.
- the resist was stripped using ethanol, and the ethanol was washed. ⁇ After the blow, the substrate was vacuum-dried at 100 ° C for 1 hour.
- the plate was washed 3 times with 50 mM TBS / 0.05% Tween 20 for 5 minutes. After washing with ultrapure water for 5 minutes, fluorescence was measured using LAS-1000 (Fuji Photo Film Co., Ltd.) (Fig. 10). Blocking was performed for 1 hour at room temperature using Blocking Reagent (Roche). The obtained solid support was reacted with a primary antibody (monoclonal anti-green fluorescent protein (SIGMA)) diluted to 1Z10000 (room temperature, 1 hour). The plate was washed with PBS for 10 minutes, followed by V for 20 minutes.
- SIGMA monoclonal anti-green fluorescent protein
- HRP-labeled anti-mouse IgG antibody SIGMA
- HRP-labeled secondary antibody HRP-labeled anti-mouse IgG antibody (SIGMA)
- SIGMA HRP-labeled anti-mouse IgG antibody
- Chemiluminescence was performed using Super Signal ELISA Femto Maximum Sensitivity Substrate (Pierce) as a chemiluminescence reagent, and chemiluminescence was measured with LAS-1000 (Fuji Photo Film Co., Ltd.) (FIG. 11).
- the solid support can be immobilized on the polypeptide solid support. It became clear that detection was possible with sensitivity.
- a polypeptide can be firmly and specifically immobilized on a solid support. Therefore, the use of the solid support of the present invention enables production of a protein chip having a high detection limit. Using such a protein chip, a polypeptide that interacts with the immobilized polypeptide can be detected with high sensitivity.
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Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2004102739 | 2004-03-31 | ||
JP2004-102739 | 2004-03-31 | ||
JP2004-204769 | 2004-07-12 | ||
JP2004204769A JP2005312425A (ja) | 2004-03-31 | 2004-07-12 | ポリペプチドを固定化する方法、ポリペプチドが固定化されてなる固体支持体、これを用いたポリペプチドの検出方法及び精製方法、ならびにポリペプチドを固定化するための固体支持体 |
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WO2005095962A1 true WO2005095962A1 (ja) | 2005-10-13 |
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JP2007282591A (ja) * | 2006-04-19 | 2007-11-01 | Yamaguchi Univ | スタスミンチップ及びこれを用いたスタスミン結合タンパク質の検出方法 |
JP2008105973A (ja) * | 2006-10-24 | 2008-05-08 | Toyo Kohan Co Ltd | ポリペプチド固定化担体の保存方法 |
JP5493130B2 (ja) * | 2010-08-25 | 2014-05-14 | 国立大学法人山口大学 | 自己抗体の検出方法 |
JP6136452B2 (ja) * | 2013-03-28 | 2017-05-31 | 東ソー株式会社 | タンパク質を担体に固定化させるためのオリゴペプチド |
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JPH06331627A (ja) * | 1993-05-25 | 1994-12-02 | Ibiden Co Ltd | Fab’フラグメントを固定化した光ファイバー及びその製造方法 |
JP2002365293A (ja) * | 2001-06-08 | 2002-12-18 | Toyo Kohan Co Ltd | 表面処理層が形成された固体支持体 |
JP2004020328A (ja) * | 2002-06-14 | 2004-01-22 | Toyo Kohan Co Ltd | 化学修飾を施した固体支持体およびその用途 |
JP2004506201A (ja) * | 2000-08-03 | 2004-02-26 | マサチューセッツ・インスティチュート・オブ・テクノロジー | 機能性生体分子のマイクロアレイおよびその使用 |
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US6406921B1 (en) * | 1998-07-14 | 2002-06-18 | Zyomyx, Incorporated | Protein arrays for high-throughput screening |
JP2002286715A (ja) * | 2001-03-27 | 2002-10-03 | Canon Inc | ペプチドアレイを用いた特定のペプチドと相互作用可能な蛋白質、脂質または核酸のノンラベル検出法 |
JP2003172737A (ja) * | 2001-12-07 | 2003-06-20 | Toyo Kohan Co Ltd | 固体支持体、基体、バイオセンサ、およびそれらを用いた生体物質の解析方法 |
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JPH06331627A (ja) * | 1993-05-25 | 1994-12-02 | Ibiden Co Ltd | Fab’フラグメントを固定化した光ファイバー及びその製造方法 |
JP2004506201A (ja) * | 2000-08-03 | 2004-02-26 | マサチューセッツ・インスティチュート・オブ・テクノロジー | 機能性生体分子のマイクロアレイおよびその使用 |
JP2002365293A (ja) * | 2001-06-08 | 2002-12-18 | Toyo Kohan Co Ltd | 表面処理層が形成された固体支持体 |
JP2004020328A (ja) * | 2002-06-14 | 2004-01-22 | Toyo Kohan Co Ltd | 化学修飾を施した固体支持体およびその用途 |
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