WO2004099418A1 - 融合蛋白質 - Google Patents
融合蛋白質 Download PDFInfo
- Publication number
- WO2004099418A1 WO2004099418A1 PCT/JP2004/006393 JP2004006393W WO2004099418A1 WO 2004099418 A1 WO2004099418 A1 WO 2004099418A1 JP 2004006393 W JP2004006393 W JP 2004006393W WO 2004099418 A1 WO2004099418 A1 WO 2004099418A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fusion protein
- protein
- antibody
- dna
- sobrinus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies
- C07K16/12—Immunoglobulins [IG], e.g. monoclonal or polyclonal antibodies against material from bacteria
- C07K16/1267—Gram-positive bacteria
- C07K16/1275—Streptococcus (G)
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
- A61P1/02—Stomatological preparations, e.g. drugs for caries, aphtae, periodontitis
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/195—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria
- C07K14/315—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from bacteria from Streptococcus (G), e.g. Enterococci
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K39/00—Medicinal preparations containing antigens or antibodies
- A61K2039/505—Medicinal preparations containing antigens or antibodies comprising antibodies
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
- C07K2319/40—Fusion polypeptide containing a tag for immunodetection, or an epitope for immunisation
Definitions
- the present invention relates to a fusion protein, particularly to a fusion protein that induces an antibody against cariogenic bacteria.
- Non-Patent Document 1 discloses a technique for creating a fusion protein by connecting sites. Antibodies prepared using the fusion protein as an antigen have been confirmed to strongly inhibit the adhesion of S. mutans to saliva-coated hydroxyapatite.
- Non-patent document 2 discloses a technique for producing a large amount of a monoclonal antibody against an adhesin (PAc) on the surface of S. mutans using a recombinant plant.
- PAc adhesin
- the pathogens of dental caries are not limited to S. mutans, but it is thought that dental caries is induced by multiple kinds of bacteria present in the oral cavity. In particular, human carious lesions are frequently separated from S. mutans and further from Storeptococcus sobrinus.
- the object of the present invention has been made in view of the above-mentioned problems, and is effective in inducing an antibody against S. sobrinus, which is one of the main pathogens forming carious lesions.
- An object of the present invention is to provide a fusion protein capable of preventing caries.
- Non-Patent Document l HAO YU, 4 others, ⁇ Effects of Antibodies against Cell Surface ProteinAntigen P Ac-- Glucosyltransf erase Fusion Protein on LJ lucan Synthesis and Ceil Adhesion of Streptococcus mutans, INF ECTION AND IMMUNITY, America, American Society for Microbi ology, June 1997, Vol. 65, No. 6, p. 2292-2298
- Non-Patent Document 2 Ma, ft! L2, "Immunotherapeu1: ic potential of antibodies produced in plants", TIBTECH, 1995, Vol. 13, p. 522-527
- the fusion protein that is useful in the present invention is a macromolecular bacterial surface protein of Streptococcus sobrinus (hereinafter, also referred to as “S. sobrinus”).
- the alanine repeat region is characterized by comprising the following protein (a) or (b).
- the gnorecan binding region force S is characterized by comprising the following protein (a) or (b).
- the alanine repeat region (hereinafter, also referred to as "A_repeat region”) of the high-molecular-weight cell surface protein of S. sobrinus (hereinafter, also referred to as "PAg”) may be referred to.
- This region constitutes a functional region of PAg, that is, a salivary binding region that binds to a salivary glycoprotein of an oral pellicle, and contains a high concentration of alanine localized near the N-terminus.
- S. sobrinus is involved in the initial settlement on the tooth surface.
- S. sobrinus glucan synthase (hereinafter sometimes referred to as "GTF") is a method of synthesizing water-insoluble glucan from sucrose to obtain a hydroxy-treated glucan synthase from S. sobrinus saliva.
- the glucose binding region (hereinafter, also referred to as “glucan_binding region”) is a functional region of the enzyme that binds to glucose, which makes the adhesion to the apatite particles stronger.
- the present inventors have found that the mechanism of action of an antibody against S. sobrinus induced in the oral cavity in suppressing dental caries, that is, inhibition of adhesion of bacterial cells to the tooth surface, whitening of bacterial cells bound with the antibody, Among the mechanisms of phagocytosis by blood cells and inhibition of bacterial cell metabolism, we focused on the mechanism of inhibition of bacterial adhesion to tooth surfaces. Then, a fusion protein, which is a functional region of two proteins that play an important role in the adhesion of the protein and enhances the mechanism of action, and which binds the two specific regions, is used as an antigen. And As a result, as described later, it was confirmed that the antibody obtained after administration of the fusion protein according to the present invention inhibited the attachment of S. sobrinus to the tooth surface at a high rate.
- the present invention relates to the binding order of the alanine repeat region and the glucose binding region, that is, which region is arranged upstream when the amino acid sequence is taken into consideration, or the other peptide that connects the two regions. Import, addition of peptides before and after the above two regions, and the like are not particularly limited.
- the glucan synthase of S. sobrinus may be incorporated into the fusion protein, including one or more amino acids before and after the glucan binding region.
- the fusion protein of the present invention includes deletions, substitutions, or additions of one or more amino acids in the two regions. This is, for example, a method for replacing or deleting a specific amino acid by a point mutation performed on a recombinant DNA described later. Chillon method
- a known method such as the Kunkel method can be used.
- the C-terminal is esterified or amidated, and ⁇ H, C 0 ⁇ H,
- Some modifications such as protecting NH, SH, etc. with a suitable protecting group such as formyl group
- the fusion protein of the present invention thus prepared can be used, for example, as a pharmaceutical composition containing the fusion protein of the present invention as an active ingredient. That is, by directly administering an effective amount of the fusion protein of the present invention capable of inducing immunity to mammals including humans, it is possible to induce an immune response in humans and the like and to carry out long-term caries prevention. Alternatively, as described below, caries can be prevented by recovering an antibody from a mammal to which the fusion protein of the present invention has been administered and administering the antibody into the oral cavity.
- the fusion protein may be used as it is, but usually, a medicine containing the fusion protein as an active ingredient using a pharmaceutically acceptable additive or excipient for a pharmaceutical preparation. It is preferable to produce and use it as a drug composition.
- the administration route of the pharmaceutical composition include local administration capable of inducing an immune response, such as nasal mucosal administration. Therefore, the fusion protein of the present invention is used as an active ingredient of a pharmaceutical composition for local administration such as nasal immunity.
- the recombinant DNA according to the present invention encodes the fusion protein according to the present invention.
- the recombinant DNA according to the present invention has the following nucleotide sequence (a) or (b) encoding the alanine repeat region of the surface protein of the high molecular weight bacterial cell of Streptococci! S sobrinus constituting the fusion protein.
- the fusion protein is characterized by having the following nucleotide sequence (a) or (b) encoding a glucan binding region of a glucan synthase of Streptococcus sobrinus constituting the fusion protein. (a) The base sequence shown in SEQ ID NO: 4 in the sequence listing.
- an expression vector containing the recombinant DNA according to the present invention and a transformant carrying the expression vector are provided.
- examples of the DNA that can hybridize under stringent conditions with the nucleotide sequence represented by SEQ ID NO: 3 or SEQ ID NO: 4 include, for example, the nucleotide sequence represented by SEQ ID NO: 3 or SEQ ID NO: 4.
- DNA containing a base sequence having a homology of about 80% or more, preferably 90% or more is used.
- Hybridization can be performed, for example, according to a method described in a manual of a DIG nucleic acid detection system (Roche).
- stringent hybridization conditions to tolerate about 20% mismatch include 50% formamide (deionized), 5 ⁇ SSC (sodium concentration 0%).
- the recombinant DNA of the present invention can be isolated from genomic DNA derived from S. sobrinus, genomic DNA library, and cDNA derived from S. sobrinus by a known method.
- the combined DNA, synthetic DNA, or deviation may be used.
- a DNA ligase or the like the combined DNA, synthetic DNA, or deviation may be used.
- a known method such as the Kunkel method is used.
- the conversion of the base sequence can be carried out according to the method of or a method analogous thereto.
- the fusion protein can be easily and massively purified by using the above transformant
- the fusion protein is not limited to one prepared by introducing the above recombinant DNA into the transformant. Needless to say.
- a known method of protein synthesis for example, condensing amino acids having a suitably protected amino group and side chain functional group on a resin for protein synthesis in accordance with the above-mentioned amino acid sequence, and after completion of the condensation reaction, various protections By removing the groups and further performing the intramolecular disulfide bond formation reaction in a highly diluted solution, the present invention It is also possible to synthesize a fusion protein.
- the expression vector of the present invention may be any of a plasmid derived from Escherichia coli, a plasmid derived from Bacillus subtilis, a Bataterio phage such as ⁇ phage, and an animal virus such as retrovirus / less and baculoinoleth. ,.
- An expression vector containing a promoter, an enhancer, a splicing signal, a polymerase addition signal, a selection marker and the like depending on the host cell can be used.
- the host cell used in the transformant of the present invention may be, for example, any of bacteria such as Escherichia coli, yeast, insect cells, insects, and animal cells.
- the antibody preparation of the present invention includes an antibody against the above-mentioned fusion protein. That is, the antibody against the fusion protein according to the present invention has an inhibitory action on the attachment of S. sobrinus to the tooth surface, and the action is based on the antibody containing the antibody produced by other mammals including humans. It is also effective when it is administered into the oral cavity as a preparation.
- the antibody contained in the antibody preparation of the present invention can be produced according to a known antibody or antiserum production method.
- the fusion protein is administered to a mammal together with the carrier itself or a carrier and a diluent, and the antibody-containing substance is collected from the immunized mammal and the antibody is separated and purified.
- the mammal to be immunized include a mouse, a rat, a heron, a sheep, a goat, and a chick.
- a human artificial chromosome is immunized by administering the fusion protein to a human polyclonal antibody-producing HAC protein or the like, which is prepared through a known method such as cell fusion or nuclear transfer, to thereby produce a human antibody. It may be good.
- an antibody involved in inhibiting adhesion to the tooth surface as a polyclonal antibody that is simultaneously prepared.
- antibody-producing cells are recovered from an immunized animal, and the monoclonal antibody is purified by a known method. May be produced.
- Examples of the form of the antibody preparation according to the present invention include an oral ointment, a jelly preparation, a mouthwash, and a spray.
- FIG. 1 (a) is a diagram illustrating the PAgA gene region, (b) is a diagram illustrating the configuration of pQE80L-pagA, and (c) is a diagram illustrating the gtfl-GB gene region.
- FIG. 2D is a diagram illustrating the configuration of one GB of pQE80L-pagA-gt fl.
- FIG. 2 is an SDS-PAGE image of Escherichia coli expressing the fusion protein.
- FIG. 3 is an SDS-PAGE image of the purified fusion protein.
- FIG. 4 is a graph showing the relationship between the number of bacteria adhering to hydroxyapatite and the amount of IgG antibody added.
- PAgA DNA fragment encoding the A-repeat region of PAg
- This fragment was obtained by performing a PCR reaction on chromosomal DNA isolated from S. sobrinus strain OMZ176 using the following forward primer 1 and reverse primer 1.
- Reverse primer 1 ATATGAGCTCCTTCTTGTACTGAGCAAGC (including the base sequence described in SEQ ID NO: 6 in the sequence listing, including the Sacl site)
- the PCR reaction was performed for 30 cycles at 98 ° C for 10 seconds, 60 ° C for 30 seconds, and 72 ° C for 1.0 minute.
- the gene region encoding the glucan-binding region of the water-insoluble glucan synthase GTF-I is S. sobrinus.
- GTF-I water-insoluble glucan synthase GTF-I
- gtfl-GB a type of GTF derived from S. sobrinus
- Forward primer 2 ATATGAGCTCCTATACTACTTCGGTAAAGAC (including the base ligation and Sacl site described in SEQ ID NO: 7 in the sequence listing)
- Reverse primer 2 TTTTAAGCTTAGTTCCAGCCACGGTAGAT (base sequence described in SEQ ID NO: 8 in Sequence Listing, including Hindm site)
- the PCR reaction was performed for 30 cycles at 98 ° C for 10 seconds, 65 ° C for 30 seconds, and 72 ° C for 2.0 minutes.
- the DNA fragment obtained by the above (1) and (2) was incorporated into a plasmid expression vector PQE80L (manufactured by Qiagen) encoding six consecutive His residues as follows.
- DNA fragment obtained in the above (1) and pQE80L are cleaved by restriction enzymes BamHI and Sacl, respectively, and subjected to electrophoresis in each reaction solution after cleavage. Cut out the band used for integration and dissolve each DNA fragment from the gel.
- the purified DNA fragment (1) and the purified vector were ligated using DNA ligase (Takara Shuzo Co., Ltd.).
- DNA ligase Takara Shuzo Co., Ltd.
- FIG. 1 (b) the vector PQE80L-pagA into which the pagA gene region was inserted was created.
- the DNA fragment obtained in the above (2) and the vector pQE80L_pagA were subjected to a cleavage reaction using the restriction enzymes Sacl and Hindlll. About the reaction solution after cutting Also, electrophoresis was performed as described above, and the corresponding band was cut out and eluted and purified.
- the purified DNA fragment (2) and the purified pQE80L_pagA were ligated using a DNA license (Takara Shuzo Co., Ltd.).
- a vector pQE80L_pagA—gtfl—GB into which a gtfl—GB gene region was further inserted was created.
- the transformant obtained in the above [Example 1] was mixed with competent Escherichia coli DH5_ and transformed.
- the obtained transformant was cultured for 1 ⁇ in a 2 X YT medium supplemented with ampicillin so that the concentration of ampicillin became 100 zg / ml, and this culture solution was newly prepared in a 2 X YT medium (ampicillin). (100 ⁇ g / ml) at a ratio of 1:20 and cultured at 37 ° C. for 1 hour.
- IPTG isopropylthiogalactoside
- the culture solution was precipitated at 3500 X g for 20 minutes by centrifugation to collect bacteria, and then washed three times with PBS (phosphate-buffered saline).
- PBS phosphate-buffered saline
- the cells obtained as in (1) were lysed by adding 2X SDS-PAGE sample buffer, heated at 100 ° C for 5 minutes, and electrophoresed on a 10% polyacrylamide gel. . After electrophoresis at 100 V (constant voltage) for 1 hour, an image of the gel stained with protein using Coomassie brilliant blue is shown in FIG.
- lane M is a marker lane
- lane 1 is a lane in which a lysis reaction solution of cells cultured by heating IPTG as described above is migrated
- lane 2 is a lane in which IPTG is dissolved.
- This is a lane in which a lysis reaction solution of bacterial cells cultured without addition, that is, without inducing expression, was electrophoresed.
- the cells are dissolved in cells (100 mM NaHPO, 10 mM Tris-Cl, 8 mM
- Mure a pH 8
- 2X SDS-PAGE sample buffer was added to the mixture to dissolve it, heated at 100 ° C for 5 minutes, and the lysate was mixed with the column bed, introduced into the column, and purified. went.
- Buffer (1 OOmMNaHPO, 10 mM Tris-Cl, 8Murea, pH 6.3) is passed through the column after the adsorption reaction to remove unadsorbed substances.
- the eluted protein fraction was subjected to electrophoresis on a 10% polyacrylamide gel in the same manner as described above. After electrophoresis at 100V (constant voltage) for 1 hour, the gel image stained with protein using Coomassie Brilliant Blue is shown in FIG.
- lane M is a marker lane
- lane 1 is a lane in which a lysate before purification was run
- lane 2 is a lane in which the non-protein fraction in the above purification procedure was run
- lane 3 is a lane in which the protein fraction was run.
- Antibodies were prepared by administering the fusion protein prepared in Example 2 to rabbits (Japanese white, female).
- the fusion protein was administered by intradermal injection together with 0.3 mg of a complete Freund's adjuvant six times every two weeks, and IgG antibody was purified and obtained from the blood.
- IgG antibody For purification of IgG antibody, use Affi-Gel Protein A MAPS II Kit (Bio-Rad) And the method described in the manual. That is, Affi-Gel protein A agarose equilibrated with the binding buffer (adjusted to pH 9.0) attached to the kit was packed in the column.
- an equivalent amount of binding buffer was added to the serum of the rabbit immunized with the fusion protein, and then added to the column to allow the rabbit IgG to be adsorbed to Affi-Gel protein A agarose.
- elute IgG is eluted with the elution buffer (adjusted to pH 3.0) included in the kit, dialyzed with phosphate buffered saline (pH 7.4), and concentrated to 1 Omg / ml. It was used as a purified IgG antibody.
- n 3 mean ⁇ SD
- FIG. 4 is a hydroxyapatite lOmg coated with saliva, S. sobrinus (bacterial number 3 X 1 0 7) and Ka ⁇ E IgG antibodies, 3 hours, measured after incubation at 37 ° C for the hydroxyapatite 4 is a graph showing the relationship between the number of bacteria adherent to the cells and the amount of IgG antibody added g). Table 1 shows the measured values of the number of adherent bacteria at each amount of IgG antibody added.
- the anti-PAgA-GTF-IGB IgG in the figure is an IgG antibody prepared as described in (1) above, and is a preimmunized IgG (hereinafter sometimes referred to as "preimm. IgG").
- Is an IgG antibody purified from the blood of non-immunized egrets to which no fusion protein is administered.
- contorol is a measured value when no IgG antibody was added.
- Saliva coated hydroxyapatite The, for the same state as the tooth surface in the oral cavity, the ceramic beads surfaced with Bruno tight a tooth surface component (manufactured by diameter 80 beta m, Biorad Corp.) soaked in saliva, 1 hour, 37 ° The one kept at C was used.
- the number of adherent bacteria was determined by fluorescently labeling S. sobrinus with BCECF-AM (2 ', 7_bis [2_carboxyethyl] _5 [6] _carboxyfluorescemacetoxymethyl thyl ester) and attaching to hydroxyapatite after the attachment reaction time. was obtained by measuring with a photo counter.
- preimm IgG deposition number of bacteria during addition can 1. 0 X 10 7 -. To 0.7 of which was a X 10 7, anti PAgA-GTF- When IGB IgG was added, the ratio was 0.6 ⁇ 10 7 —0.2 ⁇ 10 7 , and there was a statistically significant difference in the number of adherent bacteria at each amount of IgG added (P 0.05). From this, it was confirmed that the adhesion of S. sobrinus to saliva-coated hydroxyapatite was significantly suppressed by anti-PAgA-GTF-IGB IgG.
- the fusion protein of the present invention for example, by administering to a human as a pharmaceutical composition containing the fusion protein of the present invention as an active ingredient, the immune response of a human or the like can be improved.
- the fusion protein according to the present invention it becomes possible to efficiently generate and recover a plurality of types of antibodies involved in inhibiting the adhesion of S. sobrinus to the tooth surface from mammals.
- the adhesion of S. sobrinus to the tooth surface is inhibited, or the metabolism of bacteria is inhibited, and the phagocytosis of bacteria by leukocytes and the like is brought about.
- Prevent caries Therefore, it is possible to easily prevent caries without administering a vaccine containing the fusion protein by subcutaneous injection or the like for the purpose of caries prevention by the antibody.
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Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005506025A JPWO2004099418A1 (ja) | 2003-05-12 | 2004-05-12 | 融合蛋白質 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003-132892 | 2003-05-12 | ||
| JP2003132892A JP2004329163A (ja) | 2003-05-12 | 2003-05-12 | 融合蛋白質 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2004099418A1 true WO2004099418A1 (ja) | 2004-11-18 |
| WO2004099418A8 WO2004099418A8 (ja) | 2004-12-29 |
Family
ID=33432178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2004/006393 Ceased WO2004099418A1 (ja) | 2003-05-12 | 2004-05-12 | 融合蛋白質 |
Country Status (2)
| Country | Link |
|---|---|
| JP (2) | JP2004329163A (ja) |
| WO (1) | WO2004099418A1 (ja) |
-
2003
- 2003-05-12 JP JP2003132892A patent/JP2004329163A/ja active Pending
-
2004
- 2004-05-12 JP JP2005506025A patent/JPWO2004099418A1/ja active Pending
- 2004-05-12 WO PCT/JP2004/006393 patent/WO2004099418A1/ja not_active Ceased
Non-Patent Citations (3)
| Title |
|---|
| ABO H, ET AL: "Peptide sequences for sucrose splitting and glucan binding within streptococcus sobrinus glucosyltransferase (water-insoluble glucan synthetase)", JOURNAL OF BACTERIOLOGY, vol. 173, no. 3, 1991, pages 989 - 996, XP001051161 * |
| TOKUDA M, ET AL: "Complete nucleotide sequence of the gene for a surface protein antigen of streptococcus sobrinus", INFECTION AND IMMUNITY, vol. 59, no. 9, 1991, pages 3309 - 3312, XP002980531 * |
| YU H., ET AL: "Effects of antibodies against cell surface protein antigen PAc-glucosyltransferase fusion proteins on glucan synthesis and cell adhesion of streptococcus mutans", INFECTION AND IMMUNITY, vol. 65, no. 6, 1997, pages 2292 - 2298, XP002980530 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2004099418A1 (ja) | 2006-07-13 |
| WO2004099418A8 (ja) | 2004-12-29 |
| JP2004329163A (ja) | 2004-11-25 |
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