WO2001083779A1 - A novel polypeptide, a human myb protein 14 and the polynucleotide encoding the polypeptide - Google Patents

Abstract

The present invention discloses a novel polypeptide, a human myb protein 14, the polynucleotide encoding the polypeptide and the method for producing the polypeptide by DNA recombinant technology. The invention also discloses the uses of the polypeptide in methods for treating various diseases, such as malignant tumour, hemopathy, HIV infection, immunological disease, and various inflammation, etc. The invention also discloses the agonists against the polypeptide and the therapeutic action thereof. The invention also discloses the uses of the polynucleotide encoding the human myb protein 14.

Description

 A new polypeptide-human mvb protein 14 and a polynucleotide encoding the polypeptide TECHNICAL FIELD

 The present invention belongs to the field of biotechnology. Specifically, the present invention describes a new polypeptide, a human myb protein 14 and a polynucleotide sequence encoding the polypeptide. The invention also relates to a preparation method and application of the polynucleotide and the polypeptide. technical background

 The growth, differentiation, and proliferation of cells constitute an important part of the cell's life history. Problems in any of these sections will cause changes in the cell's survival status, which will affect the health of the entire body. Therefore, genes that play a regulatory role in any of these links are particularly important. The myb gene plays a regulatory role in cell growth, differentiation, and death, and is a very important gene.

 The myb gene was the first oncogene v-myb found in chickens, and its corresponding gene in normal cells was c-myb. Later, several new myb genes were discovered, A-myb and B-myb. They all contain three similar structures: an N-terminal DNA-binding region, a centrally active transcriptional structure, and a C-terminal para-regulatory region. Structures similar to the myb gene are found in many organisms, such as plants, yeast, and mold. The myb gene is generally expressed higher in proliferating cells. The myb gene is turned off in the end of differentiation and in cells that exit the cell cycle. B-myb is expressed in the whole process from implantation to maturation of fertilized eggs, while C-myb is highly expressed in hematopoietic organs, smooth muscles and rectal mucosa. A-myb is widely expressed in the actively dividing tissues during embryonic development. But after birth, it is expressed only in lymph and reproductive tissues.

 The myb gene also plays an important role in the regulation of cell differentiation. C-Myb is negatively regulated during hematopoietic cell differentiation and maturation. If c-Myb is overexpressed, it is inhibited during the differentiation of immature bone marrow and red blood cell lines. A possible mechanism for c-Myb to regulate cell differentiation is: c-Myb regulates a complex gene group, and this gene group then plays an important regulatory role in cell differentiation. In addition to its role in cell proliferation and differentiation, Myb protein is also a regulator of survival and death of bone marrow cells and T cells during development. Studies have found that turning off Myb-E t s fusion protein in chicken myeloblasts can lead to cell death. Overexpression of c-Myb protein can protect CTLL-2 T cells from dying due to interleukins, which indicates that C-Myb has an important anti-apoptotic effect in at least T cells.

Overexpression of Myb protein will cause excessive cell proliferation, inhibit cell differentiation and death, and produce tumors such as lymphoma and leukemia. Overexpression of c-Myb in hematopoietic cells of the liver can lead to liver cancer. In addition, the absence of Myb or a low expression level will lead to a decrease in the rate of cell proliferation and a variety of developmental disorders. Disease, but also cause cells to reduce their ability to buffer from external influences.

 Gene chip analysis revealed that in the thymus, testis, muscle, spleen, lung, skin, thyroid, liver, PMA + Ecv304 cell line, PMA-Ecv304 cell line, non-starved L02 cell line, arsenic-stimulated L02 L02 cell line stimulated by arsenic for 6 hours prostate, heart, lung cancer, fetal bladder, fetal small intestine, fetal large intestine, fetal thymus, fetal muscle, fetal liver, fetal kidney, fetal spleen, fetal brain, fetal lung, and fetal heart The expression profile of the polypeptide of the present invention is very similar to the expression profile of human myb protein 9, so their functions may also be similar. The invention is named human myb protein 14.

 As mentioned above, the human myb protein 14 protein plays an important role in regulating important functions of the body such as cell division and embryonic development, and it is believed that a large number of proteins are involved in these regulatory processes, so there has been a need in the art to identify more people involved in these processes. myb protein 14 protein, especially the amino acid sequence of this protein. Isolation of the newcomer myb protein 14 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 for DM. Object of the invention

 It is an object of the present invention to provide isolated new polypeptides-human myb protein 14 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 human myb protein 14. '

 Another object of the invention is to provide a genetically engineered host cell containing a polynucleotide encoding human myb protein 14.

 Another object of the present invention is to provide a method for producing human myb protein 14.

 Another object of the present invention is to provide an antibody against the polypeptide of the present invention-human myb protein 14. Another object of the present invention is to provide mimic compounds, antagonists, agonists, and inhibitors directed to the human myb protein 14 of the polypeptide of the present invention.

 Another object of the present invention is to provide a method for diagnosing and treating a disease associated with a human myb protein 14 abnormality. 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. Preferably, the 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:

 (a) a polynucleotide encoding a polypeptide having the amino acid sequence of SEQ ID No. 2;

 (b) a polynucleotide complementary to polynucleotide (a);

 (c) A polynucleotide having at least 7 o% identity to a polynucleotide sequence of ω or (b).

 More preferably, the sequence of the polynucleotide is one selected from: (a) a sequence having positions 1776-2147 in SEQ ID NO: 1; and (b) a sequence having 1-2739 in SEQ ID NO: 1 Sequence of bits.

 The present invention further relates to a vector, particularly an expression vector, containing the polynucleotide of the present invention; a host cell genetically engineered with the vector, including a transformed, transduced or transfected host cell; 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 human myb protein 14 protein, which comprises utilizing the polypeptide of the invention. The invention also relates to compounds obtained by this method.

 The present invention also relates to a method for in vitro detection of a disease or susceptibility to disease associated with abnormal expression of human myb protein 14 protein, which comprises detecting a mutation in the polypeptide or a polynucleotide sequence encoding the same in a biological sample, or detecting a mutation in a biological sample. The amount or biological activity of a polypeptide of the invention.

 The invention also relates to 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 human myb protein 14.

 Other aspects of the invention will be apparent to those skilled in the art from the disclosure of the techniques herein. BRIEF DESCRIPTION OF THE DRAWINGS

 The following drawings are used to illustrate specific embodiments of the present invention, but not to limit the scope of the present invention as defined by the claims.

FIG. 1 is a comparison diagram of gene chip expression profiles of human myb protein 14 and human myb protein 9 of the present invention. The upper graph is a graph of the expression profile of human myb protein 14, and the lower graph is the graph of the expression profile of human myb protein 9. Among them, 1 indicates fetal kidney, 2 indicates fetal large intestine, 3 indicates fetal small intestine, 4 indicates fetal muscle, 5 indicates fetal brain, 6 indicates fetal bladder, 7 means non-starved L02, 8 means L02 +, lhr, As ³⁺ , 9 means ECV304 PMA-, 10 means ECV304 PMA +, 11 means fetal liver, 12 means normal liver, 13 means thyroid, 14 means skin, 15 means fetal lung, 16 indicates lung, 17 indicates lung cancer, 18 indicates fetal spleen, 19 indicates spleen, 20 indicates prostate, 21 indicates fetal heart, 22 indicates heart, 23 indicates muscle, 24 indicates testis, 25 indicates fetal thymus, and 26 indicates thymus.

 Figure 2 shows the polyacrylamide gel electrophoresis (SDS-PAGE) of the isolated human myb protein 14. 14kDa is the molecular weight of the protein. The arrow indicates the isolated protein band. Summary of the Invention

 The following terms used in this specification and the claims shall have the following meanings unless specifically stated: "Nucleic acid sequence" refers to oligonucleotides, nucleotides or polynucleotides and fragments or parts thereof, and may also refer to the genome or synthetic DNA or RNA, they can be single-stranded or double-stranded, representing the sense or antisense strand. Similarly, the term "amino acid sequence" refers to an oligopeptide, peptide, polypeptide or protein sequence and fragments or portions thereof. When the "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 "variant" of a protein or polynucleotide 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 amino acid substituted has a structural or chemical property similar to the original amino acid, such as replacing 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" or "addition" 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.

 "Biological activity" refers to a protein that has the structure, regulation, or biochemical function of a natural molecule. Similarly, the term "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 human myb protein 14, 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 human myb protein 14.

"Antagonist" or "inhibitor" refers to a type that can block or modulate when bound to human myb protein 14. Molecule of biological or immunological activity of human myb protein 14. Antagonists and inhibitors may include proteins, nucleic acids, carbohydrates, or any other molecule that can bind human myb protein 14.

 "Regulation" refers to a change in the function of human myb protein 14, including an increase or decrease in protein activity, a change in binding properties, and any other biological, functional, or immune properties of human myb protein 14.

 "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 human myb protein 14 using standard protein purification techniques. Human myb protein 14 can generate a single main band on a non-reducing polyacrylamide gel. The purity of human myb protein 14 polypeptide can be analyzed by amino acid sequence.

 "Complementary" or "complementary" refers to the natural binding of polynucleotides by base-pairing under conditions of acceptable salt concentration and temperature. For example, the sequence "C-T-G-A" can be combined with the complementary sequence "G-A-C-T". 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. This inhibition of hybridization can be detected by performing hybridization (Southern imprinting or Northern blotting, etc.) under conditions of reduced stringency. Substantially homologous sequences or hybridization probes can compete and inhibit the binding of fully 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 (Hi ggins, DG and PM Sharp (1988) Gene 73: 237-244). _{0 The} Clus ter method compares each pair by checking the distance between all pairs. Group sequences are arranged in clusters. The clusters are then assigned in pairs or groups. The percent identity between two amino acid sequences such as sequence A and sequence B is calculated by the following formula:

 Sequence ^ (number of residues matching sequence S

^ Sequence of residues - the sequence of spacer residues - the sequence of residues ^X 3 intervals

 The percent identity between nucleic acid sequences 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).

"Similarity" refers to the identity of amino acid residues at corresponding positions when aligning amino acid sequences. Or the extent of conservative substitution. 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 RM sequence. "Antisense strand" refers to a nucleic acid strand that is complementary to a "sense strand."

 "Derivative" refers to HFP or a chemical modification of its nucleic acid. This chemical modification may be a substitution of a hydrogen atom with a fluorenyl, 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 human myb protein 14.

 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.

 The term "isolated" refers to the removal of a substance from its original environment (for example, its natural environment if it is naturally occurring). For example, a naturally-occurring polynucleotide or polypeptide is not isolated when it is present in a living thing, but the same polynucleotide or polypeptide is separated from some or all of the substances that coexist with it in the natural system. Such a polynucleotide may be part of a certain vector, or such a polynucleotide or polypeptide may be part of a certain composition. Since the carrier or composition is not part of its natural environment, they are still isolated.

 As used herein, "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). For example, 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 in the natural state .

 As used herein, "isolated human myb protein 14" means that human myb protein 14 is substantially free of other proteins, lipids, sugars, or other substances with which it is naturally associated. Those skilled in the art can purify human myb protein 14 using standard protein purification techniques. Substantially pure polypeptides produce a single main band on non-reducing polyacrylamide gels. The purity of the human myb protein 14 polypeptide can be analyzed by amino acid sequence.

The present invention provides a new polypeptide, human myb protein 14, 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 Can be non-glycosylated. Polypeptides of the invention may also include or exclude starting methionine residues.

 The invention also includes fragments, derivatives and analogs of human myb protein 14. As used herein, the terms "fragment", "derivative" and "analog" refer to a polypeptide that substantially retains the same biological function or activity of the human myb protein 1 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 (Π) such a type in which one or more amino acid residues are substituted with other groups to include a substituent; or (III) such One, in which the mature polypeptide is fused to another compound (such as a compound that extends the half-life of the polypeptide, such as polyethylene glycol); or (IV) such a polypeptide sequence in which the additional amino acid sequence is fused into the mature polypeptide ( Such as leader sequences or secreted sequences or sequences used to purify this polypeptide or protease sequences). As set forth herein, 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 the nucleotide sequence of SEQ ID NO: 1. The polynucleotide of the present invention is found from a CDM library of human fetal brain tissue. It contains a full-length polynucleotide sequence of 2739 bases and its open reading frame of 1776-2147 encodes 123 amino acids. According to the comparison of gene chip expression profiles, it was found that this polypeptide has a similar expression profile with human myb protein 9, and it can be deduced that the human myb protein 14 has a similar function to human myb protein 9.

 The polynucleotide of the present invention may be in the form of DM or RNA. DM 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. As used herein, 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.

 The term "polynucleotide encoding a polypeptide" refers to a polynucleotide comprising the polypeptide and a polynucleotide comprising 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. Variants of this polynucleotide may be naturally occurring allelic variants or non-naturally occurring variants. These nucleotide variants include substitution variants Body, deletion variant, and insertion variant. As is known in the art, an allelic variant is a replacement form of a polynucleotide that may be a substitution, deletion, or insertion of one or more nucleotides, but does not substantially change the polypeptide encoding Features.

 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. In the present invention, "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 the two sequences Hybridization occurs only when the identity is at least 95%, and more preferably 97%. Moreover, the polypeptide encoded by the hybridizable polynucleotide has the same biological function and activity as the mature polypeptide shown in SEQ ID NO: 2.

 The invention also relates to nucleic acid fragments that hybridize to the sequences described above. As used in the present invention, the "" nucleic acid fragment "contains at least 10 nucleotides in length, preferably at least 20-30 nucleotides, more preferably at least 50-60 nucleotides, most preferably at least 100 nucleotides. Nucleotides or more. Nucleic acid fragments can also be used in nucleic acid amplification techniques (such as PCR) to identify and / or isolate polynucleotides encoding human myb protein 14.

 The 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 human myb protein 14 of the present invention can be obtained by various methods. For example, 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 DM sequence to obtain the double-stranded DNA of the polypeptide.

 Of the methods mentioned above, genome D is the least commonly used. Direct chemical synthesis of DNA sequences is often the method of choice. The more commonly used method is the separation of cDM 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. There are many mature techniques for extracting mRM, and kits are also commercially available (Qiagene). The construction of cDNA libraries is also a common method (Sambrook, et al., Molecular Cloning, A Laboratory Manua, Cold Spring Harbor Laboratory. 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.

The genes of the present invention can be screened from these CDM libraries by conventional methods. These methods include (but are not limited to): (l) DNA-DM or DNA-RNA hybridization; ( ² ) the appearance or loss of marker gene function; (3) measurement Set the transcript level of human myb protein 14; (4) Detect the protein product of gene expression by immunological techniques or determination of biological activity. The above methods can be used singly or in combination.

 In the method (1), 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. In addition, the length of the probe is usually within 2000 nucleotides, preferably within 1000 nucleotides. The probe used herein is usually a D 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. DM probes can be labeled with radioisotopes, luciferin, or enzymes (such as alkaline phosphatase).

 'In the (4) method, immunological techniques such as Western blotting, radioimmunoprecipitation, and enzyme-linked immunosorbent assay (ELISA) can be used to detect the protein product of human myb protein 14 gene expression.

 A method (Sa iki, et al. Science 1985; 230: 1350-1354) using PCR technology to amplify DNA / RM is preferred for obtaining the gene of the present invention. In particular, when it is difficult to obtain a full-length cDNA from a library, the RACE method (RACE-Rapid Amplification of cDNA Ends) can be preferably used. 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 DM / RNA fragment can be isolated and purified by conventional methods such as by gel electrophoresis.

 The polynucleotide sequence of the gene of the present invention or various DM 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 the polynucleotide of the present invention, and a host cell produced by genetic engineering using the vector of the present invention or directly using a human myb protein 14 coding sequence, and a method for producing a polypeptide of the present invention by recombinant technology.

In the present invention, a polynucleotide sequence encoding the human myb protein 14 may be inserted into a vector to constitute a recombinant vector containing the polynucleotide of the present invention. The term "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 Nathans, J Bio Chera. 263: 3521, 1988) and baculovirus-derived vectors expressed in insect cells. In short, as long as it can be replicated and stabilized in a host, 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 well known to those skilled in the art can be used to construct expression vectors containing a DNA sequence encoding human myb protein 14 and appropriate transcriptional / translational regulatory elements. These methods include in vitro recombinant DNA technology, DNA synthesis technology, and in vivo recombination technology (Sambroook, et al. Molecular Cloning, a Laboratory Manual, Cold Spice Harbor Laboratory. New York, 1989). The DM 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. coli; the PL promoter of lambda phage; eukaryotic promoters include the CMV immediate early promoter, the HSV thymidine kinase promoter, the early and late SV40 promoters, Retroviral LTRs and other known promoters that control the expression of genes in prokaryotic or eukaryotic cells or their viruses. 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. Illustrative examples include SV40 enhancers of 100 to 270 base pairs on the late side of the origin of replication, polyoma enhancers on the late side of the origin of replication, and adenoviral enhancers.

 In addition, 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. Fluorescent protein (GFP), or tetracycline or ampicillin resistance for E. coli.

 Those of ordinary skill in the art will know how to select appropriate vector / transcription control elements (such as promoters, enhancers, etc.) and selectable marker genes.

 In the present invention, a polynucleotide encoding human myb protein 14 or a recombinant vector containing the polynucleotide can be transformed or transduced into a host cell to form 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; insect 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. When the host is a prokaryote such as E. coli, competent cells capable of absorbing DNA can be harvested after the exponential growth phase and treated with the 01 ₁₂ method, the steps used are well known in the art. Alternatively, MgCl ₂ is used. If necessary, transformation can also be performed by electroporation. When the host is a eukaryotic organism, the following DNA transfection methods can be used: calcium phosphate co-precipitation method, or conventional mechanical methods such as microinjection, electroporation, and liposome packaging.

By conventional recombinant DM technology, the polynucleotide sequence of the present invention can be used for expression or production Recombinant human myb protein 14 (Sc ience, 1984; 224: 1431). Generally there are the following steps:

(1) using the polynucleotide (or variant) encoding human myb protein 14 of the present invention, or transforming or transducing a suitable host cell with a recombinant expression vector containing the polynucleotide;

 (2) culturing host cells in a suitable medium;

 (3) Isolate and purify protein from culture medium or cells.

 In step (2), depending on the host cell used, 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.

 In step (3), 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. The polypeptides of the present invention, as well as the antagonists, agonists and inhibitors of the polypeptides, can be directly used in the treatment of diseases, for example, they can treat malignant tumors, adrenal deficiency, skin diseases, various inflammations, HIV infections and immune diseases.

 The myb gene plays a regulatory role in cell growth, differentiation, and death, and can be used to treat and prevent various developmental disorders and cancers. The polypeptide of the present invention or a fragment thereof can be used to treat or prevent diseases caused by developmental disorders, including but not limited to: spina bifida, craniocerebral fissure, anencephaly, cerebral bulge, foramen forebral malformation, Down syndrome, congenital Hydrocephalus, aqueduct malformation, dwarfism of cartilage hypoplasia, spinal epiphyseal dysplasia, pseudochondral dysplasia, Langer-Giedion syndrome, funnel chest, gonad hypoplasia, congenital adrenal hyperplasia, upper urethra, Cryptorchidism, short stature syndrome such as Conradi syndrome and Danbol t-Clos syndrome, congenital glaucoma or cataract, congenital lens position abnormality, congenital blepharoplasia, retinal dysplasia, congenital optic atrophy , Congenital Sensorineural Hearing Loss, Split Hand, Split Foot, Teratology, Williams Syndrome, Alagi Lle Syndrome, Bayer Syndrome, etc.

 The polypeptides or fragments thereof of the present invention can also be used to treat or prevent cancer. Including but not limited to: Common tumors of each system are as follows:

Respiratory System Tumors: Nasal and Sinus Tumors, Nasopharyngeal Cancer, Laryngeal Cancer, Tracheal Cancer, Lung Cancer, Pleural Mesothelioma Digestive system tumors: salivary gland tumors, esophageal cancer, esophageal leiomyosarcoma, primary esophageal small cell carcinoma, gastric cancer, gastric malignant lymphoma, gastric carcinoid, colorectal cancer, colon cancer, intestinal malignant lymphoma, primary liver cancer, Hepatoblastoma, primary gallbladder cancer, pancreatic cancer

 Blood, lymphatic tumors: acute leukemia, chronic myelogenous leukemia, chronic lymphocytic leukemia, malignant lymphoma (such as lymphatic reticulum, malignant lymphoma, Hodgkin lymphoma, non-Hodgkin lymphoma, etc.), malignant Histiocytosis

 Nervous system tumors: astrocytoma, ependymal tumor, medulloblastoma, meningiomas, glioblastoma, acoustic neuroma, angiogenic tumor, pituitary adenoma, craniopharyngioma

 Motor system tumors: osteoid osteoma, osteochondroma, chondroma, osteoblastoma, chondroblastoma, etc.), malignant bone tumors such as giant cell tumor of bone, osteosarcoma, chondrosarcoma, Ewing's sarcoma, myeloma urinary Reproductive system tumors: Benign tumors such as renal cortical tubular adenoma, eosinophil adenoma, juxtaglomerular cell tumor, polycystic kidney tumor, seminoma, teratoma, testicular stromal tumor, endometrium Interstitial tumor, hydatidiform mole, ovarian tumor, breast fibroma, malignant tumors such as renal cell carcinoma, renal sarcomatoid carcinoma, papillary renal cell carcinoma, nephroblastoma, prostate cancer, testicular tumor chorionic carcinoma, epididymal cancer, child Cervical cancer, endometrial cancer, endometrial cancer, fallopian tube cancer, ovarian malignancy, breast cancer endocrine system tumor: pituitary adenoma, benign thyroid tumor, thyroid cancer, parathyroid adenoma, parathyroid cancer, adrenal marrow Lipoma, pheochromocytoma, islet cell tumor, multiple endocrine gland tumor, thymus tumor

 Soft tissue tumors: fibroma, fibrosarcoma, fibromatosis, lipoma, liposarcoma, leiomyoma, leiomyosarcoma, rhabdomyosarcoma, rhabdomyosarcoma, synovial tissue tumor, hemangioma, intramuscular hemangioma, blood vessels Globuloma, hemangioendothelial sarcoma, lymphangioma, lymphangiomyoma, lymphatic endothelial sarcoma, histiocytoma, malignant fibrous histiocytoma, soft tissue acinar sarcoma, clear cell sarcoma, myxoma, extraosseous Ewing's sarcoma, Soft tissue osteosarcoma, soft tissue chondrosarcoma, mesothelioma, epithelioid sarcoma, schwannomas, neurofibromas, malignant schwannomas, neurofibromatosis

 Skin malignancies: dermal Mike cell tumor, Kaposi sarcoma, melanoma

 The invention also provides methods for screening compounds to identify agents that increase (agonist) or suppress (antagonist) human myb protein 14. Agonists enhance biological functions such as human myb protein 14 to stimulate cell proliferation, while antagonists prevent and treat disorders related to excessive cell proliferation, such as various cancers. For example, mammalian cells or a membrane preparation expressing human myb protein 14 can be cultured with labeled human myb protein 14 in the presence of a drug. The ability of the drug to increase or block this interaction is then determined.

Antagonists of human myb protein 14 include antibodies, compounds, receptor deletions, and analogs. An antagonist of human myb protein 14 can bind to human myb protein 14 and eliminate its function, or Inhibiting the production of the polypeptide, or binding to the active site of the polypeptide prevents the polypeptide from performing a biological function.

 When screening compounds as antagonists, human myb protein 14 can be added to a bioanalytical assay to determine whether the compound is an antagonist by measuring the effect of the compound on the interaction between human myb protein 14 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 human myb protein 14 can be obtained by screening a random peptide library composed of various possible combinations of amino acids bound to a solid phase. When screening, the human myb protein 14 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 human myb protein 14 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 human myb protein 14 directly into immunized animals (such as rabbits, mice, rats, etc.). Various adjuvants can be used to enhance the immune response, including but not limited to Freund's adjuvant. Techniques for preparing monoclonal antibodies to human myb protein 14 include, but are not limited to, hybridoma technology (Kohler and Miste in. Nature, 1975, 256: 495-497), triple tumor technology, human beta cell hybridoma technology, EBV-hybridoma technology, etc. Chimeric antibodies that combine human constant regions with non-human variable regions can be produced using existing techniques (Morrison et al, PNAS, 1985, 81: 6851) and existing techniques for producing single-chain antibodies (US Pat No. 4946778) can also be used to produce single chain antibodies against human myb protein 14.

 Anti-human myb protein 14 antibodies can be used in immunohistochemical techniques to detect human myb protein 14 in biopsy specimens.

 Monoclonal antibodies that bind to human myb protein 14 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. For example, human myb protein 14 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 human myb protein 14 positive cells.

The antibodies in the present invention can be used to treat or prevent diseases related to human myb protein 14. Administration of an appropriate dose of the antibody can stimulate or block the production or activity of human myb protein 14. The invention also relates to a diagnostic test method for quantitative and localized detection of human myb protein 14 levels. These tests are well known in the art and include FISH assays and radioimmunoassays. The level of human myb protein 14 detected in the test can be used to explain the importance of human myb protein 14 in various diseases and to diagnose diseases in which human myb protein 14 plays a role.

 The polypeptide of the present invention can also be used for peptide mapping analysis. For example, 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 human myb protein 14 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 human myb protein 14. Recombinant gene therapy vectors (such as viral vectors) can be designed to express mutated human myb protein 14 to inhibit endogenous human myb protein 14 activity. For example, a mutated human myb protein 14 may be a shortened human myb protein 14 lacking a signaling domain. Although it can bind to downstream substrates, it lacks signaling activity. Therefore, recombinant gene therapy vectors can be used to treat diseases caused by abnormal expression or activity of human myb protein 14. Virus-derived expression vectors such as retrovirus, adenovirus, adenovirus-associated virus, herpes simplex virus, and parvovirus can be used to transfer a polynucleotide encoding human myb protein 14 into cells. Methods for constructing recombinant viral vectors carrying a polynucleotide encoding human myb protein 14 can be found in the existing literature (Sambrook, et al.). In addition, a recombinant polynucleotide encoding human myb protein 14 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.

 Oligonucleotides (including antisense RNA and DM) and ribozymes that inhibit human myb protein 14 mRNA are also within the scope of the present invention. A ribozyme is an enzyme-like RM molecule that can specifically decompose specific RNA. Its mechanism is that the ribozyme molecule specifically hybridizes with a complementary target RNA and performs endonucleation. Antisense RM, DM, and ribozymes can be obtained by any existing RNA or DM synthesis technology, such as solid-phase phosphoramidite chemical synthesis to synthesize oligonucleotides. Antisense RM molecules can be obtained by in vitro or in vivo transcription of a DNA sequence encoding the RNA. This DM sequence has been integrated downstream of the RNA polymerase promoter of the vector. In order to increase the stability of the nucleic acid molecule, 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 human myb protein 14 can be used for the diagnosis of diseases related to human myb protein 14. The polynucleotide encoding human myb protein 14 can be used to detect the expression of human myb protein 14 or the abnormal expression of human myb protein 14 in a disease state. For example, the DNA sequence encoding human myb protein 14 can be used for Biopsy specimens were hybridized to determine the expression of human myb protein 14. Hybridization techniques include Southern blotting, Northern blotting, and in situ hybridization. These techniques and methods are publicly available and mature, and related kits are commercially available. Some or all of the polynucleotides of the present invention can be used as probes to be fixed on a microarray or a DNA chip (also referred to as a "gene chip") for analyzing differential expression analysis and gene diagnosis of genes in tissue. Human myb protein 14 specific primers can also be used to detect human myb protein 14 transcripts by RNA-polymerase chain reaction (RT-PCR) in vitro amplification.

 Detection of mutations in the human myb protein 14 gene can also be used to diagnose human myb protein 14-related diseases. Human myb protein 14 mutations include point mutations, translocations, deletions, recombinations, and any other abnormalities compared to the normal wild-type human myb protein 14 DNA sequence. Mutations can be detected using well-known techniques such as Southern imprinting, DNA 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.

 The 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 DM sequences on a chromosome.

 In short, PCR primers (preferably 15-35bp) are prepared according to cDM, and the sequences can be located on 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. Using the 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 (FISH) of cDNA clones with metaphase chromosomes allows precise chromosomal localization in one step. For a review of this technique, see Verma et al., Human Chromosomes: a Manua l of Basic Techniques, Pergamon Pres s, New York (1988).

Once the sequence is located at the exact chromosomal location, the physical location of the sequence on the chromosome can be correlated with the genetic map data. These data can be found in V. Mckusick, Mendel ian Inherance in Man (available online with Johns Hopkins University Welch Medical Library). Linkage analysis can then be used to determine the relationship between genes and diseases that are mapped to chromosomal regions. Next, the CDM or genomic sequence differences 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 technology, cMAs that are accurately mapped to disease-related chromosomal regions 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. These carriers can be water, glucose, ethanol, pots, 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. Along with 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. In addition, 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. Human tnyb protein 14 is administered in an amount effective to treat and / or prevent a specific indication. The amount and range of human myb protein 14 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

 The present invention is further described below with reference to specific embodiments. It should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. The experimental methods in the following examples are not marked with specific conditions, usually according to conventional conditions such as Sambrook et al., Molecular Cloning: Laboratory Manual (New York: Cold Harbor Harbor Laboratory Press, 1989), or according to the manufacturing conditions Conditions recommended by the manufacturer.

 Example 1 Cloning of human myb protein 14

Total human fetal brain RNA was extracted by one-step method with guanidine isothiocyanate / phenol / chloroform. Poly (A) mMA was isolated from total RNA using Quik mRNA Isolat ion Kit (product of Qiegene). 2ug poly (A) mRNA forms CDM by reverse transcription. The Smart cDNA cloning kit (purchased from Clontech) was used to insert the cDNA fragments into the multicloning site of pBSK (+) vector (Clontech) to transform DH5α. The bacteria formed a cDNA library. With Dye The terminate cycle react ion sequencing kit (Perkin-Elmer) and the ABI 377 automatic sequencer (Perkin-Elmer) determined the sequences at the 5 'and 3' ends of all clones. The determined cDNA sequence was compared with the existing public D sequence database (Genebank), and it was found that the cMA sequence of one of the clones 0460 _g 01 was a new MA. A series of primers were synthesized to determine the inserted cDNA fragments of the clone in both directions. The results showed that the full-length cDNA contained in the 0460g01 clone was 2739bp (as shown in Seq ID NO: 1), from 1776bp to 2i47bp there was a 371bp open reading frame (0RF), encoding a new protein (such as Seq ID NO : Shown in 2). We named this clone pBS-0460g01, and named the encoded protein as human myb protein 14. Example 2 Cloning of a gene encoding human myb protein 14 by RT-PCR

 CDNA was synthesized using fetal brain cell total RNA as a template and ol igo-dT as a primer for reverse transcription reaction. After purification with Qiagene's kit, the following primers were used for PCR amplification:

 Primerl: 5,-GTTTCTAAATCTAATGAATAGAAC-3 '(SEQ ID NO: 3)

 Primer2: 5,-GTGGTTTATCATTTTATTATTAGA-3 '(SEQ ID NO: 4)

 Primerl is a forward sequence located at the 5th end of SEQ ID NO: 1, starting at lbp;

 Primer2 is the 3, terminal reverse sequence of SEQ ID NO: 1.

Amplification reaction conditions: containing 50mmol / L KCl in a reaction volume of ₅₀ μ 1, 10mmol / L Tris-HCl pH8 5, 1. 5mmol / L MgCl 2, 20 (^ mol / L dNTP, l Opmol primer. 1U of Taq DNA polymerase (product of 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. During RT-PCR, β-act in was used as a positive control and template blank was used as a negative control. The amplified product was purified using a QIAGEN kit, and linked to a pCR vector using a TA cloning kit (Invitrogen). DM sequence The analysis results show that the DM sequence of the PCR product is exactly the same as 1-2739bp shown in SEQ ID NO: 1. Example 3 Analysis of human myb protein 14 gene expression by Northern blot

Total RM was extracted in one step [Anal. Biochem 1987, 162, 156-159]. This method involves acid guanidinium thiocyanate phenol-chloroform extraction. That is, the tissue was homogenized with 4M guanidine isothiocyanate-25mM sodium citrate, 0.2M sodium acetate (pH4.0), and 1 volume of phenol and 1/5 volume of chloroform-isoamyl alcohol (49: 1), centrifuge after mixing. Aspirate the aqueous layer, add isopropanol (0.8 vol) and centrifuge the mixture to obtain RNA precipitate. The resulting RNA pellet was washed with 70% ethanol, dried and dissolved in water. Using 20 μ _§ RNA, electrophoresis was performed on a 1.2% agarose gel containing 20 mM 3- (N-morpholino) propanesulfonic acid (H7. 0)-5 mM sodium acetate-ImM EDTA-2 · 2M formaldehyde. It was then transferred to a nitrocellulose membrane. Preparation of ³² P-labeled by random primer method with a- ³² P dATP DM probe. The DNA probe used is shown in Figure 1 PCR amplified human myb 14 protein coding sequence (1776bp to ² 147bp). The 32P- labeled probes (about 2 xl 0 ⁶ cpm / ml) and RNA was transferred to a nitrocellulose membrane overnight at 42 ° C in a hybridization solution, the solution comprising 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 min. Then Analysis and quantification using Phosphor Imager. Example 4 In vitro expression, isolation and purification of recombinant human myb protein 14

 Based on SEQ ID NO: 1 and the coding region sequence shown in Figure 1, a pair of specific amplification primers were designed, the sequence is as follows:

Primer3: 5 '-CATGCTAGCATGGCTGGAGAGGCCTCAGGAAAC- 3' (Seq ID No: 5) Primer 4: 5'-CCCGAATTCCTATGGATCCGTGTTTCCCTCTAT-3 '(Seq ID No: 6) The two ends of these two primers contain Nhel and EcoRI digestion sites, respectively. , Followed by the coding sequences of the 5 ,, and 3 'ends of the gene of interest, respectively. The Nhel and EcoRI digestion sites correspond to the expression vector plasmid pET- ² 8b (+) (Novagen, Cat. No. 69865. 3) Selective endonuclease site. The PCR reaction was performed using pBS-0460g01 plasmid containing the full-length target gene as a template. PCR reaction conditions were: 1 in a total volume of ₅₀ μ plasmid pBS-0460g01 containing 10pg, and the primers Pr imer- 4 Primer- 3 are l Opmol, Advantage polymerase Mix (Clontech Products) 1 _μ 1. Cycle parameters: 94. C 20s, 60. C 30s, 68 ° C 2 min , ²⁵ cycles total. Nhel and EcoRI were used to double digest the amplified product and plasmid pET-28 (+), respectively, and large fragments were recovered and ligated with T4 ligase. The ligation product was transformed into coliform bacteria DH5a by the calcium chloride method. After being cultured overnight in LB plates containing kanamycin (final concentration 30 μ _§ / πι1), positive clones were selected by colony PCR method and sequenced. Select positive clones with the correct sequence (pET- (M60 _g 01) and transform the recombinant plasmid into Escherichia coli BL21 (DE3) plySs (product of Novagen) using calcium chloride method. Kanamycin-containing (final concentration 30 _μβ / ηι1) of LB liquid medium, host strain BL21 _(P ET-0460g01) incubated at 37 ° C to logarithmic phase, IPTG was added to a final concentration of lmmol / L, incubation was continued for 5 hours. harvested by centrifugation, disrupted bacteria by ultrasonic The supernatant was collected by centrifugation, and the affinity chromatography column His. Bind Quick Cartr idge (Novagen) was used for chromatography. The purified target protein was human myb protein. 14. After SDS-PAGE electrophoresis, a single band was obtained at 14 kDa (Figure 2). The band was transferred to a PVDF membrane and the N-terminal amino acid sequence was analyzed by Edams hydrolysis method. As a result, 15 amino acids at the N-terminus were obtained. It is completely the same as the N-terminal 15 amino acid residues shown in SEQ ID NO: 2. Example 5 Production of anti-human myb protein 14 antibody

The following peptides specific for human rayb protein 14 were synthesized by a peptide synthesizer (product of PE company): NH2-Met-Ala-Gly-Glu-Ala-Ser-Gly-Asn-Leu-Thr-I le-Met-Ala-Glu-Gly-C00H (SEQ ID NO: 7). The polypeptide is coupled to hemocyanin and bovine serum albumin to form a complex, respectively. For methods, see: Avrameas, et al. Immunochemi stry, 1969; 6: 43. Rabbits were immunized with ½ g of the i-cyanin peptide 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 Sepha _r0 se4B column, and the anti-peptide antibody was separated from the total IgG by affinity chromatography. The immunoprecipitation method proved that the purified antibody could specifically bind to human myb protein 14. Example 6 Application of the polynucleotide fragment of the present invention as a hybridization probe

 The suitable oligonucleotide fragments selected from the polynucleotides of the present invention are used as hybridization probes in various aspects. For example, the probes can be used to hybridize to the genome or CDM library 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. Further, 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 using a filter hybridization method. Acid sequence or a homologous polynucleotide sequence thereof. 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. These same steps are as follows: 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. After the hybridization step, 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), so that the hybridization background is reduced and only strong specific signals are retained. 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. In this example, 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.

 First, the selection of the probe

The oligonucleotide fragment selected from the polynucleotide SEQ ID NO: 1 of the present invention for use as a hybridization probe shall be Following the following principles and several aspects to consider:

 1. The preferred range of probe size is 18-50 nucleotides;

 2, GC content is 30% -70%, non-specific hybridization increases when it exceeds;

 3. There should be no complementary regions inside the probe;

 4. 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 unknown genomic sequences and their complements For homology comparison of the regions, 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 generally;

 5. Whether the preliminary selection probe is finally selected as a probe with practical application value should be further determined by experiments.

 After completing the above analysis, select and synthesize the following two probes:

 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):

5'-TGGCTGGAGAGGGGTCTCAGGAAACTTAACGATCATGGCGGAA-3 '(SEQ ID NO: 8) Probe 2 (probe ² ), which belongs to the second type of probe, is equivalent to the replacement mutation sequence (fiber) of the gene fragment or its complementary fragment of SEQ ID NO: 1 :

 5'-TGGCTGGAGAGGGGTCTCAGGACACTTAACGATCATGGCGGAA-3 '(SEQ ID NO: 9) For other commonly used reagents and their preparation methods not related to the following specific experimental steps, please refer to the literature: DNA PROBES GH Kel ler; MM Manak; Stockton Press, 1989 ( USA) and more commonly used molecular cloning experiment manual books such as "Molecular Cloning Experiment Guide" (Second Edition 1998) [US] Sambrook et al., Science Press.

 Sample Preparation:

 1.Extract DM from fresh or frozen tissue

Steps: 1) Place fresh or freshly thawed normal liver tissue in a plate immersed in ice and filled with phosphate buffered saline (PBS). Cut the tissue into small pieces with scissors or a scalpel. Keep tissue moist during operation. 2) Centrifuge the tissue at 1000g for 10 minutes. 3) Suspend the precipitate (about 10 ml / g) with cold homogenization buffer (0.25 mol / L sucrose; 25 mmol / L Tris-HCl, pH 7.5; 25 mmol / L NaCl; 25 mmol / L MgCl ₂ ). 4) Homogenize the tissue suspension at ⁴ ° C at full speed with an electric homogenizer until the tissue is completely broken. 5) Centrifuge at 1000g for 10 minutes. 6) Resuspend the cell pellet (1 to 5 ml per 0.1 g of the original tissue sample), and centrifuge at 1000 g for 10 minutes. > 7) Resuspend the pellet with lysis buffer (add 1 ml per 0.1 g of the initial tissue sample), and then follow the phenol extraction method below. 2, phenol extraction method for DNA

Steps: 1) Wash cells with 10 ml of cold PBS and centrifuge at 1,000 g for 10 minutes. 2) Resuspend the pelleted cells with cold cell lysate (1x10 ⁸ cells / ml). Use a minimum of 100ul lysis buffer. 3) Add SDS to a final concentration of 1%. If SDS is added directly to the cell pellet before resuspending the cells, the cells may form large clumps that are difficult to break, and reduce the overall yield. This is particularly serious when extracting> 10 ⁷ cells. 4) Add proteinase K to a final concentration of 200ug / ml. 5) Incubate at 50 ° C for 1 hour or at 37 ° C. C gently shake overnight. 6) Extract with an equal volume of phenol: chloroform: isoamyl alcohol (25: 24: 1) and centrifuge in a small centrifuge tube for 10 minutes. The two should be clearly separated, otherwise centrifuge again. 7) Transfer the water phase to a new tube. 8) Extract with an equal volume of chloroform: isoamyl alcohol (24: 1) and centrifuge for 10 minutes. 9) Transfer the DNA-containing aqueous phase to a new tube. The DNA was then purified and ethanol precipitated.

 3, 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. At -20. C Let stand 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. Be careful not to allow the pellet to dry completely, otherwise it will be more difficult to re-dissolve. 7) Resuspend the DNA pellet in a small volume of TE or water. Low-speed vortexing or pipetting, with a dropper, while gradually increasing the TB, DNA mixed until fully dissolved, ^1- 5χ 10 ό each extracted cell plus about lul.

 The following steps 8-13 are only used when contamination must be removed, otherwise step 14 can be performed directly.

8) Add RNase A to D solution to a final concentration of 100ug / ml, and incubate at 37 ° C for 30 minutes. 9) Add SDS and proteinase K to the final concentration of 0.5% and 100ug / ml. Incubate at 37 ° C for 30 minutes. 10) Extract the reaction solution with an equal volume of phenol: chloroform: isoamyl alcohol (25: 24: 1) and centrifuge for 10 minutes. 11) Carefully remove the aqueous phase and re-extract with an equal volume of chloroform: isoamyl alcohol (24: 1) and centrifuge for 10 minutes. 12) Carefully remove the water phase, add 1/10 volume of 2mol / L sodium acetate and 2.5 volumes of cold ethanol, mix and let stand at -20 ^Q C for 1 hour. I ³ ) Wash the precipitate with 70% ethanol and 100% ethanol, air dry, and resuspend the nucleic acid, the process is the same as steps 3-6. 14) Determine A ₂₆ . And A _28D to detect the purity and yield of DNA. 15) Store at -20 ° C after dispensing.

 Preparation of sample film:

 1) Take 4x2 pieces of nitrocellulose membranes (NC membranes) of appropriate size, and mark the spotting position and sample number on it with a pencil. 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.

2) Pipette and control 15 μl each, spot on the sample film, and dry at room temperature. 3) Place on filter paper infiltrated with 0.1 lraol / L NaOH, 1.5mol / L NaCl for 5 minutes (twice), dry and place in 0.5mol / L Tris-HCl (H7.0), 3raol / L NaCl filter paper for 5 minutes (twice) and allowed to dry.

 4) Clamped in clean filter paper, wrapped with aluminum foil, and dried under vacuum for 60-80 for 2 hours.

 Labeling of probes

1) 3μ1 Probe (0: IOD / Ιθμΐ), add 2μ1 Kinase buffer, 8-10 uCi γ- ³² P-dATP + 2U Kinase, to make up to a final volume of 20μ1.

 2) Incubate at 37 ° C for 2 hours.

 3) Add 1/5 volume of Bromophenol Blue Indicator (BPB).

 4) Pass Sephadex G-50 column.

5) Before the ³² P-Probe is washed out, start collecting the first peak (can be monitored by Monitor).

 6) 5 drops / tube, collect 10-15 tubes.

 7) Monitor the amount of isotope with a liquid scintillator

8) combining the first peak was collected after ³² P-Prob _e is prepared as required (the second peak to the free γ- ³² Ρ - dATP).

 Pre-hybridization

 The sample membrane was placed in a plastic bag, and 3-1 Omg pre-hybridization solution (lOxDenhardt's; 6xSSC, 0.1 mg / ml CT DM (calf thymus DNA)) was added. After closing the bag, 68. C water bath for 2 hours.

 Cross

 Cut a corner of the plastic bag, add the prepared probe, seal the bag, and shake it at 42 ° C in a water bath overnight. Wash film:

 High-intensity washing film:

 1) Take out the hybridized sample membrane.

 2) 2xSSC, 0.1% SDS, wash at 40 ° C for 15 minutes (twice).

 3) In 0.1xSSC, 0.1% SDS, wash at 0 ° C for 15 minutes (twice).

 4) Wash in O.lxSSC, 0.1% SDS at 55 ° C for 30 minutes (twice), and dry at room temperature. Low-intensity washing film:

 1) Take out the sample membrane of hybridization.

 2) 2xSSC, 0, 1% SDS, wash at 37 ° C for 15 minutes (twice).

 3) 0.1xSSC, 0.1% SDS, wash at 37 ° C for 15 minutes (twice).

4) O.lxSSC, 0.1% SDS, 40. Wash for 15 minutes (twice) and dry at room temperature. X-ray auto-development:

 -70 ° C, X-ray autoradiography (pressing time depends on the radioactivity of the hybrid spot).

 Experimental results:

 的 The hybridization experiments performed under low-intensity membrane washing conditions showed no significant difference in the radioactive intensity of the above two probe hybrid spots; while the hybridization experiments performed under high-intensity membrane washing conditions, the radioactive intensity of probe 1 was significantly stronger To the radioactive intensity of the hybridization spot of another probe. Therefore, the presence and differential expression of the polynucleotide of the present invention in different tissues can be analyzed qualitatively and quantitatively with the probe 1. Example 7 DNA Microarray

 Gene chip or gene microarray (DM Microarray) is a new technology currently being developed by many national laboratories and large pharmaceutical companies. The data is compared and analyzed on a carrier such as silicon using fluorescence detection and computer software to achieve the purpose of rapid, efficient, and high-throughput analysis of biological information. The polynucleotide of the present invention can be used as a target DM for gene chip technology for high-throughput research of new gene functions; search for and screen new tissue-specific genes, especially new genes related to diseases such as tumors; diagnosis of diseases, such as genetic diseases . The specific method steps have been reported in the literature. For example, see the literature DeRi si, JL, Lyer, V. & Brown, PO (1997) Science 278, 680-686. And the documents Helle, RA, Schema, M. , Chai, A., Shalom, D., (1997) PNAS 94: 2150-2155.

 ( ) Spotting '

 A total of 4,000 polynucleotide sequences of various full-length cDNAs are used as target MAs, including the polynucleotides of the present invention. They were respectively amplified by PCR, and the concentration of the amplified product was adjusted to about 500ng / ul after purification. The spots were spotted on a glass medium with a Cartesian 7500 spotter (purchased from Cartesian Company, USA). The distance between them is 280 μηι. The spotted slides were hydrated and dried, cross-linked in a UV cross-linker, and dried after elution to fix the DNA on the glass slides to prepare chips. The specific method steps have been reported in the literature. The sample post-processing steps in this embodiment are:

 1. Hydration in a humid environment for 4 hours;

 2. 0.2% SDS was washed for 1 minute;

 3. dd 0 wash twice, 1 minute each time;

4. NaBH _{4 is} blocked for 5 minutes;

 5. 95. C water for 2 minutes;

 6. Wash with 0.2% SDS for 1 minute;

7. Rinse twice with ddH ₂ 0; 8. Dry and store at 25 ° C in the dark for future use.

 (Two) probe marking

 Total mRNA was extracted from human mixed tissues and specific tissues (or stimulated cell lines) in one step, and the mRNA was purified with Oligotex raRNA Midi Ki t (purchased from QiaGen). Cy3dUTP (5-Amino-propargyl-2--deoxyuridine 5> -triphate coupled to Cy3 f luorescent dye, purchased from Amersham Phamacia Biotech) was used to label mRNA of human mixed tissue, and the fluorescent reagent Cy5dUTP (5-Amino- propargyl-2 ' -deoxyuridine 5'-triphate coupled to Cy5 fluorescent dye, purchased from Amersham Phamacia Biotech Company, labeled the body's specific tissue (or stimulated cell line) mRNA, and purified the probe to prepare a probe. For specific steps and methods, see:

 Schena, M., Shalon, D., Heller, R. (1996) Proc. Natl. Acad. Sci. USA. Vol. 93: 10614-10619. Schena, M., Shalon, Dar i., Davis, RW ( 1995) Science. 270 (20): 467-480.

 (Three) cross

 The probes from the above two tissues and the chips were respectively hybridized in a UniHyb ™ Hybridizat ion Solut ion (purchased from TeleChem) hybridization solution for 16 hours, and washed with a washing solution (1 x SSC, 0.2% SDS) at room temperature. Scanning was then performed with a ScanArray 3000 scanner (purchased from General Scanning, USA). The scanned images were analyzed and processed with Imagene software (Biodiscovery, USA) to calculate the Cy3 / Cy5 ratio of each point.

 The above specific tissues (or stimulated cell lines) are thymus, testis, muscle, spleen, lung, skin, sacral gland, liver, PMA + Ecv304 cell line, PMA-Ecv304 cell line, and non-starved L02 cell Strain, L02 cell line stimulated by arsenic for 1 hour, L02 cell line stimulated by arsenic for 6 hours prostate, heart, lung cancer, fetal bladder, fetal small intestine, fetal large intestine, fetal thymus, fetal muscle, fetal liver, fetal kidney, fetal spleen, fetus Brain, fetal lung and fetal heart. Draw a graph based on these 26 Cy3 / Cy5 ratios (Figure 1). It can be seen from the figure that the expression profiles of human myb protein 14 and human myb protein 9 according to the present invention are very similar.

Claims

Right

1. An isolated polypeptide-human myb protein 14, characterized in that it comprises: a polypeptide having the amino acid sequence shown in SEQ ID NO: 2, or an active fragment, analog, or derivative thereof.

 2. The polypeptide according to claim 1, characterized in that the amino acid sequence of the polypeptide, analog or derivative has at least 95% identity with the amino acid sequence shown in SEQ ID NO: 2.

 3. The polypeptide according to claim 2, characterized in that it comprises a polypeptide having the amino acid sequence shown in SEQ ID NO: 2.

 4. An isolated polynucleotide, characterized in that said polynucleotide comprises one selected from the group consisting of:

 (a) a polynucleotide encoding a polypeptide having an amino acid sequence shown in SEQ ID NO: 2 or a fragment, analog, or derivative thereof;

 (b) a polynucleotide complementary to polynucleotide (a); or

 (c) A polynucleotide that is at least 70% identical to (a) or (b).

 5. The polynucleotide according to claim 4, wherein the polynucleotide comprises a polynucleotide encoding an amino acid sequence shown in SEQ ID NO: 2.

 6. The polynucleotide according to claim 4, characterized in that the sequence of the polynucleotide comprises a sequence at positions 1776-2147 in SEQ ID NO: 1 or a sequence at positions 1-2739 in SEQ ID NO: 1. .

 7. A recombinant vector containing an exogenous polynucleotide, characterized in that it is constructed from the polynucleotide according to any one of claims 4 to 6 and a plasmid, virus or vector expression vector Recombinant vector.

 8. A genetically engineered host cell containing an exogenous polynucleotide, characterized in that it is selected from one of the following host cells:

 (a) a host cell transformed or transduced with the recombinant vector of claim 7; or

 (b) a host cell transformed or transduced with the polynucleotide according to any one of claims 4-6.

 9. A method for preparing a polypeptide having human myb protein 14 activity, characterized in that the method includes:

 (a) culturing the engineered host cell according to claim 8 under the condition of expressing human myb protein 14;

 (b) Isolating a polypeptide having human myb protein 14 activity from the culture.

10. An antibody capable of binding to a polypeptide, characterized in that the antibody is capable of binding to human myb protein 14 Specific binding antibody.

 11. A class of compounds that mimic or regulate the activity or expression of a polypeptide, characterized in that they are compounds that mimic, promote, antagonize or inhibit the activity of human myb protein 14.

 12. The compound according to claim 11, characterized in that it is a polynucleotide sequence shown in SEQ ID NO: 1 or an antisense sequence thereof. '

 13. The use of the compound according to claim 11, characterized in that the compound is used for a method for regulating the activity of human myb protein 14 in vivo and in vitro.

 14. A method for detecting a disease or susceptibility to a polypeptide related to any one of claims 1-3, characterized in that it comprises detecting the expression level of the polypeptide, or detecting the polypeptide Or detecting a nucleotide variation in a polynucleotide that causes abnormal expression or activity of the polypeptide.

 15. The use of the polypeptide according to any one of claims 1-3, characterized in that it is used for screening mimics, agonists, antagonists or inhibitors of human rayb protein 14; or for peptide fingerprinting Atlas identification.

 16. The use of a nucleic acid molecule according to any one of claims 4 to 6, characterized in that it is used as a primer for a nucleic acid amplification reaction, or as a probe for a hybridization reaction, or for manufacturing a gene chip Or microarray.

 17. The use of the polypeptide, polynucleotide or compound according to any one of claims 1-6 and 11, characterized in that the polypeptide, polynucleotide or mimetic, agonist, The antagonist or inhibitor is composed of a safe and effective dose with a pharmaceutically acceptable carrier as a pharmaceutical composition for diagnosing or treating a disease associated with human myb protein 14 abnormality.

 18. The use of the polypeptide, polynucleotide or compound according to any one of claims 1-6 and 11, characterized in that the polypeptide, polynucleotide or compound is used for preparing a treatment such as a malignant tumor, Hematological diseases, HIV infection and immune diseases and drugs of various inflammations.