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WO2001048159A1 - Nouveau polypeptide, dihydroorotase 9, et polynucleotide codant pour ce polypeptide - Google Patents

Nouveau polypeptide, dihydroorotase 9, et polynucleotide codant pour ce polypeptide Download PDF

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Publication number
WO2001048159A1
WO2001048159A1 PCT/CN2000/000702 CN0000702W WO0148159A1 WO 2001048159 A1 WO2001048159 A1 WO 2001048159A1 CN 0000702 W CN0000702 W CN 0000702W WO 0148159 A1 WO0148159 A1 WO 0148159A1
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Prior art keywords
polypeptide
dihydroorotase
polynucleotide
sequence
seq
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PCT/CN2000/000702
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English (en)
Chinese (zh)
Inventor
Yumin Mao
Yi Xie
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Shanghai Biowindow Gene Development Inc.
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Priority to AU21458/01A priority Critical patent/AU2145801A/en
Publication of WO2001048159A1 publication Critical patent/WO2001048159A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/14—Hydrolases (3)
    • C12N9/78—Hydrolases (3) acting on carbon to nitrogen bonds other than peptide bonds (3.5)
    • C12N9/86—Hydrolases (3) acting on carbon to nitrogen bonds other than peptide bonds (3.5) acting on amide bonds in cyclic amides, e.g. penicillinase (3.5.2)
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P35/00—Antineoplastic agents
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00—Drugs for immunological or allergic disorders
    • 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, dihydroorotase 9 and a polynucleotide sequence encoding the polypeptide. The invention also relates to methods and applications for preparing such polynucleotides and polypeptides.
  • Dihydroorotase also known as carbamoyl aspartate dehydratase, catalyzes the initiation of the third stage of pyrimidine biosynthesis and makes ureidosuccinic acid (N-carbamoyl-L-day Aspartic acid) is converted to dihydroorotate.
  • Dihydroorotase is one of the very few enzymes that can biosynthesize an amino bond-catalyzed reaction without directly coupling energy such as ATP, which catalyzes the cyclization of N-carbamoyl-L-aspartate This catalytic reaction also incorporates a zinc atom necessary for catalytic activity.
  • dihydroorotase In bacteria, dihydroorotase is a dimer composed of two identical long chains of about 400 amino acid residues; in higher eukaryotes, dihydroorotase is one This function is part of a large protein; in Drosophila and mammals, it catalyzes the first three steps of pyrimidine biosynthesis. Dihydroorotase is located in the center of this multiprotein. In yeast, dihydroorotase is encoded by a monofunctional protein gene (URA4). However, a dihydroorotase mutant strain was found to be encoded by the multifunctional protein gene (URA2) and catalyzes the first two steps of pyrimidine synthesis.
  • UAA4 monofunctional protein gene
  • UAA2 multifunctional protein gene
  • N-terminal conserved sequence D- [LIVMFYWSAP] -H- [LIVA]-H- [LIVF]-[RN] -x- [PGN] where two H may be sites for zinc ligands.
  • N-terminal and C-terminal conserved sequences of dihydroorotase found this time will help us to further understand the process of pyrimidine metabolism and have important significance for the prevention and control of pyrimidine metabolism diseases in organisms.
  • dihydroorotase 9 protein plays an important role in important body functions 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 involved in these processes.
  • Cheng Dihydroorotase 9 protein especially the amino acid sequence of this protein. Isolation of the new dihydroorotase 9 protein encoding gene also provides a 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 it is important to isolate its coding DNA.
  • Object of the invention is a large number of proteins are involved in these regulatory processes, there has been a need in the art to identify more involved in these processes.
  • An object of the present invention is to provide an isolated novel polypeptide, dihydroorotase 9 and fragments, analogs and derivatives thereof.
  • 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 dihydroorotase 9.
  • Another object of the present invention is to provide a method for producing dihydroorotase 9.
  • Another object of the present invention is to provide antibodies against the dihydroorotase 9 of the polypeptide of the present invention.
  • Another object of the present invention is to provide mimic compounds, antagonists, agonists, and inhibitors against the polypeptide of the present invention, dihydroorotase 9.
  • Another object of the present invention is to provide a method for diagnosing and treating diseases related to abnormalities of dihydroorotase 9. 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 1535 to 1792 in SEQ ID NO: 1; and (b) a sequence having 1-2966 in SEQ ID NO: 1 Sequence of bits.
  • the invention further relates to a vector, in particular an expression vector, containing a polynucleotide of the invention.
  • the vector genetically engineered host cell includes a transformed, transduced or transfected host cell; a method for preparing a polypeptide of the present invention comprising culturing the host cell and recovering an expression product.
  • the invention also relates to an antibody capable of specifically binding to a polypeptide of the invention.
  • the present invention also relates to a method for screening compounds that mimic, activate, antagonize or inhibit the activity of dihydroorotase 9 protein, which comprises utilizing the polypeptide of the present invention.
  • the invention also relates to compounds obtained by this method.
  • the invention also relates to a method for detecting a disease or disease susceptibility related to abnormal expression of dihydroorotase 9 protein in vitro, comprising detecting a mutation in the polypeptide or a polynucleotide sequence encoding the same in a biological sample, or The amount or biological activity of a polypeptide of the invention in a biological 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 for the preparation of a medicament for treating cancer, developmental disease or immune disease or other diseases caused by abnormal expression of dihydroorotase 9.
  • Fig. 1 is a comparison diagram of amino acid sequence homology of a total of 62 amino acids from 1-62 of dihydroorotase 9 of the present invention and characteristic sequence fragments of dihydroorotase.
  • the upper sequence is dihydroorotase 9 and the lower sequence is a characteristic sequence fragment of dihydroorotase.
  • ⁇ "and”: “and”. “Indicate that the probability of the same amino acid appearing between two sequences decreases in sequence.
  • Figure 2 shows the polyacrylamide gel electrophoresis (SDS-PAGE) of dihydroorotase 9 isolated.
  • 9kDa 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.
  • 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 the ability of natural, recombinant, or synthetic proteins and fragments thereof to induce a specific immune response and to bind specific antibodies in a suitable animal or cell.
  • An "agonist” refers to a molecule that, when combined with dihydroorotase 9 can cause the protein to change, thereby regulating the activity of the protein.
  • An agonist may include a protein, a nucleic acid, a carbohydrate or any other molecule that can bind dihydroorotase 9.
  • Antagonist refers to a molecule that, when combined with dihydroorotase 9, can block or regulate the biological or immunological activity of dihydroorotase 9.
  • Antagonists and inhibitors may include proteins, nucleic acids, carbohydrates or any other molecule that can bind dihydroorotase 9.
  • Regular refers to a change in the function of dihydroorotase 9 including an increase or decrease in protein activity, a change in binding properties, and any other biological, functional or immune change.
  • 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 dihydroorotase 9 using standard protein purification techniques.
  • Substantially pure dihydroorotase 9 produces a single main band on a non-reducing polyacrylamide gel.
  • the purity of the dihydroorotase 9 polypeptide can be analyzed by amino acid sequence.
  • Complementary or “complementary” refers to polynucleotides that naturally bind through base-pairing under conditions of acceptable salt concentration and temperature.
  • sequence CCG-A
  • GACT complementary sequence
  • the complementarity between two single-stranded molecules may 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.
  • Inhibition of such hybridization can be detected by performing hybridization (Southern or Northern 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.). The MEGALIGN program can compare two or more sequences according to different methods, such as the Clus ter method ( Higgins, DGPM Sharp (1988) Gene 73: 237-244) 0 The Cluster method arranges groups of sequences into clusters by checking the distance between all pairs. The clusters are then assigned in pairs or groups. The two amino acid sequences are The percent identity between sequence A and sequence B is calculated by the following formula: Number of residues matching between sequence ⁇ and sequence
  • the number of residues in sequence ⁇ -the number of spacer residues in sequence ⁇ -the number of spacer residues in the sequence X can also be determined by Clus ter method or using methods known in the art such as Jotun Hein (Hein J (1990) Methods in enzymology 183: 625-645).
  • 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 substitution for example, negatively charged amino acids may include aspartic acid and glutamic acid; positively charged amino acids may include lysine and arginine; having an uncharged head group is 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 DM or RNA 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 a complete antibody molecule and its fragments, such as Fa,? ( ⁇ ') 2 and? , It can specifically bind to the epitope of dihydroorotase 9.
  • Humanized antibody means that the amino acid sequence of a non-antigen-binding region has been replaced with a human antibody Antibodies that are similar but retain 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 dihydroorotase 9 means that dihydroorotase 9 is substantially free of other proteins, lipids, sugars, or other substances with which it is naturally associated. Those skilled in the art will be able to purify dihydroorotase 9 using standard protein purification techniques. Substantially pure peptides can produce a single main band on a non-reducing polyacrylamide gel. The purity of the dihydroorotase 9 polypeptide can be analyzed by amino acid sequence.
  • the present invention provides a new polypeptide, dihydroorotase 9, which basically consists 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 present invention can be naturally purified products or chemically synthesized products, or can be produced from prokaryotic or eukaryotic hosts (eg, bacteria, yeast, higher plants, insects, and mammalian cells) using recombinant techniques. 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 dihydroorotase 9.
  • fragment refers to a polypeptide that substantially maintains the same biological function or activity of the dihydroorotase 9 of the present invention.
  • the 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 replaced 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 ( ⁇ ) a type in which a group on one or more amino acid residues is replaced by another group to include a substituent; or ( ⁇ ⁇ )
  • Such a polypeptide sequence in which the mature polypeptide is fused with another compound such as a compound that prolongs the half-life of the polypeptide, such as polyethylene glycol
  • a polypeptide sequence in which an additional amino acid sequence is fused into the mature polypeptide (Such as the leader or secretory sequence or the sequence used to purify this polypeptide or protein sequence).
  • 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 the 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 with a total length of 2966 bases, and its open reading frame 1535-1792 encodes 85 amino acids.
  • This polypeptide has a characteristic sequence of dihydroorotase, and it can be inferred that the dihydroorotase 9 has the structure and function represented by the characteristic fragment of the dihydroorotase.
  • 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 a 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, 60'C; or (2) Add denaturants during hybridization, such as 50% (v / v) formamide, 0.1% calf serum / 0.1% Fi col l, 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” is at least 10 nucleotides in length, preferably at least 20-30 nucleotides, more preferably at least 50-60 Nucleotides, preferably at least 100 nucleotides. Nucleic acid fragments can also be used in nucleic acid amplification techniques such as PCR to identify and / or isolate polynucleotides encoding dihydroorotase 9.
  • 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 dihydroorotase 9 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 DNA fragment sequence of the present invention can also be obtained by the following methods: 1) isolating the double-stranded 'DM sequence from the genomic DNA; 2) chemically synthesizing the DNA sequence to obtain the double-stranded D of the polypeptide.
  • genomic DM is the least commonly used. Direct chemical synthesis of DNA sequences is often the method of choice. The more commonly used method is the isolation of cDNA sequences.
  • the standard method for isolating the cDNA of interest is to isolate mRNA from donor cells that overexpress the gene and perform reverse transcription to form a plasmid or phage cDNA library.
  • Various methods have been used to extract mRNA, and kits are also commercially available (Qiagene).
  • the construction of cDNA libraries is also a common method (Sambrook, et al., Molecular Cloning, A Laboratory Manual, Cold Spring Harbor Laboratory. New York, 1989).
  • Commercially available cDNA libraries are also available, such as different cDNA libraries from CI ontech. 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-DM or DNA-RNA hybridization; (2) the presence or loss of marker gene function; (3) determination of the level of transcript of dihydroorotase 9; ( 4) Detecting gene-expressed protein products by immunological techniques or by measuring biological activity. The above methods can be used singly 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).
  • immunological techniques such as Western blotting, radioimmunoprecipitation, and enzyme-linked immunosorbent assay (ELISA) can be used to detect the protein product expressed by the dihydroorotase 9 gene.
  • ELISA enzyme-linked immunosorbent assay
  • a method for amplifying DNA / RNA using PCR technology is preferably used to obtain the gene of the present invention.
  • the RACE method RACE-rapid amplification of cDNA ends
  • the primers can be appropriately selected based on the polynucleotide sequence information of the present invention disclosed herein, and can be synthesized by conventional methods.
  • the amplified DM / RNA fragment 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 cDM sequence.
  • the present invention also relates to a vector comprising a polynucleotide of the present invention, and a host cell produced by genetic engineering using the vector of the present invention or directly using a dihydroorotase 9 coding sequence, and the recombinant technology to produce the polypeptide of the present invention Methods.
  • a polynucleotide sequence encoding dihydroorotase 9 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 (Rosenberg, et al.
  • any plasmid and vector can be used to construct a recombinant expression vector.
  • An important feature of expression vectors is that they usually contain origins of replication, promoters, marker genes, and translational regulatory elements.
  • Methods known to those skilled in the art can be used to construct expression vectors containing a D sequence encoding dihydroorotase 9 and appropriate transcription / translation regulatory elements. These methods include in vitro recombinant DM technology, DNA synthesis technology, and in vivo recombination technology (Sambroook, et al. Molecular Cloning, a Laboratory Manual, Cold Spring Harbor Laboratory. 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: the lac or trp promoter of E.
  • the expression vector also includes a ribosome binding site and a transcription terminator for translation initiation. 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. Examples include 100 to 270 base pair SV40 enhancers on the late side of the origin of replication, and polyomas on the late side of the origin of replication Enhancers and adenovirus enhancers.
  • 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 dihydroorotase 9 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, such as a yeast cell; or a higher eukaryotic cell, such as a mammalian cell. Representative examples are: E.
  • coli Streptomyces
  • bacterial cells such as Salmonella typhimurium
  • fungal cells such as yeast
  • plant cells such as fly S2 or Sf9
  • animal cells such as CH0, COS or Bowes melanoma cells.
  • Transformation of a host cell with a DM sequence according to the present invention or a recombinant vector containing the DNA sequence can be performed by conventional techniques well known to those skilled in the art.
  • the host is a prokaryote such as E. coli
  • competent cells capable of absorbing DM may be harvested after exponential growth phase, treated with CaC l 2 method used in steps well known in the art. Alternatively, MgCl 2 is used.
  • transformation can also be performed by electroporation.
  • the host is a eukaryotic organism, the following D transfection methods can be used: calcium phosphate co-precipitation, or conventional mechanical methods such as microinjection, electroporation, and liposome packaging.
  • polynucleotide sequence of the present invention can be used to express or produce recombinant dihydroorotase 9 (Science, 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.
  • recombinant proteins can be isolated and purified by various separation methods using their 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 bacteria, Ultrasonication, 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.
  • 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.
  • Dihydroorotase catalyzes the initiation of the third stage of pyrimidine biosynthesis, converting ureidosuccinic acid (N-carbamoyl-L-aspartic acid) to dihydroorotate.
  • Dihydroorotase is one of the very few enzymes that can biosynthesize an amino bond-catalyzed reaction without directly coupling energy such as ATP.
  • the biosynthesis of pyrimidine is necessary for the production of nucleotides.
  • Dihydroorotase-specific conserved sequences are required to form its active mot if.
  • the abnormal expression of the specific dihydroorotase mot if will cause the function of the polypeptide containing the mot if of the present invention to be abnormal, which will lead to the abnormality of nucleotide biosynthesis and further affect the regulation and control of genetic information.
  • Expression, and produce related diseases such as tumors, embryonic developmental disorders, growth and development disorders, inflammation, etc.
  • abnormal expression of the dihydroorotase 9 of the present invention will produce various diseases, especially tumors, embryonic developmental disorders, growth and development disorders, and inflammations. These diseases include, but are not limited to:
  • 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
  • Growth and development disorders mental retardation, cerebral palsy, brain development disorders, mental retardation, familial cerebral nucleus dysplasia syndrome, strabismus, skin, fat and muscular dysplasia such as congenital skin laxity, premature aging Disease, congenital keratosis, various metabolic defects such as various amino acid metabolic defects, stunting, dwarfism, sexual retardation
  • 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, melanoma, 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 sinus tumor, nose Pharyngeal cancer, Laryngeal cancer, Tracheal tumor, Fibroma, Fibrosarcoma, Lipoma, Liposarcoma, Leiomyoma
  • Inflammation allergic reaction, bronchial asthma, allergic pneumonia, adult respiratory distress syndrome, sarcoidosis, rheumatoid arthritis, rheumatoid arthritis, osteoarthritis, cholecystitis, glomerulonephritis, immune complex Types of glomerulonephritis, acute anterior uveitis, dermatomyositis, urticaria, atopic dermatitis, blood color Serotonosis, polymyositis, Addison's disease, chronic active hepatitis, intestinal emergency syndrome, atrophic gastritis, systemic lupus erythematosus, myasthenia gravis, cerebral spinal cord multiple sclerosis, Guillain-Barre syndrome , Intracranial granuloma, pancreatitis, myocarditis, and inflammation caused by infections and trauma
  • the abnormal expression of the dihydroorotase 9 of the present invention will also produce certain hereditary, hematological and immune system diseases.
  • 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 tumors, embryonic development disorders, growth and development disorders, inflammation, certain heredity, blood Sexually transmitted diseases and immune system diseases.
  • the invention also provides methods for screening compounds to identify agents that increase (agonist) or suppress (antagonist) dihydroorotase 9.
  • Agonists increase the biological functions of dihydroorotase 9 to stimulate cell proliferation, while antagonists prevent and treat disorders related to excessive cell proliferation, such as various cancers.
  • mammalian cells or a membrane preparation expressing dihydroorotase 9 can be cultured with labeled dihydroorotase 9 in the presence of a drug. The ability of the drug to increase or block this interaction is then determined.
  • Antagonists of dihydroorotase 9 include antibodies, compounds, receptor deletions, and the like that have been screened.
  • An antagonist of dihydroorotase 9 can bind to dihydroorotase 9 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 exert its biology Features.
  • dihydroorotase 9 When screening compounds as antagonists, dihydroorotase 9 can be added to the bioanalytical assay to determine whether the compound is a compound by measuring the effect of the compound on the interaction between dihydroorotase 9 and its receptor. Antagonist. 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 dihydroorotase 9 can be obtained by screening a random peptide library composed of various possible combinations of amino acids bound to a solid phase. In screening, the dihydroorotase 9 molecule should generally be labeled.
  • the present invention provides a method for producing antibodies using polypeptides, and fragments, derivatives, analogs or cells thereof as antigens. These antibodies can be polyclonal or monoclonal antibodies.
  • the invention also provides antibodies against the dihydroorotase 9 epitope. These antibodies include (but are not limited to): polyclonal antibodies, monoclonal antibodies, chimeric antibodies, single chain antibodies, Fab fragments, and fragments generated from Fab expression libraries.
  • Polyclonal antibodies can be produced by injecting dihydroorotase 9 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 Agent.
  • Techniques for preparing monoclonal antibodies against dihydroorotase 9 include, but are not limited to, hybridoma technology (Koh ler and Miste in. Nature, 1975, 256: 495-497), triple tumor technology, human beta-cell hybridization Tumor technique Surgery, 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 (US Pat. No. 4946778) can also be used to produce single chain antibodies against dihydroorotase 9.
  • Antibodies against dihydroorotase 9 can be used in immunohistochemical techniques to detect dihydroorotase 9 in biopsy specimens.
  • Monoclonal antibodies that bind to dihydroorotase 9 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.
  • dihydroorotase 9 high affinity monoclonal antibodies can covalently bind to bacterial or plant toxins (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 dihydroorotase 9 positive cell.
  • the antibodies of the present invention can be used to treat or prevent diseases related to dihydroorotase 9.
  • Administration of an appropriate dose of antibody can stimulate or block the production or activity of dihydroorotase 9.
  • the invention also relates to a diagnostic test method for quantitative and localized detection of dihydroorotase 9 levels.
  • tests are well known in the art and include FI SH assays and radioimmunoassays.
  • the level of dihydroorotase 9 detected in the test can be used to explain the importance of dihydroorotase 9 in various diseases and to diagnose diseases in which dihydroorotase 9 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.
  • the polynucleotide encoding dihydroorotase 9 can also be used for a variety of therapeutic purposes.
  • Gene therapy technology can be used to treat abnormal cell proliferation, development or metabolism caused by the non-expression or abnormal / inactive expression of dihydroorotase-9.
  • Recombinant gene therapy vectors (such as viral vectors) can be designed to express mutated dihydroorotase 9 to inhibit endogenous dihydroorotase 9 activity.
  • a variant dihydroorotase 9 may be a shortened dihydroorotase 9 lacking a signaling domain, and although it can bind to a downstream substrate, it lacks signaling activity.
  • the recombinant gene therapy vector can be used to treat diseases caused by abnormal expression or activity of dihydroorotase-9.
  • Virus-derived expression vectors such as retrovirus, adenovirus, adenovirus-associated virus, herpes simplex virus, parvovirus and the like can be used to transfer a polynucleotide encoding dihydroorotase 9 into a cell.
  • Methods for constructing recombinant viral vectors carrying a polynucleotide encoding dihydroorotase 9 can be found in existing literature (Sambrook, etal.). Another reorganization Polynucleotides encoding dihydroorotase 9 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 R and DNA
  • ribozymes that inhibit dihydroorotase 9 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 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 techniques, such as solid-phase phosphate amide chemical synthesis to synthesize oligonucleotides.
  • Antisense R 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 RNA polymerase promoter of the vector.
  • it can be modified in a variety of ways, such as increasing the sequence length on both sides, and the phosphorothioate or peptide bond instead of the phosphodiester bond is used for the ribonucleoside linkage.
  • the polynucleotide encoding dihydroorotase 9 can be used for the diagnosis of diseases related to dihydroorotase 9.
  • a polynucleotide encoding dihydroorotase 9 can be used to detect the expression of dihydroorotase 9 or the abnormal expression of dihydroorotase 9 in a disease state.
  • the D sequence encoding dihydroorotase 9 can be used to hybridize biopsy specimens to determine the expression of dihydroorotase 9.
  • Hybridization techniques include Southern blotting, Nor thern blotting, and in situ hybridization. These technical methods are all mature technologies that are publicly available, and related kits are commercially available.
  • Part or all of the polynucleotides of the present invention can be used as probes to be fixed on a microarray (Microray) or a DNA chip (also known as a "gene chip") for analyzing differential expression analysis and gene diagnosis of genes in tissues .
  • Dihydroorotase 9 specific primers can also be used for RNA-polymerase chain reaction (RT-PCR) in vitro amplification to detect the dihydroorotase 9 transcript.
  • Detecting mutations in the dihydroorotase 9 gene can also be used to diagnose dihydroorotase 9-related diseases.
  • Dihydroorotase 9 mutations include point mutations, translocations, deletions, recombinations, and any other abnormalities compared to the normal wild-type dihydroorotase 9 DNA sequence. Mutations can be detected using existing techniques such as Sou thern blotting, DM sequence analysis, PCR and in situ hybridization. In addition, mutations may affect protein expression. Therefore, Nor thern blotting and Western blotting can be used to indirectly determine whether a gene is mutated.
  • 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 labeling 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. In short, the PCR primers (preferably 15-35bp) are prepared based on cDNA, and the sequence can be located on the chromosome. These primers were then used for PCR screening of somatic hybrid cells containing individual human chromosomes. Only those hybrid cells that contain 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 cDM clones with metaphase chromosomes allows precise chromosomal localization in one step.
  • FISH Fluorescent in situ hybridization
  • the difference in cDNA or genomic sequence between the affected and unaffected individuals needs 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 chromosomes, such as deletions or translocations that are visible at the chromosomal level or detectable with cDNA sequence-based PCR. According to the resolution capabilities of current physical mapping and gene mapping technology, the cDNA accurately mapped to the chromosomal region associated with the disease can be one of 50 to 500 potentially pathogenic genes (assuming 1 megabase mapping resolution) Capacity and each 20kb corresponds to a gene).
  • 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 present invention also provides a kit or kit containing one or more containers containing one or more ingredients of the pharmaceutical composition of the present invention.
  • these containers there may be instructional instructions given by government agencies that manufacture, use, or sell pharmaceuticals or biological products, which reminders authorize them to be administered to humans by government agencies that manufacture, use, or sell them.
  • 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.
  • Dihydroorotase 9 is administered in an amount effective to treat and / or prevent a specific indication.
  • the amount and dose range of dihydroorotase 9 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
  • RNA Human fetal brain total RNA was extracted by one-step method with guanidine isothiocyanate / phenol / chloroform.
  • Poly (A) mRNA was isolated from total RNA using Quik mRNA Isolation Kit (product of Qiegene). 2ug poly (A) mRNA is reverse transcribed to form cDNA.
  • the Smart cDNA cloning kit purchased from Clontech was used to insert the cDNA fragment into the multiple cloning site of the pBSK (+) vector (Clontech) to transform DH5 ⁇ .
  • the bacteria formed a cD library.
  • Dye terminate cycle reaction ion sequencing kit Perkin-Elmer
  • ABI 377 automatic sequencer Perkin-Elmer
  • the determined cDNA sequence was compared with the existing public D sequence database (Genebank), and it was found that the cDM sequence of one of the clones 0474D01 was new DNA.
  • the inserted cDNA fragments contained in this clone were determined in both directions by synthesizing a series of primers.
  • the sequence of the dihydroorotase 9 of the present invention and the protein sequence encoded by the dihydroorotidase 9 of the present invention were analyzed using the prof i le scan program (Basic local al ignment search tool) in GCG [Al tschul, SF et a l. J. ol Biol. 1990; 215: 403-10], domain analysis was performed in a database such as Prote.
  • the dihydroorotase 9 of the present invention has homology with the characteristic sequence fragment of the domain dihydroorotase in 1-62, and the homology result is shown in FIG. 1.
  • the homology rate is 0.17, and the score is 7 67;
  • the threshold is 7.62.
  • CD was synthesized by reverse transcription reaction using fetal brain cell total RNA as a template and oligo-dT as a primer. After purification using Qiagene's kit, PCR was performed using the following primers:
  • Primerl 5'- GGCGCGAGGCGCGAGCGGCTTCTC -3 '(SEQ ID NO: 3)
  • Primer2 5-TACACAAGCATTTATTTGATTTGT -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 conditions 50 ⁇ l reaction volume containing 50 ⁇ l / L KCl, 10 mmol / L Tris- HC1, pH 8.5, 1.5ramol / L MgCl 2 , 200 mol / L dNTP, lOpmol primer, 1U Taq 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.
  • RT-PCR set ⁇ -act in as a positive control and template blank as a negative control.
  • the amplified product was purified using a QIAGEN kit and ligated to a PCR vector (Invitrogen product) using a TA cloning kit.
  • the DNA sequence analysis results showed that the DNA sequence of the PCR product was exactly the same as 1-2966bp shown in SEQ ID NO: 1.
  • Example 4 Northern blot analysis of dihydroorotase 9 gene expression
  • a 32P-labeled probe (about 2 x 10 6 cpm / ml) was hybridized with a nitrocellulose membrane to which RM was transferred at 42 ° C overnight in a solution containing 50% formamide-25mM KH 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 minutes. Then Phosphor Imager was used for analysis and quantification.
  • Example 5 In vitro expression, isolation and purification of recombinant dihydroorotase 9
  • PCR was performed using the PBS-0474D01 plasmid containing the full-length target gene as a template.
  • the PCR reaction conditions are as follows: a total volume of 50 ⁇ 1 contains 10 pg of pBS-0474D01 plasmid, primers? 1 ⁇ 0161-3 and? 1 * 111161 "-4 are 10 11101, Advantage polymerase Mix (Clontech) 1 ⁇ 1. Cycle parameters: 94 ° C 20s, 60 ° C 30s, 68. C 2 min, a total of 25 cycles.
  • the amplified product and plasmid pET-28 (+) were double-digested, and large fragments were recovered, respectively, and ligated with T4 ligase.
  • the ligation product was transformed by the calcium chloride method of coliform bacteria DH5 C.
  • the LB plate with a concentration of 30 ⁇ 8 / ⁇ 1) was cultured overnight, and the positive clones were screened by colony PCR and sequenced.
  • the positive clones (PET-0474D01) with the correct sequence were selected and the recombinant plasmid was transformed into E. coli BL21 (DE3) by the calcium chloride method. ) plySs (product of Novagen).
  • the host strain BL21 (pET-0474D01) was cultured at 37 ° C to the logarithmic growth phase, and IPTG was added. Cultivate for 5 hours to a final concentration of 1 ol / L. Collect the cells by centrifugation, break the bacteria by ultrasonication, collect the supernatant by centrifugation, and use affinity chromatography that can bind 6 histidines (6His-Tag). Column His s. Bind Quick Car tr idge (product of Novagen) Chromatography was performed to obtain the purified protein dihydroorotase 9.
  • a peptide synthesizer (product of PE company) was used to synthesize the following specific peptides of dihydroorotase 9:
  • the polypeptide is coupled to hemocyanin and bovine serum albumin to form a complex, respectively.
  • hemocyanin and bovine serum albumin For methods, see: Avrameas, et al. Immunochemi stry, 1969; 6: 43. Rabbits were immunized with 4 mg of the hemocyanin polypeptide complex plus complete Freund's adjuvant, and 15 days later, the hemocyanin polypeptide 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.
  • Total IgG was isolated from antibody-positive rabbit serum using protein A-Sepharose.
  • the peptide was bound to a cyanogen bromide-activated Sepharose4B column, and anti-peptide antibodies were separated from the total IgG by affinity chromatography.
  • the immunoprecipitation method proved that the purified antibody could specifically bind to dihydroorotase-9.
  • Example 7 Application of the polynucleotide fragment of the present invention as a hybridization probe
  • 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 imprinting, Northern blotting, and copying methods. They all use the same steps to immobilize the polynucleotide sample to be tested on the filter.
  • the sample-immobilized filter is first pre-hybridized with a probe-free hybridization buffer to saturate the non-specific binding site of the sample on the filter with the carrier and the synthesized polymer.
  • the pre-hybridization solution is then replaced with a hybridization buffer containing labeled probes and incubated to hybridize the probes to the target nucleic acid.
  • the unhybridized probes are removed by a series of membrane washing steps.
  • This embodiment uses 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 the high-intensity washing conditions, the first type of probe and the sample have the strongest hybridization specificity and are retained.
  • oligonucleotide fragments from the polynucleotide SEQ ID NO: 1 of the present invention for use as hybridization probes should follow the following principles and several aspects to be considered:
  • the preferred range of probe size is 18-50 nucleotides
  • the GC content is 30% -70%, and the non-specific hybridization increases when it exceeds;
  • 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 mutant sequence of the gene fragment of SEQ ID NO: 1 or its complementary fragment (41Nt):
  • PBS phosphate buffered saline
  • DNA purification and ethanol precipitation Steps 1) Add 1/10 volume of 2mol / L sodium acetate and 2 volumes of cold 100% ethanol to the DNA solution and mix. Leave at -20 ° C for 1 hour or overnight. 2) Centrifuge for 10 minutes. 3) Carefully aspirate or pour out the ethanol. 4) Wash the pellet with 500ul of 70% cold ethanol and centrifuge for 5 minutes. 5) Carefully aspirate or pour out the ethanol. Wash the pellet with 500ul of cold ethanol and centrifuge for 5 minutes. 6) Carefully aspirate or pour out the ethanol, then invert on the absorbent paper to drain off the residual ethanol. Air dry for 10-15 minutes to allow the surface ethanol to evaporate.
  • step 8-13 are only used when contamination must be removed, otherwise step 14 can be performed directly.
  • NC membranes nitrocellulose membranes
  • Two NC membranes are required for each probe, so that they can be used in the following experimental steps.
  • the film was washed with high-strength conditions and strength conditions, respectively.
  • the 32 P-Probe (the second peak is free ⁇ 32 P-dATP) is prepared.
  • the sample membrane was placed in a plastic bag, and 3-10 mg of prehybridization solution (lOxDenhardfs; 6xSSC, 0.1 mg / ml CT DNA (calf thymus DNA)) was added. After sealing the mouth of the bag, shake at 68 ° C for 2 hours.
  • prehybridization solution lOxDenhardfs; 6xSSC, 0.1 mg / ml CT DNA (calf thymus DNA)

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Abstract

L'invention concerne un nouveau polypeptide, une dihydroorotase 9, et un polynucléotide codant pour ce polypeptide ainsi qu'un procédé d'obtention de ce polypeptide par des techniques recombinantes d'ADN. L'invention concerne en outre les applications de ce polypeptide dans le traitement de maladies, notamment des tumeurs malignes, de l'hémopathie, de l'infection par VIH, de maladies immunitaires et de diverses inflammations. L'invention concerne aussi l'antagoniste agissant contre le polypeptide et son action thérapeutique ainsi que les applications de ce polynucléotide codant pour la dihydroorotase 9.
PCT/CN2000/000702 1999-12-27 2000-12-25 Nouveau polypeptide, dihydroorotase 9, et polynucleotide codant pour ce polypeptide WO2001048159A1 (fr)

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CN99125387A CN1301827A (zh) 1999-12-27 1999-12-27 一种新的多肽——二氢乳清酸酶9和编码这种多肽的多核苷酸

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Publication number Priority date Publication date Assignee Title
WO2007010623A1 (fr) * 2005-07-22 2007-01-25 Phg Corporation Nouveau polypeptide et procédé servant à produire celui-ci

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
NAGAI H. ET AL.: "Isolation of notI clusters hypomethylated in HBV-integrated hepatocellular carcinomas by two-dimensional electrophoresis", DNA RES., vol. 6, no. 4, 1999, pages 219 - 225 *
THORAVAL D. ET AL.: "Demethylation of repetitive DNA sequences in neuroblasstoma", GENES CHROMOSOMES CANCER, vol. 17, no. 4, 1996, pages 234 - 244 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007010623A1 (fr) * 2005-07-22 2007-01-25 Phg Corporation Nouveau polypeptide et procédé servant à produire celui-ci

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