WO2001048000A1 - Nouveau polypeptide, fibronectine 10 de type ii, et polynucleotide codant pour ce polypeptide - Google Patents
Nouveau polypeptide, fibronectine 10 de type ii, et polynucleotide codant pour ce polypeptide Download PDFInfo
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- WO2001048000A1 WO2001048000A1 PCT/CN2000/000685 CN0000685W WO0148000A1 WO 2001048000 A1 WO2001048000 A1 WO 2001048000A1 CN 0000685 W CN0000685 W CN 0000685W WO 0148000 A1 WO0148000 A1 WO 0148000A1
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- polypeptide
- polynucleotide
- fibronectin type
- sequence
- seq
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/78—Connective tissue peptides, e.g. collagen, elastin, laminin, fibronectin, vitronectin or cold insoluble globulin [CIG]
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
Definitions
- the present invention belongs to the field of biotechnology. Specifically, the present invention describes a novel polypeptide, fibronectin type II 10, and a polynucleotide sequence encoding the polypeptide. The invention also relates to a preparation method and application of the polynucleotide and polypeptide.
- cytoskeleton At the cellular level, many biological processes require the involvement of the cytoskeleton. This includes mitosis, cell movement, cytoplasmic tissue, intracellular organelle movement, and maintenance of cell shape. In addition, membrane-related functions, such as endocytosis, exocytosis, membrane flexibility, and membrane topological properties are also achieved by the correct function of the cytoskeleton.
- Fibronectin is an extracellular glycoprotein that plays an important role in physiological processes such as cell support and movement, which affects the normal function of biological tissues and is related to the occurrence of many diseases (Structure 1997 Mar 15; 5 (3): 359-70)schreib
- Fibronectin is a plasma protein that binds to the cell surface and can form complexes with collagen, fibrin, heparin, DNA, and actin.
- the sequence of fibronectin includes three functional domains Repetitions are called Type I, Type II, and Type III (SkorstengaardK., Jensen MS, Sahl P., Petersen TE, Magnusson S. Eur. J. Biochem. 161: 441-453 (1986)).
- Type II fibronectin collagen-binding domain (also known as F2 protein) is about 40 amino acid residues, including four conserved cysteine residues. Bonded, they are the main component of the collagen-binding domain of fibronectin.
- fibronectin-type II domains contain a conserved region that contains the following identical sequence fragments: Cx (:) -PFX- [FYWI] -X (7) -Cx (8, 10)- WCx (4)-[DNSR]-[FYW] -x (3,5)-[FYW] -x- [FYWI] -C.
- This type of sequence is contained in the type II functional domains of fibronectin in many different organisms. This structural motif plays a very important role in the process of the protein's normal physiological function.
- fibronectin type II domain also exists in many proteins, including hemagglutination factor XII, type IV collagenase, etc. (Collier IE, WilhelmS.M., Eisen AZ, Marmer BL, Grant GA , Seltzer JL, ronberger A., He C., Bauer EA, Goldberg GIJ Biol. Chem. 263: 6579-6587 (1988)) 0
- Fibronectin type II functional domain Functions include: (1) As a component of fibronectin, it plays an important role in the function of fibronectin; (2) It may have a certain collagen protease activity.
- fibronectin type II 10 proteins play an important role in important functions of the body as described above, and it is believed that a large number of proteins are involved in these regulatory processes, there has been a need in the art to identify more fibronectin type II 10 involved in these processes Protein, especially the amino acid sequence of this protein. Isolation of the new fibronectin type II 10 protein-coding gene also provides the basis for research to determine the role of this protein in health and disease states. This protein may form the basis for the development of diagnostic and / or therapeutic drugs for diseases, so isolating its coding DNA is important. Object of the invention
- Another object of the invention is to provide a polynucleotide encoding the polypeptide.
- Another object of the present invention is to provide a recombinant vector containing a polynucleotide encoding a fibronectin type ⁇ 10.
- Another object of the present invention is to provide a method for producing a fibronectin type ⁇ 10.
- Another object of the present invention is to provide an antibody against the polypeptide of the present invention, a fibronectin type II10.
- Another object of the present invention is to provide mimic compounds, antagonists, agonists, and inhibitors directed to the polypeptide of the present invention, fibronectin type ⁇ 10.
- Another object of the present invention is to provide a method for diagnosing and treating diseases associated with abnormalities in fibronectin type ⁇ 10. Summary of invention
- the present invention relates to an isolated polypeptide, which is of human origin and comprises: a polypeptide having the amino acid sequence of SEQ ID No. 2, or a conservative variant, biologically active fragment or derivative thereof.
- the polypeptide is a polypeptide having the amino acid sequence of SEQ ID NO: 2.
- the invention also relates to an isolated polynucleotide comprising a nucleotide sequence or a variant thereof selected from the group consisting of:
- sequence of the polynucleotide is one selected from the group consisting of: (a) a sequence having positions 377-640 in SEQ ID NO: 1; and (b) a sequence having positions 1-902 in SEQ ID NO: 1 Sequence of bits.
- the invention further relates to a vector, in particular an expression vector, containing the polynucleotide of the invention; a host cell genetically engineered with the vector, including a transformed, transduced or transfected host cell; and a method comprising culturing said Host cell and method of preparing the polypeptide of the present invention by recovering the expression product.
- a vector in particular an expression vector, containing the polynucleotide of the invention
- a host cell genetically engineered with the vector including a transformed, transduced or transfected host cell
- a method comprising culturing said Host cell and method of preparing the polypeptide of the present invention by recovering the expression product.
- the invention also relates to an antibody capable of specifically binding to a polypeptide of the invention.
- the invention also relates to a method for screening compounds that mimic, activate, antagonize or inhibit the activity of fibronectin type I I 10 protein, which comprises utilizing the polypeptide of the invention.
- the invention also relates to compounds obtained by this method.
- the invention also relates to a method for in vitro detection of a disease or susceptibility to a disease associated with abnormal expression of a fibronectin type ⁇ 10 protein, comprising detecting a mutation in the polypeptide or a polynucleotide sequence encoding the same in a biological sample, or detecting a biological The amount or biological activity of a polypeptide of the invention in a sample.
- the invention also relates to a pharmaceutical composition
- a pharmaceutical composition comprising a polypeptide of the invention or a mimetic thereof, an activator, an antagonist or an inhibitor, and a pharmaceutically acceptable carrier.
- the present invention also relates to the use of the polypeptide and / or polynucleotide of the present invention in the preparation of a medicament for treating cancer, developmental disease or immune disease or other diseases caused by abnormal expression of fibronectin type ⁇ 10.
- FIG. 1 is a comparison diagram of amino acid sequence homology of the fibronectin type I I 10 of the present invention with a total of 72 amino acids and domain fibronectin type ⁇ characteristic proteins at 16-87.
- the upper sequence is the fibronectin type I I 10 and the lower sequence is the fibronectin type I I characteristic protein domain.
- " And ":” and ".” Indicate that the probability of the same amino acid appearing between two sequences decreases in sequence.
- FIG. 2 is a polyacrylamide gel electrophoresis image (SDS-PAGE) of an isolated fibronectin type I I 10. 10kDa is the molecular weight of the protein. The arrow indicates the isolated protein band.
- Nucleic acid sequence refers to an oligonucleotide, a nucleotide or a polynucleotide and a fragment or part thereof, and may also refer to a genomic or synthetic DNA or RNA, they can be single-stranded or double-stranded, representing the sense or antisense strand.
- amino acid sequence refers to an oligopeptide, peptide, polypeptide or protein sequence and fragments or portions thereof.
- amino acid sequence in the present invention relates to the amino acid sequence of a naturally occurring protein molecule, such "polypeptide” or “protein” does not mean to limit the amino acid sequence to a complete natural amino acid related to the protein molecule .
- a protein or polynucleotide “variant” refers to an amino acid sequence having one or more amino acids or nucleotide changes or a polynucleotide sequence encoding it. The changes may include deletions, insertions or substitutions of amino acids or nucleotides in the amino acid sequence or nucleotide sequence. Variants can have "conservative" changes in which the substituted amino acid has a structural or chemical property similar to the original amino acid, such as the replacement of isoleucine with leucine. Variants can also have non-conservative changes, such as replacing glycine with tryptophan.
- “Deletion” refers to the deletion of one or more amino acids or nucleotides in an amino acid sequence or nucleotide sequence.
- Insertion means that a change in the amino acid sequence or nucleotide sequence results in an increase in one or more amino acids or nucleotides compared to a molecule that exists in nature.
- Replacement refers to the replacement of one or more amino acids or nucleotides with different amino acids or nucleotides.
- Bioactivity refers to a protein that has the structure, regulation, or biochemical function of a natural molecule.
- immunologically active refers to natural, recombinant or synthetic proteins and fragments thereof in suitable The ability to induce a specific immune response in an animal or cell and to bind to specific antibodies.
- An "agonist” refers to a molecule that, when combined with fibronectin type ⁇ 10, causes a change in the protein to regulate the activity of the protein.
- An agonist may include a protein, a nucleic acid, a carbohydrate, or any other molecule that can bind to a fibronectin type II10.
- Antagonist refers to a molecule that, when combined with fibronectin type II 10, can block or regulate the biological or immunological activity of fibronectin type II 10.
- Antagonists and inhibitors may include proteins, nucleic acids, carbohydrates, or any other molecule that can bind fibronectin type II10.
- Regular refers to a change in the function of fibronectin type I I 10, including an increase or decrease in protein activity, a change in binding characteristics, and any other biological, functional, or immune properties of fibronectin type I I 10.
- substantially pure means substantially free of other proteins, lipids, sugars or other substances with which it is naturally associated.
- Those skilled in the art can purify fibronectin type I I 10 using standard protein purification techniques.
- the essentially pure fibronectin type I I 10 produces a single main band on a non-reducing polyacrylamide gel.
- the purity of the fibronectin type I I 10 polypeptide can be analyzed by amino acid sequence.
- Complementary refers to the natural binding of polynucleotides by base-pairing under conditions of acceptable salt concentration and temperature.
- sequence C-T-G-A
- complementary sequence G-A-C-T
- the complementarity between two single-stranded molecules can be partial or complete.
- the degree of complementarity between nucleic acid strands has a significant effect on the efficiency and strength of hybridization between nucleic acid strands.
- “Homology” refers to the degree of complementarity and can be partially homologous or completely homologous.
- Partial homology refers to a partially complementary sequence that at least partially inhibits hybridization of a fully complementary sequence to a target nucleic acid. This inhibition of hybridization can be detected by performing hybridization (Southern blotting or Nor thern blotting, etc.) under conditions of reduced stringency.
- Substantially homologous sequences or hybridization probes can compete and inhibit the binding of completely homologous sequences to the target sequence under conditions of reduced stringency. This does not mean that the conditions of reduced stringency allow non-specific binding, because the conditions of reduced stringency require that the two sequences bind to each other as a specific or selective interaction.
- Percent identity refers to the percentage of sequences that are identical or similar in the comparison of two or more amino acid or nucleic acid sequences. The percent identity can be determined electronically, such as by the MEGALIGN program (Lasergene sof tware package, DNASTAR, Inc., Madi son Wis.). 0 The MEGALIGN program can compare two or more sequences according to different methods, such as the Clus ter method ( Higgins, DG and PM Sharp (1988) Gene 73: 237-244). The Clus ter method arranges groups of sequences into clusters by checking the distance between all pairs. The clusters are then assigned in pairs or groups. Percent identity between two amino acid sequences such as sequence A and sequence B The score is calculated by the following formula: Number of residues matching between sequence 3
- the number of residues in a sequence-the number of spacers-the number of spacer residues in the sequence can also be determined by the Clus ter method or by methods known in the art such as Jotun Hein (Hein J., ( 1990) Methods in enzymology 183: 625-645) relations
- Similarity refers to the degree of identical or conservative substitutions of amino acid residues at corresponding positions in the alignment of amino acid sequences.
- Amino acids used for conservative substitutions for example, negatively charged amino acids may include aspartic acid and glutamic acid; positively charged amino acids may include lysine and arginine; Similar hydrophilic amino acids may include leucine, isoleucine and valine; glycine and alanine; asparagine and glutamine; serine and threonine; phenylalanine and tyrosine.
- Antisense refers to a nucleotide sequence that is complementary to a particular DNA or R sequence.
- the "antisense strand” refers to a nucleic acid strand that is complementary to the “sense strand”.
- Derivative refers to HFP or a chemical modification of its nucleic acid. This chemical modification may be the replacement of a hydrogen atom with an alkyl, acyl or amino group. Nucleic acid derivatives can encode polypeptides that retain the main biological properties of natural molecules.
- Antibody refers to an intact antibody molecules and fragments thereof, such as Fa, F (a b ') 2 and F V, which is capable of specifically binding the fibronectin type II antigenic determinant 10.
- a “humanized antibody” refers to an antibody in which the amino acid sequence of a non-antigen binding region is replaced to become more similar to a human antibody, but still retains the original binding activity.
- isolated refers to the removal of matter from its original environment (for example, its natural environment if it is naturally occurring).
- a naturally occurring polynucleotide or polypeptide is not isolated when it is present in a living animal, but the same polynucleotide or polypeptide is separated from some or all of the substances that coexist in the natural system.
- Such a polynucleotide may be part of a vector, or such a polynucleotide or polypeptide may be part of a composition. Since the carrier or composition is not part of its natural environment, they are still isolated.
- isolated refers to the separation of a substance from its original environment (if it is a natural substance, the original environment is the natural environment).
- polynucleotides and polypeptides in a natural state in a living cell are not isolated and purified, but the same polynucleotides or polypeptides are separated and purified if they are separated from other substances existing in the natural state. .
- isolated fibronectin type II 10 means that fibronectin type II 10 is substantially free of other proteins, lipids, carbohydrates, or other substances with which it is naturally associated. Skill in the field Surgeons can purify fibronectin type ⁇ 10 using standard protein purification techniques. Substantially pure polypeptides can produce a single main band on a non-reducing polyacrylamide gel. The purity of the fibronectin type ⁇ 10 polypeptide can be analyzed by amino acid sequence.
- the present invention provides a new polypeptide-fibronectin type ⁇ 10, which is basically composed of the amino acid sequence shown in SEQ ID NO: 2.
- the polypeptide of the present invention may be a recombinant polypeptide, a natural polypeptide, or a synthetic polypeptide, and preferably a recombinant polypeptide.
- the polypeptides of the invention can be naturally purified products, or chemically synthesized products, or produced using recombinant techniques from prokaryotic or eukaryotic hosts (e.g., bacteria, yeast, higher plants, insects, and mammalian cells). Depending on the host used in the recombinant production protocol, the polypeptide of the invention may be glycosylated, or it may be non-glycosylated. Polypeptides of the invention may also include or exclude starting methionine residues.
- the invention also includes fragments, derivatives and analogs of fibronectin type I I 10.
- fragment refers to a polypeptide that substantially maintains the same biological function or activity of the fibronectin type I I 10 of the present invention.
- a fragment, derivative or analog of the polypeptide of the present invention may be: (I) a kind in which one or more amino acid residues are substituted with conservative or non-conservative amino acid residues (preferably conservative amino acid residues), and the substitution
- the amino acid may or may not be encoded by a genetic codon; or ( ⁇ ) such a type in which one or more amino acid residues are substituted with other groups to include a substituent; or (III) such A type in which a mature polypeptide is fused to another compound (such as a compound that extends the half-life of a polypeptide, such as polyethylene glycol); or (IV) a type of polypeptide sequence in which an additional amino acid sequence is fused into a mature polypeptide ( Such as a leader sequence or a secreted sequence or a sequence used to purify this polypeptide or a protein sequence).
- such fragments, derivatives and analogs are considered to be within the knowledge of those skilled in the art.
- the present invention provides an isolated nucleic acid (polynucleotide), which basically consists of a polynucleotide encoding a polypeptide having the amino acid sequence of SEQ ID NO: 2.
- the polynucleotide sequence of the present invention includes a nucleotide sequence of SEQ ID NO: 1.
- the polynucleotide of the present invention is found from a cDNA library of human fetal brain tissue. It contains a polynucleotide sequence of 902 bases in total length and its open reading frame of 377-640 encodes 87 amino acids.
- This polypeptide has a characteristic sequence of a fibronectin type I I characteristic protein, and it can be deduced that the fibronectin type I I 10 has a structure and function represented by a fibronectin type II characteristic protein.
- the polynucleotide of the present invention may be in the form of DNA or RNA.
- DNA forms include cDNA, genomic DNA, or synthetic DNA.
- DNA can be single-stranded or double-stranded.
- DNA can be coding or non-coding.
- the coding region sequence encoding the mature polypeptide may be the same as the coding region sequence shown in SEQ ID NO: 1 or a degenerate variant.
- a "degenerate variant" refers to a nucleic acid sequence encoding a protein or polypeptide having SEQ ID NO: 2 but different from the coding region sequence shown in SEQ ID NO: 1 in the present invention.
- the polynucleotide encoding the mature polypeptide of SEQ ID NO: 2 includes: only the coding sequence of the mature polypeptide; the coding sequence of the mature polypeptide and various additional coding sequences; the coding sequence of the mature polypeptide (and optional additional coding sequences); Coding sequence.
- polynucleotide encoding a polypeptide refers to a polynucleotide that includes the polypeptide and a polynucleotide that includes additional coding and / or non-coding sequences.
- the invention also relates to variants of the polynucleotides described above, which encode polypeptides or fragments, analogs and derivatives of polypeptides having the same amino acid sequence as the invention.
- This polynucleotide variant can be a naturally occurring allelic variant or a non-naturally occurring variant.
- These nucleotide variants include substitution variants, deletion variants, and insertion variants.
- an allelic variant is an alternative form of a polynucleotide that may be a substitution, deletion, or insertion of one or more nucleotides, but does not substantially change the function of the polypeptide it encodes .
- the invention also relates to a polynucleotide that hybridizes to the sequence described above (having at least 50%, preferably 70% identity between the two sequences).
- the present invention particularly relates to polynucleotides that can hybridize to the polynucleotides of the present invention under stringent conditions.
- “strict conditions” means: (1) hybridization and elution at lower ionic strength and higher temperature, such as 0.2xSSC, 0.1% SDS, 6 (TC; or (2) Add denaturants during hybridization, such as 50% (v / v) formamide, 0.1% calf serum / 0.1% Ficol 1, 42 ° C, etc .; or (3) only between two sequences Hybridization occurs only when the identity is at least 95%, and more preferably 97%.
- the polypeptide encoded by the hybridizable polynucleotide has the same biological function and activity as the mature polypeptide shown in SEQ ID NO: 2.
- nucleic acid fragments that hybridize to the sequences described above.
- a "nucleic acid fragment” contains at least 10 nucleotides in length, preferably at least 20-30 nucleotides, more preferably at least 50-60 nucleotides, and most preferably at least 100 nuclei. Glycylic acid or more. Nucleic acid fragments can also be used in nucleic acid amplification techniques (such as PCR) to identify and / or isolate polynucleotides encoding fibronectin type I I 10.
- polypeptides and polynucleotides in the present invention are preferably provided in an isolated form and are more preferably purified to homogeneity.
- the specific polynucleotide sequence encoding the fibronectin type ⁇ 1 0 of the present invention can be obtained by various methods.
- polynucleotides are isolated using hybridization techniques well known in the art. These techniques include, but are not limited to: 1) hybridization of probes to genomic or cDNA libraries to detect homologous polynucleotide sequences, and 2) antibody screening of expression libraries to detect cloned polynucleosides with common structural characteristics Acid fragments.
- the DM fragment sequence of the present invention can also be obtained by the following methods: 1) isolating the double-stranded DNA sequence from the genomic DNA; 2) chemically synthesizing the DNA sequence to obtain the double-stranded DNA of the polypeptide.
- genomic DM is the least commonly used. Direct chemical synthesis of DM sequences is often the method of choice.
- the more commonly used method is the isolation of cDNA sequences.
- the standard method for isolating cDNA of interest is to isolate raRM from donor cells that overexpress the gene and perform reverse transcription to form a plasmid Or phage cDNA library.
- the construction of cDNA libraries is also a common method (Sambrook, et al., Molecu la r Cloning, A Laboratory Manua, Cold Spruing Harbor Labora tory. New York, 1989).
- Commercially available cDNA libraries are also available, such as different cDNA libraries from Clontech. When polymerase reaction technology is used in combination, even very small expression products can be cloned.
- genes of the present invention can be selected from these cDNA libraries by conventional methods. These methods include (but are not limited to): (l) DNA-DNA or DNA-RNA hybridization; (2) the presence or absence of marker gene function; (3) determination of the level of transcripts of fibronectin type II 10; (4) ) Detection of protein products expressed by genes through immunological techniques or determination of biological activity. The above methods can be used alone or in combination.
- the probe used for hybridization is homologous to any part of the polynucleotide of the present invention, and its length is at least 10 nucleotides, preferably at least 30 nucleotides, more preferably At least 50 nucleotides, preferably at least 100 nucleotides.
- the length of the probe is usually within 2000 nucleotides, preferably within 1000 nucleotides.
- the probe used here is usually a DNA sequence chemically synthesized based on the gene sequence information of the present invention.
- the genes or fragments of the present invention can of course be used as probes.
- DNA probes can be labeled with radioisotopes, luciferin, or enzymes (such as alkaline phosphatase).
- the protein products of the fibronectin type I 10 gene expression can be detected by immunological techniques such as Western blotting, radioimmunoprecipitation, and enzyme-linked immunosorbent assay (ELISA).
- immunological techniques such as Western blotting, radioimmunoprecipitation, and enzyme-linked immunosorbent assay (ELISA).
- a method (Sa iki, et al. Sc; 1985; 230: 1350-1354) using PCR technology to amplify DNA / RNA is preferably used to obtain the gene of the present invention.
- the RACE method RACE-cDM terminal rapid amplification method
- the primers used for PCR can be appropriately based on the polynucleotide sequence information of the present invention disclosed herein. Select and synthesize using conventional methods.
- the amplified DNA / RNA fragments can be isolated and purified by conventional methods such as by gel electrophoresis.
- polynucleotide sequence of the gene of the present invention or various DNA fragments and the like obtained as described above can be measured by a conventional method such as dideoxy chain termination method (Sanger et al. PNAS, 1977, 74: 5463-5467). Such polynucleotide sequences can also be determined using commercial sequencing kits and the like. In order to obtain the full-length cDNA sequence, sequencing needs to be repeated. Sometimes it is necessary to determine the cDNA sequence of multiple clones in order to splice into a full-length cDNA sequence.
- the present invention also relates to a vector comprising a polynucleotide of the present invention, and a host cell genetically engineered using the vector of the present invention or directly using a fibronectin type II 10 coding sequence, and a recombinant technology for producing a polypeptide of the present invention. method.
- a polynucleotide sequence encoding a fibronectin type II 10 may be inserted into a vector to constitute a recombinant vector containing the polynucleotide of the present invention.
- vector refers to bacterial plasmids, phages, yeast plasmids, plant cell viruses, mammalian cell viruses such as adenoviruses, retroviruses, or other vectors well known in the art.
- Vectors suitable for use in the present invention include, but are not limited to: T7 promoter-based expression vectors expressed in bacteria (Rosenberg, et al. Gene, 1987, 56: 125); pMSXND expression vectors expressed in mammalian cells ( Lee and Na thans, J Bio Chem. 263: 3521, 1988) and baculovirus-derived vectors expressed in insect cells.
- any plasmid and vector can be used to construct a recombinant expression vector.
- An important feature of expression vectors is that they usually contain an origin of replication, a promoter, a marker gene, and translational regulatory elements.
- Methods known to those skilled in the art can be used to construct expression vectors containing a DNA sequence encoding a fibronectin type II 10 and appropriate transcription / translation regulatory elements. These methods include in vitro recombinant DNA technology, DNA synthesis technology, and in vivo recombination technology (Sambroook, et al. Mo l ecu l ar C l on ing, a Labora tory Manua l, Co ld Spr ing Harbor Labora tory. New York, 1989).
- the DNA sequence can be operably linked to an appropriate promoter in an expression vector to guide mRNA synthesis. Representative examples of these promoters are: l ac or trp promoter of E.
- the expression vector also includes a ribosome binding site for translation initiation, a transcription terminator, and the like. Insertion of enhancer sequences into the vector will enhance its transcription in higher eukaryotic cells. Enhancers are cis-acting factors for DNA expression, usually about 10 to 300 base pairs, which act on promoters to enhance gene transcription. Illustrative examples include SV40 enhancers from 100 to 270 base pairs on the late side of the origin of replication, polyoma enhancers and adenovirus enhancers on the late side of the origin of replication.
- the expression vector preferably contains one or more selectable marker genes to provide phenotypic traits for selection of transformed host cells, such as dihydrofolate reductase, neomycin resistance, and green for eukaryotic cell culture.
- selectable marker genes to provide phenotypic traits for selection of transformed host cells, such as dihydrofolate reductase, neomycin resistance, and green for eukaryotic cell culture.
- GFP fluorescent protein
- tetracycline or ampicillin resistance for E. coli.
- a polynucleotide encoding a fibronectin type ⁇ 1 0 or a recombinant vector containing the polynucleotide can be transformed or transduced into a host cell to constitute a genetically engineered host cell containing the polynucleotide or the recombinant vector.
- the term "host cell” refers to a prokaryotic cell, such as a bacterial cell; or a lower eukaryotic cell Cells, such as yeast cells; or higher eukaryotic cells, such as mammalian cells. Representative examples are: E.
- coli Streptomyces
- bacterial cells such as Salmonella typhimurium
- fungal cells such as yeast
- plant cells such as fly S2 or Sf 9
- animal cells such as CH0, COS or Bowes melanoma cells.
- Transformation of a host cell with a DNA sequence described in the present invention or a recombinant vector containing the DNA sequence can be performed using conventional techniques well known to those skilled in the art.
- the host is a prokaryote such as E. coli
- competent cells capable of DNA uptake can be in the exponential growth phase were harvested, treated with (Method 12, using the procedure well known in the art.
- Alternative is MgC l 2.
- transformation can also be performed by electroporation.
- the host is a eukaryotic organism, the following DM transfection methods can be used: calcium phosphate co-precipitation method, or conventional mechanical methods such as microinjection, electroporation, and liposomes Packaging, etc.
- the polynucleotide sequence of the present invention can be used to express or produce recombinant fibronectin type I I 1 0 (Scence, 1984; 224: 1431). Generally there are the following steps:
- the medium used in the culture may be selected from various conventional mediums. Culture is performed under conditions suitable for host cell growth. After the host cells have grown to an appropriate cell density, the selected promoter is induced by a suitable method (such as temperature conversion or chemical induction), and the cells are cultured for a period of time.
- a suitable method such as temperature conversion or chemical induction
- the recombinant polypeptide may be coated in a cell, expressed on a cell membrane, or secreted outside the cell. If necessary, the recombinant protein can be isolated and purified by various separation methods using its physical, chemical and other properties. These methods are well known to those skilled in the art. These methods include, but are not limited to: conventional renaturation treatment, protein precipitant treatment (salting out method), centrifugation, osmotic disruption, ultrasonic treatment, ultracentrifugation, molecular sieve chromatography (gel filtration), adsorption chromatography, ion Exchange chromatography, high performance liquid chromatography (HPLC) and various other liquid chromatography techniques and combinations of these methods.
- conventional renaturation treatment protein precipitant treatment (salting out method), centrifugation, osmotic disruption, ultrasonic treatment, ultracentrifugation, molecular sieve chromatography (gel filtration), adsorption chromatography, ion Exchange chromatography, high performance liquid
- polypeptides of the present invention can be directly used in the treatment of diseases, for example, they can be used to treat malignant tumors, adrenal deficiency, skin diseases, various types of inflammation, HIV infection, and immunological diseases.
- Fibronectin plays an important role in physiological processes such as cell support and movement, which affects the normal function of biological tissues and is related to the occurrence of many diseases (Structure 1997 Mar 15; 5 (3): 359 -70). It is a plasma protein that binds to the cell surface and interacts with collagen and fibrils. Retin, heparin, D and actin form complexes and work.
- Fibronectin type ⁇ functional domains are not only in fibronectin, but also serve as important functional structures in some proteins such as hemagglutination factor XI I and type IV collagenase (Collier IE. Et al., 1988).
- abnormal expression of polypeptides containing fibronectin type II functional domains can cause abnormal functions of proteins such as fibronectin and type IV collagenase. Since fibronectin can form complexes with collagen and fibrin, they are of great significance in the process of tissue fibrosis and inflammatory repair. Therefore, abnormal expression of the polypeptide can cause fibrosis in some tissues, and can cause abnormalities in the inflammatory repair process. Excessive scarring, narrowing of the lumen, and unhealed wounds may occur. Abnormal expression of polypeptides containing fibronectin type ⁇ functional domains can also make blood coagulation factors X ⁇ , type IV collagenase dysfunction, which can lead to abnormal coagulation system function.
- the abnormal expression of the fibronectin type ⁇ 10 of the present invention will produce various diseases, especially tissue fibrous pathological changes, diseases related to abnormal inflammation and repair, and diseases of the coagulation system. These diseases include, but are not limited to:
- Tissue fibropathology fibroids, nodular fasciitis, proliferative fasciitis, myofibromatosis, fibrosarcoma, fibrous histiocytoma, reticular histiocytoma, fibromatosis such as keloids, diffuse interstitial lung Qualitative disorders, selenium lung, cirrhosis, benign prostatic hyperplasia
- stenosis of various tissue channels such as pyloric stenosis, tracheal stenosis after injury, mitral valve stenosis, aortic stenosis, pulmonary artery stenosis, constrictive pericarditis, pancreatic cystic fibrosis, pyelonephritis
- Factor XII deficiency hemophilia A, hemophilia B, hereditary hemorrhagic telangiectasia, allergic purpura, simple purpura, senile purpura, idiopathic thrombocytopenic purpura, regeneration Obstructive anemia, disseminated intravascular coagulation
- fibronectin As fibronectin is involved in the cytoskeleton, it is closely related to mitosis, cell movement, cytoplasmic tissue, movement of organelles in the cell, and maintenance of cell shape. Therefore, the abnormal expression of polypeptides containing the fibronectin type I and I domains can cause tumor and embryo development disorders.
- the abnormal expression of the fibronectin type ⁇ 10 of the present invention will cause various diseases, especially tumors and embryonic development disorders. These diseases include, but are not limited to:
- Tumors of various tissues gastric cancer, liver cancer, lung cancer, esophageal cancer, breast cancer, leukemia, lymphoma, thyroid tumor, uterine fibroids, neuroblastoma, astrocytoma, ependymoma, glioblastoma, Colon cancer, malignant histiocytosis, teratoma, adrenal cancer, bladder cancer, bone cancer, osteosarcoma, myeloma, bone marrow cancer, brain cancer, uterine cancer, endometrial cancer, gallbladder cancer, colon cancer, thymic tumor, Nasal cavity and sinuses Tumor, nasopharyngeal cancer, laryngeal cancer, tracheal tumor, fibroid, fibrosarcoma, lipoma, liposarcoma, leiomyoma
- Embryonic disorders congenital abortion, cleft palate, limb loss, limb differentiation disorder, hyaline membrane disease, atelectasis, polycystic kidney, double ureter, cryptorchidism, congenital inguinal hernia, double uterus, vaginal atresia, suburethral Fissure, hermaphroditism, atrial septal defect, ventricular septal defect, pulmonary stenosis, arterial duct occlusion, neural tube defect, congenital hydrocephalus, iris defect, congenital cataract, congenital glaucoma or cataract, congenital deafness
- Abnormal expression of the fibronectin type I I 10 of the present invention may also cause certain genetic diseases, immune system diseases, and the like.
- the polypeptide of the present invention and the antagonists, agonists and inhibitors of the polypeptide can be directly used in the treatment of diseases, for example, it can treat various diseases, especially tissue fibrous pathology, diseases related to abnormal inflammation and repair, coagulation system diseases, tumors, and embryos. Developmental disorders, certain hereditary diseases and diseases of the immune system.
- the invention also provides methods for screening compounds to identify agents that increase (agonist) or suppress (antagonist) fibronectin type I I 10.
- Agonists enhance fibronectin type I I 10 to stimulate biological functions such as cell proliferation, while antagonists prevent and treat disorders related to excessive cell proliferation, such as various cancers.
- mammalian cells or membrane preparations expressing fibronectin type I I 10 can be cultured with labeled fibronectin type II 10 in the presence of a drug. The ability of the drug to increase or block this interaction is then determined.
- Antagonists of fibronectin type ⁇ 10 include screened antibodies, compounds, receptor deletions, and the like.
- An antagonist of fibronectin type I I 10 can bind to fibronectin type I I 10 and eliminate its function, or inhibit the production of the polypeptide, or bind to the active site of the polypeptide so that the polypeptide cannot perform a biological function.
- fibronectin type II 10 When screening compounds as antagonists, fibronectin type II 10 can be added to a bioanalytical assay to determine whether a compound is an antagonist by measuring the effect of the compound on the interaction between fibronectin type II 10 and its receptor. Receptor deletions and analogs that act as antagonists can be screened in the same manner as described above for screening compounds.
- Polypeptide molecules capable of binding to fibronectin type I I 10 can be obtained by screening a random peptide library composed of various possible combinations of amino acids bound to a solid phase. During screening, the fibronectin type ⁇ 10 molecule should generally be labeled.
- the present invention provides a method for producing an antibody using a polypeptide, a fragment, a derivative, an analog thereof, or a cell thereof as an antigen.
- These antibodies can be polyclonal or monoclonal antibodies.
- the invention also provides antibodies against fibronectin type II 10 epitopes. These antibodies include (but are not limited to): polyclonal antibodies, monoclonal antibodies, chimeric antibodies, single chain antibodies, Fab fragments and Fab expression libraries. Raw fragment.
- Polyclonal antibodies can be produced by injecting fibronectin type ⁇ 10 directly into immunized animals (such as rabbits, mice, rats, etc.).
- immunized animals such as rabbits, mice, rats, etc.
- a variety of adjuvants can be used to enhance the immune response, including but not limited to Freund's adjuvant. Wait.
- Techniques for preparing monoclonal antibodies of fibronectin type ⁇ 10 include, but are not limited to, hybridoma technology (Kohl er and Miste in. Nature, 1975, 256: 495-497), triple tumor technology, human beta-cell hybridization Tumor technology, EBV-hybridoma technology, etc.
- Chimeric antibodies that bind human constant regions and non-human-derived variable regions can be produced using existing techniques (Morrison et al, PNAS, 1985, 81: 6851).
- the existing technology for producing single chain antibodies U.S. Pat No. 4946778, can also be used to produce single chain antibodies against fibronectin type I I 10.
- Anti-fibronectin type I I 10 antibodies can be used in immunohistochemistry to detect fibronectin type I I 10 in biopsy specimens.
- Monoclonal antibodies that bind to fibronectin type I I 10 can also be labeled with radioisotopes and injected into the body to track their location and distribution. This radiolabeled antibody can be used as a non-invasive diagnostic method to locate tumor cells and determine whether there is metastasis.
- Antibodies can also be used to design immunotoxins that target a particular part of the body.
- fibronectin type I I 10 high affinity monoclonal antibodies can covalently bind to bacterial or phytotoxins (such as diphtheria toxin, ricin, ormosine, etc.).
- a common method is to attack the amino group of an antibody with a thiol cross-linking agent such as SPDP and bind the toxin to the antibody through the exchange of disulfide bonds.
- This hybrid antibody can be used to kill fibronectin type ⁇ 10 positive cells .
- the antibodies of the present invention can be used to treat or prevent diseases related to fibronectin type II10. Administration of appropriate doses of antibodies can stimulate or block the production or activity of fibronectin type I I 10.
- the invention also relates to a diagnostic test method for the quantitative and localized detection of fibronectin type ⁇ 10 levels.
- tests are well known in the art and include FISH assays and radioimmunoassays.
- the levels of fibronectin type I I 10 detected in the test can be used to explain the importance of fibronectin type I I 10 in various diseases and to diagnose diseases in which fibronectin type ⁇ 10 plays a role.
- polypeptide of the present invention can also be used for peptide mapping analysis.
- the polypeptide can be specifically cleaved by physical, chemical or enzymatic analysis, and subjected to one-dimensional or two-dimensional or three-dimensional gel electrophoresis analysis, and more preferably mass spectrometry analysis.
- Polynucleotides encoding fibronectin type II 10 can also be used for a variety of therapeutic purposes. Gene therapy techniques can be used to treat abnormalities in cell proliferation, development, or metabolism due to non-expression or abnormal / inactive expression of fibronectin type II10. Recombinant gene therapy vectors (such as viral vectors) can be designed Used to express variant fibronectin type II 10 to inhibit endogenous fibronectin type II 10 activity. For example, a variant fibronectin type II 10 may be a shortened fibronectin type II 10 lacking a signaling domain, and although it can bind to downstream substrates, it lacks signaling activity.
- the recombinant gene therapy vector can be used for treating diseases caused by abnormal expression or activity of fibronectin type ⁇ 10.
- Virus-derived expression vectors such as retrovirus, adenovirus, adenovirus-associated virus, herpes simplex virus, parvovirus, etc. can be used to encode the type of fibronectin
- the I I 10 polynucleotide is transferred into the cell.
- Methods for constructing recombinant viral vectors carrying a polynucleotide encoding a fibronectin type ⁇ 10 can be found in the existing literature (Sambrook, et al.).
- the polynucleotide encoding the fibronectin type I I 10 can be packaged into liposomes and transferred into cells.
- Methods for introducing a polynucleotide into a tissue or cell include: directly injecting the polynucleotide into a tissue in vivo; or introducing the polynucleotide into a cell in vitro through a vector (such as a virus, phage, or plasmid), and then transplanting the cell Into the body and so on.
- a vector such as a virus, phage, or plasmid
- Oligonucleotides including antisense RNA and DNA
- ribozymes that inhibit fibronectin type I I 10 mRNA are also within the scope of the present invention.
- a ribozyme is an enzyme-like RNA molecule that specifically decomposes specific RNA. Its mechanism of action is that the ribozyme molecule specifically hybridizes with a complementary target RNA for endonucleation.
- Antisense RNA, DNA, and ribozymes can be obtained using any existing RNA or DNA synthesis technology, such as solid-phase phosphoramidite chemical synthesis to synthesize oligonucleotides.
- Antisense RNA molecules can be obtained by in vitro or in vivo transcription of a DNA sequence encoding the RNA.
- This DNA sequence has been integrated downstream of the vector's RNA polymerase promoter.
- it can be modified in a variety of ways, such as increasing the sequence length on both sides, and the linkage between ribonucleosides using phosphate thioester or peptide bonds instead of phosphodiester bonds.
- Polynucleotides encoding fibronectin type II 10 are useful in the diagnosis of diseases associated with fibronectin type II 10.
- a polynucleotide encoding a fibronectin type II 10 can be used to detect the expression of fibronectin type II 10 or the abnormal expression of fibronectin type II 10 in a disease state.
- the DNA sequence encoding fibronectin type II 10 can be used to hybridize biopsy specimens to determine the expression status of fibronectin type II 10.
- Hybridization techniques include Southern blotting, Nor thern blotting, and in situ hybridization. These techniques and methods are publicly available and mature, and related kits are commercially available.
- a part or all of the polynucleotides of the present invention can be used as probes to be fixed on a micro array or a DNA chip (also called a "gene chip") for analyzing differential expression analysis and gene diagnosis of genes in tissues.
- Fibronectin type II 10 specific primers for RNA-polymerase chain reaction (RT-PCR) in vitro amplification can also detect the transcription products of fibronectin type II 10.
- Detection of mutations in the fibronectin type II 10 gene can also be used to diagnose fibronectin type II 10 related diseases.
- Forms of fibronectin type II 10 mutations include point mutations, translocations, deletions, recombinations, and any other abnormalities compared to normal wild-type fibronectin type II 10 DNA sequences. Mutations can be detected using existing techniques such as Southern blotting, DNA sequence analysis, PCR and in situ hybridization. In addition, mutations may affect protein expression, so Northern blotting and Western blotting can be used to indirectly determine whether a gene
- sequences of the invention are also valuable for chromosome identification. This sequence will specifically target a specific position on a human chromosome and can hybridize to it. Currently, specific sites for each gene on the chromosome need to be identified. Currently, only a few chromosome markers based on actual sequence data (repeating polymorphisms) are available for marking chromosome positions. According to the present invention, in order to associate these sequences with disease-related genes, an important first step is to locate these DNA sequences on a chromosome.
- PCR primers (preferably 15-35bp) are prepared from the cDNA, and the sequences can be located on the chromosomes. These primers were then used for PCR screening of somatic hybrid cells containing individual human chromosomes. Only those heterozygous cells containing the human gene corresponding to the primer will produce amplified fragments.
- PCR localization of somatic hybrid cells is a quick way to localize DNA to specific chromosomes.
- oligonucleotide primers of the present invention in a similar manner, a set of fragments from a specific chromosome or a large number of genomic clones can be used to achieve sublocalization.
- Other similar strategies that can be used for chromosomal localization include in situ hybridization, chromosome pre-screening with labeled flow sorting, and pre-selection of hybridization to construct chromosome-specific cDNA libraries.
- Fluorescent in situ hybridization of cDNA clones with metaphase chromosomes allows precise chromosomal localization in one step.
- FISH Fluorescent in situ hybridization
- the differences in cDNA or genomic sequences between the affected and unaffected individuals need to be determined. If a mutation is observed in some or all diseased individuals and the mutation is not observed in any normal individuals, the mutation may be the cause of the disease. Comparing affected and unaffected individuals usually involves first looking for structural changes in the chromosome, such as deletions or translocations that are visible at the chromosomal level or detectable using cDNA sequence-based PCR. Based on the resolution capabilities of current physical mapping and gene mapping technologies, The cDNA of the disease-related chromosomal region can be one of 50 to 500 potentially pathogenic genes (assuming 1 megabase mapping resolution and one gene per 20 kb).
- the polypeptides, polynucleotides and mimetics, agonists, antagonists and inhibitors of the present invention can be used in combination with a suitable pharmaceutical carrier.
- suitable pharmaceutical carrier can be water, glucose, ethanol, salts, buffers, glycerol, and combinations thereof.
- the composition comprises a safe and effective amount of the polypeptide or antagonist, and carriers and excipients which do not affect the effect of the drug. These compositions can be used as drugs for the treatment of diseases.
- the invention also provides a kit or kit containing one or more containers containing one or more ingredients of the pharmaceutical composition of the invention.
- a kit or kit containing one or more containers containing one or more ingredients of the pharmaceutical composition of the invention.
- these containers there may be instructional instructions given by government agencies that manufacture, use, or sell pharmaceuticals or biological products, which prompts permission for administration on the human body by government agencies that produce, use, or sell.
- the polypeptides of the invention can be used in combination with other therapeutic compounds.
- the pharmaceutical composition can be administered in a convenient manner, such as by a topical, intravenous, intraperitoneal, intramuscular, subcutaneous, intranasal or intradermal route of administration.
- Fibronectin type ⁇ 10 is administered in an amount effective to treat and / or prevent a specific indication.
- the amount and dosage range of fibronectin type II 10 administered to a patient will depend on many factors, such as the mode of administration, the health conditions of the person to be treated, and the judgment of the diagnostician. Examples
- Total human fetal brain RNA was extracted by one-step method with guanidine isothiocyanate / phenol / chloroform.
- Quik mRNA I solat ion Kit product of Qiegene was used to isolate poly (A) m 2ug poly (A) mRNA from total RNA and reverse transcription to form cDNA.
- Smart cDNA cloning kit purchased from Clontech
- the 00 fragment was inserted into the multiple cloning site of pBSK (+) vector (Clontech) to transform DH5 ⁇ , and the bacteria formed a cDNA library.
- the sequence of the fibronectin type II 10 of the present invention and the protein sequence encoded by the fibronectin type II of the present invention were profiled using the GCG profile scan program (Basic local alignment search tool) [Altschul, SF et al. J. Mol. Biol. 1990; 215: 403-10], performing domain analysis in a database such as prote.
- the fibronectin type II 10 of the present invention is homologous with a domain fibronectin type II characteristic protein at 16-87.
- the homology result is shown in FIG. 1, the homology rate is 0.05, and the score is 2.38; the threshold value is 2.23
- Example 3 Cloning of gene encoding fibronectin type II 10 by RT-PCR
- CDNA was synthesized using fetal brain total RNA as a template and oligo-dT as a primer for reverse transcription reaction. After purification with Qiagene's kit, the following primers were used for PCR amplification:
- Primer2 5-GACGGGGTCTTGCTGTCACCCAGG-3 '(SEQ ID NO: 4)
- Primerl is a forward sequence starting at lbp of the 5th end of SEQ ID NO: 1;
- Primer2 is the 3 'end reverse sequence in SEQ ID NO: 1.
- Amplification reaction conditions 50 ol / L C1, 10mmol / L Tris- HC1, pH8.5, 1.5mmol / L MgCl 2 20 ( ⁇ mol / L dNTP, lOpmol primer, 1U Taq in a 50 ⁇ 1 reaction volume DNA polymerase (Clontech).
- the reaction was performed on a PE9600 DNA thermal cycler (Perkin-Elmer) under the following conditions for 25 cycles: 94 ° C 30sec; 55 ° C 30sec; 72 ° C 2min.
- ⁇ -act in was used as the positive control and the template blank was used as the negative control.
- RNA precipitate was washed with 703 ⁇ 4 ethanol, dried and dissolved in water.
- a 32P-labeled probe (about 2 x 10 6 cpm / ml) was hybridized with a nitrocellulose membrane to which RNA was transferred at 42 ° C overnight in a solution containing 50% formamide-25raMKH 2 P0 4 ( pH7.4)-5 x SSC- 5 x Denhardt's solution and 20 ( ⁇ g / ml salmon sperm DNA. After hybridization, the filter was washed in 1 x SSC- 0.1 ° /. SDS at 55 ° C for 30 min. Then, Analysis and quantification using Phosphor Imager.
- Example 5 In vitro expression, isolation and purification of recombinant fibronectin type ⁇ 10
- Primer3 5'- CCCCATATGATGAATAGAAACTTCAGCACAGGG- 3 '(Seq ID No: 5)
- Primer4 5-CATGGATCCTCAAACAGCTGACTCTCTGCACAC-3' (Seq ID No: 6)
- the 5 'ends of these two primers contain Ndel and BamHI restriction sites, respectively.
- the coding sequences of the 5 'and 3' ends of the gene of interest are respectively followed by Ndel and BamHI restriction sites corresponding to the selective endonucleases on the expression vector plasmid pET-28b (+) (Novagen, Cat. No. 69865.3). Enzyme site.
- the pBS-1173dl0 plasmid containing the full-length target gene was used as a template for the PCR reaction.
- the PCR reaction conditions were as follows: a total volume of 50 ⁇ 1 containing 10 pg of pBS-1173dl0 plasmid, primers Primer-3 and Primer-4 were lOpmol, Advantage polymerase Mix (Clontech) 1 ⁇ 1, respectively. Cycle parameters: 94 ° C 20s, 60 ° C 30s, 68 ° C 2 min, a total of 25 cycles. Ndel and BamHI were used to double-digest the amplified product and plasmid pET-28 (+), respectively, and large fragments were recovered and ligated with T4 ligase.
- the ligated product was transformed into E. coli DH5C using the calcium chloride method. After being cultured overnight in LB plates containing kanamycin (final concentration 30 ⁇ ⁇ / ⁇ 1), positive clones were selected by colony PCR method and sequenced. A positive clone (pET-1173dl0) with the correct sequence was selected, and the recombinant plasmid was transformed into Escherichia coli BL21 (DE3) plySs (product of Novagen) by the calcium chloride method.
- the host bacteria BL21 (pET-1173dlO) was cultured at 37 ° C to the logarithmic growth phase, and IPTG was added to a final concentration of 1 to make ol / L. , Continue to cultivate for 5 hours. The bacteria were collected by centrifugation, and the supernatant was collected by centrifugation. The supernatant was collected by centrifugation. Chromatography was performed using an His. Bind Quick Cartridge (product of Novagen) which can bind to 6 histidines (6His-Tag). The purified target protein fibronectin type II 10 was obtained.
- a peptide synthesizer (product of PE company) was used to synthesize the following fibronectin type II 10-specific peptides: NH 2 -et-Asn-Arg-Asn-Phe-Ser-Thr-(; iy-I le-Glu-Ile -Arg-Hi s-Gln-Gly-C00H
- the polypeptide was coupled to hemocyanin and bovine serum albumin to form a complex, respectively.
- hemocyanin and bovine serum albumin For methods, see: Avrameas, et al. Immunochemi s try, 1969; 6: 43. Rabbits were immunized with 4 mg of the hemocyanin peptide complex plus complete Freund's adjuvant, and 15 days later, the hemocyanin peptide complex plus incomplete Freund's adjuvant was used to boost immunity once. A titer plate coated with a 15 g / ml bovine serum albumin peptide complex was used as an ELISA to determine antibody titers in rabbit serum. Protein A-Sepharose was used to isolate total IgG from antibody-positive rabbit sera.
- Suitable oligonucleotide fragments selected from the polynucleotides of the present invention are used as hybridization probes in a variety of ways.
- the probes can be used to hybridize to genomic or cDNA libraries of normal tissue or pathological tissue from different sources to It is determined whether it contains the polynucleotide sequence of the present invention and a homologous polynucleotide sequence is detected.
- the probe can be used to detect the polynucleotide sequence of the present invention or its homologous polynucleotide sequence in normal tissue or pathology. Whether the expression in tissue cells is abnormal.
- the purpose of this embodiment is to select a suitable oligonucleotide fragment from the polynucleotide SEQ ID NO: 1 of the present invention as a hybridization probe, and to identify whether some tissues contain the polynucleoside of the present invention by a filter hybridization method.
- Filter hybridization methods include dot blotting, Southern blotting, Nor thern blotting, and copying methods. They are all used to fix the polynucleotide sample to be tested on the filter and then hybridize using basically the same steps.
- the sample-immobilized filter is first pre-hybridized with a probe-free hybridization buffer, so that the non-specific binding site of the sample on the filter is saturated with the carrier and the synthetic polymer.
- the pre-hybridization solution is then replaced with a hybridization buffer containing the labeled probe and incubated to hybridize the probe to the target nucleic acid.
- the unhybridized probes are removed by a series of membrane washing steps.
- This embodiment utilizes higher-intensity washing conditions (such as lower salt concentration and higher temperature) to reduce the hybridization background and retain only strong specific signals.
- the probes used in this embodiment include two types: the first type of probes are oligonucleotide fragments that are completely the same as or complementary to the polynucleotide SEQ ID NO: 1 of the present invention; the second type of probes are partially related to the present invention
- the polynucleotide SEQ ID NO: 1 is the same or complementary oligonucleotide fragment.
- the dot blot method is used to fix the sample on the filter membrane. Under high-intensity washing conditions, the first type of probe and the sample have the strongest hybridization specificity and are retained.
- oligonucleotide fragments for use as hybridization probes from the polynucleotide SEQ ID NO: 1 of the present invention should follow the following principles and several aspects to be considered:
- the preferred range of probe size is 18-50 nucleotides
- Those that meet the above conditions can be used as primary selection probes, and then further computer sequence analysis, including the primary selection probe and its source sequence region (ie, SEQ ID NO: 1) and other known genomic sequences and their complements The regions are compared for homology. If the homology with the non-target molecular region is greater than 85% or there are more than 15 consecutive bases, the primary probe should not be used;
- Probe 1 (probel), which belongs to the first type of probe, is completely homologous or complementary to the gene fragment of SEQ ID NO: 1 (41Nt)
- Probe 2 which belongs to the second type of probe, is equivalent to the replacement mutation sequence (41Nt) of the gene fragment or its complementary fragment of SEQ ID NO: 1:
- PBS phosphate buffered saline
- step 8-13 are only used when contamination must be removed, otherwise step 14 can be performed directly.
- NC membranes nitrocellulose membranes
- the 32 P-Probe (the second peak is free ⁇ - 32 P-dATP) is prepared.
- the sample membrane was placed in a plastic bag, and 3 to 10 mg of prehybridization solution (10xDenhardt-s; 6xSSC, 0.1 mg / ml CT DM (calf thymus DM)) was added. After sealing the mouth of the bag, shake at 68 ° C for 2 hours.
- prehybridization solution 10xDenhardt-s; 6xSSC, 0.1 mg / ml CT DM (calf thymus DM)
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- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Peptides Or Proteins (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU23413/01A AU2341301A (en) | 1999-12-27 | 2000-12-25 | A novel polypeptide - type ii fibronectin 10 and a polynucleotide encoding the same |
US10/169,029 US20040038210A1 (en) | 1999-12-27 | 2000-12-25 | Novel polypeptide-type II fibronectin 10 and a polynucleotide encoding the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN99125385.X | 1999-12-27 | ||
CN99125385.XA CN1301723A (zh) | 1999-12-27 | 1999-12-27 | 一种新的多肽——纤维结合蛋白类型ii10和编码这种多肽的多核苷酸 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001048000A1 true WO2001048000A1 (fr) | 2001-07-05 |
Family
ID=5283912
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2000/000685 WO2001048000A1 (fr) | 1999-12-27 | 2000-12-25 | Nouveau polypeptide, fibronectine 10 de type ii, et polynucleotide codant pour ce polypeptide |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040038210A1 (zh) |
CN (1) | CN1301723A (zh) |
AU (1) | AU2341301A (zh) |
WO (1) | WO2001048000A1 (zh) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI392739B (zh) * | 2008-03-13 | 2013-04-11 | Academia Sinica | 用於製備纖維狀蛋白質之方法以及纖維狀蛋白質之應用 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0398859A2 (en) * | 1989-05-15 | 1990-11-22 | Washington University | Novel 92-kDa type IV collagenase |
JPH0454199A (ja) * | 1990-06-20 | 1992-02-21 | Takara Shuzo Co Ltd | 機能性ポリペプチド |
WO1994011395A1 (en) * | 1992-11-10 | 1994-05-26 | The Government Of The United States Of America, As Represented By The Secretary Of The Department Of Health And Human Services | Peptide inhibitors of fibronectin and related collagen-binding proteins |
-
1999
- 1999-12-27 CN CN99125385.XA patent/CN1301723A/zh active Pending
-
2000
- 2000-12-25 WO PCT/CN2000/000685 patent/WO2001048000A1/zh active Application Filing
- 2000-12-25 AU AU23413/01A patent/AU2341301A/en not_active Abandoned
- 2000-12-25 US US10/169,029 patent/US20040038210A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0398859A2 (en) * | 1989-05-15 | 1990-11-22 | Washington University | Novel 92-kDa type IV collagenase |
JPH0454199A (ja) * | 1990-06-20 | 1992-02-21 | Takara Shuzo Co Ltd | 機能性ポリペプチド |
WO1994011395A1 (en) * | 1992-11-10 | 1994-05-26 | The Government Of The United States Of America, As Represented By The Secretary Of The Department Of Health And Human Services | Peptide inhibitors of fibronectin and related collagen-binding proteins |
Also Published As
Publication number | Publication date |
---|---|
CN1301723A (zh) | 2001-07-04 |
AU2341301A (en) | 2001-07-09 |
US20040038210A1 (en) | 2004-02-26 |
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