WO2001072983A1 - A new polypeptide- human peroxydase 11 and the polynucleotide encoding it - Google Patents

Abstract

The present invention discloses a new polypeptide- human peroxydase 11, the poynucleotide encoding it and a method producing the polypeptide by DNA recombinant technology. The present invention further discloses a method treating various disorders, e.g., malignant neoplasm, hematopathy, HIV infection and immunological disease and various inflammation etc.. The present invention also discloses an antagonist of the polypeptide and its therapeutic action. The present invention further discloses the use of the polynucleotide encoding the new human peroxydase 11.

Description

 A new polypeptide-human peroxidase 11 and a polynucleotide encoding the same TECHNICAL FIELD

 The present invention belongs to the field of biotechnology. Specifically, the present invention describes a new polypeptide, a human peroxidase 1 1, and a polynucleotide sequence encoding the polypeptide. The invention also relates to a preparation method and application of the polynucleotide and the polypeptide. Background technique

 Hydrogen peroxide (H202) is a major form of reactive oxygen species (ROS) in the body. During aerobic metabolism, the production efficiency of hydrogen peroxide is quite high. In general, in mitochondria, 1-2% of oxygen can be converted into 02 in the intermediate step of NADH dehydrogenase and ubiquinone in the respiratory chain. Superoxide can be converted to hydrogen peroxide by mitochondrial hydrogen peroxide dismutase. Low concentrations of hydrogen peroxide can cause apoptosis, and high concentrations of hydrogen peroxide can cause necrosis. Many reports have shown that hydrogen peroxide plays an important role in cytotoxicity and necrosis caused by stimulants (eg, ceramide, antibiotic A, quinone salt, and tumor necrosis factor, etc.). It also plays a role in some human diseases such as Alzheimer's disease, diabetes, stroke and AIDS dementia syndrome.

 The major enzyme defense systems that protect cells from poisoning by hydrogen peroxide are the glutathione redox cycle and catalase. Catalase converts hydrogen peroxide to H 20 and 02. Catalase is mainly present in the peroxisome of the cell, with the highest activity in liver and red blood cells, followed by in kidney and adipose tissue, moderate activity in lung and spleen, and relatively low activity in heart and brain.

 In eukaryotes and some prokaryotes, catalase is composed of four identical subunits. Each subunit is bound to a heme I X group. A conserved tryptophan is a near-center ligand of heme, and a conserved arginine is also involved in heme binding. A conserved histidine is necessary for catalysis.

 Gene chip analysis revealed that in the thymus, testis, muscle, spleen, lung, skin, thyroid, liver, PMA + Ecv 304 cell line, PMA-E cv 304 cell line, unstarved L 02 cell line, arsenic stimulation 1 hour L 02 cell line, arsenic stimulated L 02 cell line 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, In the fetal lung and fetal heart, the expression profile of the polypeptide of the present invention is very similar to the expression profile of human peroxidase 10, so the functions of the two may also be similar. The invention is named human peroxidase 11.

As mentioned above, the human peroxidase 1 1 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. It is necessary to identify more human peroxidase π proteins involved in these processes, especially the amino acid sequence of this protein. Isolation of the new human peroxidase 1 1 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 agents for disease 1 and it is therefore important to isolate its coding DNA. Disclosure of invention

 It is an object of the present invention to provide isolated new polypeptides-human peroxidase 1 1 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 peroxidase II.

 Another object of the present invention is to provide a genetically engineered host cell containing a polynucleotide encoding human peroxidase 1 1.

 Another object of the present invention is to provide a method for producing human peroxidase 1 1.

 Another object of the present invention is to provide an antibody against the polypeptide-human peroxidase 1 1 of the present invention. Another object of the present invention is to provide mimetic compounds, antagonists, agonists, and inhibitors of the human peroxidase 11 of the polypeptide of the present invention.

 Another object of the present invention is to provide a method for diagnosing and treating diseases related to abnormalities of human peroxidase 11.

 The present invention relates to an isolated polypeptide, which is of human origin, and includes: a polypeptide having the amino acid sequence of SEQ ID D. 2, or a conservative variant, biologically active fragment, or derivative thereof. Preferably, 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 D. 2;

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

 (c) A polynucleotide having at least 70% identity to a polynucleotide sequence of (a) or (b).

 More preferably, the sequence of the polynucleotide is one selected from the group consisting of: (a) a sequence having positions 793-1 to 095 in SEQ ID NO: 1; and (b) a sequence having 1- in SEQ ID NO: 1 Π 12-bit sequence.

The invention further relates to a vector, in particular an expression vector, containing the polynucleotide of the invention; a host cell genetically engineered with the vector, including a transformed, transduced or transfected host cell; and a method comprising culturing said Host cell and method of preparing the polypeptide of the present invention by recovering the expression product. 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 peroxidase 11 protein, which comprises utilizing the polypeptide of the invention. The invention also relates to compounds obtained by this method.

 The invention also relates to a method for detecting a disease or susceptibility to disease associated with abnormal expression of human peroxidase 11 protein in vitro, which comprises detecting a mutation in the polypeptide or a polynucleotide sequence encoding the same in a biological sample, or detecting a biological The amount or biological activity of a polypeptide of the invention in a sample.

 The invention also relates to a pharmaceutical composition 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 peroxidase 1 1.

 Other aspects of the invention will be apparent to those skilled in the art from the disclosure of the techniques herein.

 The following terms used in this specification and claims have the following meanings unless specifically stated otherwise:

"Nucleic acid sequence" refers to oligonucleotides, nucleotides or polynucleotides and fragments or parts thereof, and can also refer to genomic or synthetic DNA or RNA, which can be single-stranded or double-stranded, representing the sense strand 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 substituted amino acid has similar crusting or chemical properties 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" refers to an alteration in the amino acid sequence or nucleotide sequence that results in an increase in one or more amino acids or nucleotides compared to a naturally occurring molecule. "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. Similar 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 to specific antibodies in a suitable animal or cell.

 An "agonist" refers to a molecule that, when combined with human peroxidase 11, can cause changes in the protein and thereby 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 peroxidase 11.

 An "antagonist" or "inhibitor" refers to a molecule that, when combined with human peroxidase 11, can block or regulate the biological or immunological activity of human peroxidase 11. Antagonists and inhibitors may include proteins, nucleic acids, carbohydrates or any other molecule that can bind human peroxidase 11.

 "Regulation" refers to a change in the function of human peroxidase 11, including an increase or decrease in protein activity, a change in binding characteristics, and any other biological, functional, or immune properties of human peroxidase 11.

 "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 peroxidase 11 using standard protein purification techniques. Substantially pure human peroxidase 11 produces a single main band on a non-reducing polyacrylamide gel. The purity of the human peroxidase 11 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. The inhibition of such 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 conditions with reduced stringency allow non-specific binding, because conditions with reduced stringency require that the two sequences bind to each other as either specific or selective interactions.

"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 percentage identity can be determined electronically, such as by the MEGALIGN program (Lasergene software package, DNASTAR, Inc., Madison Wis.). The MEGALIGN program can compare two or more sequences according to different methods, such as the Cluster method (Higgins, DG and PM Sharp (1988) Gene 73: 237-244). _{0 The} Cluster method arranges groups of sequences by checking the distance between all pairs. Into clusters. The clusters are then assigned in pairs or groups. Sequence of two amino acids The percent identity between column A and sequence B is calculated by the following formula: The number of matching residues between sequence A and sequence B

 X 100 The number of residues in sequence A-the number of spacer residues in sequence A-the number of spacer residues in sequence B can also be determined by the Cluster method or by methods known in the art such as Jotun Hein. J., (1990) Methods in emzumology 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 substitutions, 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 DNA or RNA sequence. "Antisense strand" refers to a nucleic acid strand that is complementary to a "sense strand."

 "Derivative" refers to a chemical modification of HFP or a nucleic acid encoding it. 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 human peroxidase 11.

 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 existing in the natural state. . As used herein, "isolated human peroxidase U" means that human peroxidase 11 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 peroxidase 11 using standard protein purification techniques. Substantially pure polypeptides can produce a single main band on a non-reducing polyacrylamide gel. The purity of human peroxidase 11 polypeptide can be analyzed by amino acid sequence.

 The present invention provides a new polypeptide, human peroxidase 11, which is basically composed of the amino acid sequence shown in SEQ ID NO: 2. The polypeptide of the present invention may be a recombinant polypeptide, a natural polypeptide, or a synthetic polypeptide, and preferably a recombinant polypeptide. The polypeptides of the 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 human peroxidase 11. As used herein, the terms "fragment", "derivative" and "analog" refer to a human peroxidase that substantially retains the invention

11 Peptides of the same biological function or activity. A fragment, derivative, or analog of the polypeptide of the present invention may be: (I) a type 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 is The amino acid may or may not be encoded by the genetic code; or (II) such a type in which a group on one or more amino acid residues is replaced by another group to include a substituent; or (ΠΙ) 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 the leader sequence or secreted sequence or the sequence used to purify this polypeptide or protease sequence) As explained 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 cDNA library of human fetal brain tissue. It contains a polynucleotide sequence with a total length of 1712 bases, and its open reading frame 793-1095 encodes 100 amino acids. According to the comparison of gene chip expression profiles, it was found that this polypeptide has a similar expression profile as human peroxidase 10, and it can be inferred that the human peroxidase 11 has a similar function as human peroxidase 10.

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. As used in the present invention, "degenerate variant" refers to a protein or polypeptide having SEQ ID NO: 2 in the present invention, but is identical to the coding region shown in SEQ ID NO: 1 Differentiated nucleic acid sequences are listed.

 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 can be naturally occurring allelic variants or non-naturally occurring variants. These nucleotide variants include substitution variants, deletion variants, and insertion variants. As known in the art, 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. 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, 60 ° C; or (2) Add a denaturant during hybridization, such as 50% (v / v) formamide, 0.1% calf serum / 0.1% F i co ll, 42 ° C, etc .; or (3) only between the two sequences Crosses occur at least 95% or more, and more preferably 97% or more. In addition, 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 herein, a "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 More than nucleotides. Nucleic acid fragments can also be used in nucleic acid amplification techniques, such as PCR, to identify and / or isolate polynucleotides encoding human peroxidase 1 1.

 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 human peroxidase 1 1 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 DNA sequence from the genomic DNA; 2) chemically synthesizing the DNA sequence to obtain the double-stranded DNA of the polypeptide.

Of the methods mentioned above, genomic DNA isolation is the least commonly used. Direct chemical synthesis of DNA sequences Is the method of choice. The more commonly used method is the isolation of cDNA sequences. The standard method for isolating cDNA of interest is to isolate 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 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 Manua 1, 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 selected from these cDNA libraries by conventional methods. These methods include (but are not limited to): (l) DNA-DNA or DNA-RNA hybrids; (2) the presence or absence of marker gene functions; (3) measuring the level of human peroxidase 11 transcripts; (4) Detection of gene-expressed protein products 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 here is generally 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).

 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 expressed by the human peroxidase 11 gene.

 DNA / RNA Amplification Using PCR Techniques (Saiki, et al. Science

1985; 230: 1350-1354) are preferred for obtaining the genes of the 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) may be preferably used. The primers used for PCR may be appropriately based on the polynucleotide sequence information of the present invention disclosed herein. Select and synthesize using conventional methods. The amplified DNA / RNA fragments can be isolated and purified by conventional methods such as by gel electrophoresis.

 The polynucleotide sequence of the gene of the present invention or various DNA fragments and the like obtained as described above can be determined 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, the sequencing must 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, a host cell produced by genetic engineering using the vector of the present invention or directly using a human peroxidase 11 coding sequence, and a method for producing a polypeptide of the present invention by recombinant technology. In the present invention, a polynucleotide sequence encoding human peroxidase 11 can 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 Chem. 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 known to those skilled in the art can be used to construct expression vectors containing a DNA sequence encoding human peroxidase 11 and appropriate transcription / translation regulatory elements. These methods include in vitro recombinant DNA technology, DNA synthesis technology, in vivo recombination technology, etc. (Sambroook, et al. Molecular Cloning, a Laboratory Manual, cold Spring Harbor Laboratory. New York, 1989). The DNA sequences may be bad ¹ J operably linked to an appropriate promoter in the expression vector, to direct 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 from 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 adenovirus 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 peroxidase 11 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, chain Fungal 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 DNA sequence described in the present invention or a recombinant vector containing the DNA sequence can be performed using conventional techniques well known to those skilled in the art. 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 CaCl ₂ 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.

 Using conventional recombinant DNA technology, the polynucleotide sequence of the present invention can be used to express or produce recombinant human peroxidase 11 (Science, 1984; 224: 1431). Generally there are the following steps:

(1) using the polynucleotide (or variant) encoding human peroxidase 11 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 desired, recombinant proteins can be separated 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 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. Brief description of the drawings

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

FIG. 1 is a comparison diagram of gene chip expression profiles of the present inventors peroxidase 11 and human peroxidase 10. The upper graph is a graph of the expression profile of human peroxidase 11 and the lower graph is the graph of the expression profile of human peroxidase 10. 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 indicates unstarved L02, 8 indicates L02 +, lhr, As ³⁺ , and 9 indicates ECV304 PMA-, 10 means ECV304

! 0 PMA +, 11 indicates fetal liver, 12 indicates normal liver, 13 indicates thyroid, 14 indicates skin, 15 indicates fetal lung, 16 indicates lung, 17 indicates lung cancer, 18 indicates fetal spleen, 19 indicates spleen, 20 indicates prostate, and 21 indicates fetal heart rate. , 22 means the heart, 23 means muscle, 24 means testis, 25 means fetal thymus, 26 means thymus.

 Figure 1 shows the polyacrylamide gel electrophoresis (SDS-PAGE) of isolated human peroxidase 11. llkDa is the molecular weight of the protein. The arrow indicates the isolated protein band. The best way to implement the invention

 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. In the following examples, the experimental methods without specific conditions are generally performed according to conventional conditions such as those described in Sambrook et al., Molecular Cloning: Laboratory Manual (New York: Cold Spring Harbor Laboratory Press, 1989), or according to the manufacturer Suggested conditions.

 Example 1: Cloning of human peroxidase 11

 Human fetal brain total RNA was extracted by one-step method with guanidine isothiocyanate / phenol / chloroform. Poty (A) mRNA was isolated from total RNA using Quik mRNA Isolation Kit (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 multicloning site of pBSK (+) vector (Clontech) to transform DH5a. The bacteria formed a cDNA library. Dye terminate cycle reaction ion sequencing kit (Perkin-Elmer) and ABI 377 automatic sequencer (Perkin-Elmer) were used to determine the sequences at the 5 'and 3' ends of all clones. The determined cDNA sequence was compared with the existing public DNA sequence database (Genebank), and it was found that the cDNA sequence of one of the clones 0139dll was new DNA. The inserted cDNA fragment contained in this clone was determined in both directions by synthesizing a series of primers. The results show that the full-length cDNA contained in the 0139dll clone is 1712bp (as shown in Seq ID NO: 1), from 793bp to 1095bp there is a 302bp open reading frame (0RF), which encodes a new protein (such as Seq ID NO : Shown in 2). We named this clone pBS-0139dll and the encoded protein was named human peroxidase 11. Example 2: Cloning of a gene encoding human peroxidase 11 by RT-PCR

 CDNA was synthesized using fetal brain total RNA as a template and oligo-dT as a primer.

After purification of Qiagene's kit, PCR amplification was performed with the following primers:

 Primerl: 5'- ATTGAAGATGGGAATGTGATCTGC-3 '(SEQ ID NO: 3)

 Primer2: 5'- TTTTAAGCAAGGTTTTAATTAAGC- 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 'end reverse sequence in SEQ ID NO: 1.

Amplification conditions: 50 mmol / L KC1, 10 mmol / L Tris-Cl, (pH 8.5), 1.5 mmol / L MgCl ₂ , 200 μ mol / L dNTP, lOpmol primers in a 50 μ 1 reaction volume, 1U of Taq DNA polymerase (Clontech). The reaction was performed on a PE9600 DNA thermal cycler (Perkin-Elmer) for 25 cycles under the following conditions: 94 ° C 30sec; 55. C 30sec; 72 ° C 2min. During RT-PCR, β-actin was set as a positive control and template blank was set 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 the 1-1712 bp shown in SEQ ID NO: 1. Example 3: Northern blot analysis of human peroxidase 11 gene expression:

Total RNA extraction in one step [Anal. Biochem 1987, 162, 156-159]. This method involves acid guanidinium thiocyanate phenol-chloroform extraction. That is, the tissue is homogenized with 4M guanidinium 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 ) And centrifuge after mixing. The aqueous layer was aspirated, isopropanol (0.8 vol) was added and the mixture was centrifuged to obtain RM precipitate. The resulting RNA pellet was washed with 70% ethanol, dried and dissolved in water. With 20μ _§ ΙΝΑ, containing 20mM 3- (Ν- morpholino) propanesulfonic acid (pH7.0) - electrophoresed on a 1.2% agarose gel ImM EDTA- 2.2M formaldehyde - 5mM sodium acetate. It was then transferred to a nitrocellulose membrane. Preparation cc- ³² P dATP with ³² P- DNA probe labeled by the random primer method. The DNA probe used was the PCR amplified human peroxidase 11 coding region sequence (793bp to 1095bp) shown in FIG. 1. 32P-labeled probe (about 2 X 10 ⁶ cpm / ml) was hybridized with a nitrocellulose membrane to which RNA was transferred at 42 ° C overnight in a solution containing 50% formamide-25mM KH ₂ P0, (pH7.4) -5 x SSC-5 x Denhardt's solution and 200 μg / ml salmon sperm DNA. After hybridization, the filters were placed in 1 x SSC-0.1% SDS at 55. C Wash for 30min. Then, Phosphor Imager was used for analysis and quantification. Example 4: In vitro expression, isolation and purification of recombinant human peroxidase 11

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

Primer 3: 5 ·-CCCCATATGATGGGGGTGGGGGAGAAGGGTGAC- 3 '(Seq ID No: 5) Primer4: 5,-CATGGATCCTTAAGAGATGAGTCTTGAAGGCAG-3' (Seq ID No: 6) The 5 'ends of these two primers contain Ndel and BamHI restriction sites, respectively , Followed by the coding sequences of the 5 'and 3' ends of the gene of interest, respectively. The Ndel and BamHI restriction sites correspond to the selectivity on the expression vector plasmid pET-28b (+) (Novagen, Cat. No. 69865.3) Endonuclease site. The pBS-0139dll plasmid containing the full-length target gene was used as a template for the PCR reaction. The PCR reaction conditions are: pBS- 0139dll is included in the total volume of 50 μ 1 Plasmid 10pg, bow 1? 1: 111161 "-3 and?] ^ 11161" -4 points and another!] Is 10 11101, Advantage polymerase Mix (Clontech) 1 μ1. Cycle parameters: 94 ° C 20s, 60 ° C 30s, 68 ° C 2 min, a total of 25 cycles. Ndel and BamHI were used to double digest the amplified product and plasmid pET-28 (+), respectively, and large fragments were recovered and ligated with T4 ligase. The ligation product was transformed into the colibacillus DH5α by the calcium chloride method. After being cultured on an LB plate containing kanamycin (final concentration 30 _{M g} / ml) overnight, positive clones were selected by colony PCR method and sequenced. A positive clone (pET-0139dll) with a correct sequence was selected, and the recombinant plasmid was transformed into E. coli BL21 (DE3) plySs (product of Novagen) using the calcium chloride method. In LB liquid medium containing kanamycin (final concentration 30 μg / ml), the host bacteria BL21 (pET-0139dll) was cultured at 37 ° C to the logarithmic growth phase, and IPTG was added to a final concentration of 1 mmol / L, Continue incubation for 5 hours. The bacteria were collected by centrifugation, and the supernatant was collected by centrifugation, and the supernatant was collected by centrifugation. The affinity chromatography column His. Bind Quick Cartridge (product of Novagen) was used for chromatography to obtain 6 histidines (6His-Tag). Purified human protein peroxidase 11. After SDS-PAGE electrophoresis, a single band was obtained at 33 kDa (Figure 2). The band was transferred to a PVDF membrane and the N-terminal amino acid sequence was analyzed by the Edams hydrolysis method. As a result, the 15 amino acids at the N-terminus were identical to the 15 amino acid residues at the N-terminus shown in SEQ ID NO: 2. Example 5 Production of anti-human peroxidase 11 antibodies

 The following peptides specific to human peroxidase 11 were synthesized using a peptide synthesizer (product of PE):

 NH2-Met-Gly-Val-Gly-Glu-Lys-Gly-Asp-Ser-Arg-Val-Leu-Pro-Phe-Cys-COOH (SEQ ID NO: 7). The polypeptide is coupled to hemocyanin and bovine serum albumin to form a complex, respectively. For methods, see: Avrameas, et a 1. Immunochemi stry, 1969; 6: 43. Rabbits were immunized with 4 mg of the hemocyanin polypeptide complex and complete Freund's adjuvant, and 15 days later, the hemocyanin polypeptide complex and incomplete Freund's adjuvant were used to boost the immunity once. 15A titer plate coated with 15 g / ml bovine serum albumin polypeptide complex was used as an ELISA to determine the antibody titer in rabbit serum. Protein A-Sepharose was used to isolate total IgG from antibody-positive rabbit serum. 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 demonstrated that the purified antibody specifically binds to human peroxidase 11. Example 6: 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. For example, 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. 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 a filter hybridization method. Acid sequence or a homologous polynucleotide sequence thereof. Filter hybridization methods include dot blotting, Southern imprinting, Nor thern blotting, and copying methods. They all use the same steps to fix the polynucleotide sample to be tested on the filter and then hybridize. 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) 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. 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 selection of oligonucleotide fragments for use as hybridization probes from the polynucleotide SEQ ID NO: 1 of the present invention should follow the following principles and several aspects to be considered:

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 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;

 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 '-TGGGGGTGGGGGAGAAGGGTGACTCCAGGGTCCTTCCATTT-3' (SEQ I D NO: 8)

Probe 2 (probe2), which belongs to the second type of probe, is equivalent to the replacement mutant sequence (41Nt) of the gene fragment of SEQ ID NO: 1 or its complementary fragment: 5 '-TGGGGGTGGGGGAGAAGGGTCACTCCAGGGTCCTTCCATTT-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" (U998 Second Edition) [US] Sambrook et al., Science Press.

 Sample Preparation:

1. Extract DNA 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 1,000 g for 10 minutes. 3) Suspend the pellet (approximately 10 ml / g) with a cold homogenization buffer (0.25 mol / L sucrose; 25 crypto ol / L Tris-HCl, pH 7.5; 25 mmol / LnaCl; 25 mmol / L MgCl ₂ ). 4) Homogenize the tissue suspension 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 (add 1-5 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, DMA extraction of phenol

Steps: 1) Wash cells with 1-10 ml of cold PBS and centrifuge at 1000g for 10 minutes. 2) Resuspend the pelleted cells (1 × 10 ⁸ cells / ml) with cold cell lysate and apply 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 protease! (To a final concentration of 200ug / ml. 5) 50 ^Q C incubation reaction for 1 hour or at 37. 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 aqueous phase containing DNA 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. 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. 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 vortex or Pipetting with a dropper, while gradually increasing the TE, mixed until fully dissolved DNA, every 1-5 X 10 ⁶ cells extracted about plus 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 the DNA solution to a final concentration of 100ug / ml, and incubate at 37 ° C for 30 minutes. 9) Add SDS and proteinase K, the final concentrations are 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 aqueous phase, add 180 vols of 2mol / L sodium acetate and 2.5 vols of cold ethanol, mix and set at -20 ° C for 1 hour. 13) Wash the pellet with 70% ethanol and 100% ethanol, air dry, and resuspend the nucleic acid. The process is the same as steps 3-6. 14) Measure A ₂₆ . And A ₂₈ . To detect the purity and yield of DNA. 15) Store at -20 ° C after dispensing. Preparation of sample film:

 1) Take 4 x 2 pieces of nitrocellulose membranes (NC membranes) of appropriate size, and mark the spotting position and sample number lightly with a pencil. Two NC membranes are needed for each probe for subsequent experiments. In the step, the film is washed with high-strength conditions and strength conditions, respectively.

 2) Aspirate and control 15 microliters each, spot on the sample film, and dry at room temperature.

 3) Place on filter paper impregnated with 0.1 mol / LNaOH, 1.5raol / LNaCl for 5 minutes (twice), dry and place on filter paper impregnated with 0.5mol / L Tris-HCl (pH7.0), 3mol / LNaCl Allow to dry for 5 minutes (twice).

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

 Labeling of probes

1) 3 μl Probe (0.10D / 10 μ 1), add 2 μ I inase buffer, 8-10 uCi y- ^{, 2} P-dATP + 2U Kinase, to make up to a final volume of 20 μ 1.

 2) Incubate at 37 ° C for 2 hours.

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

 4) Pass through a 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) The ³² P-Probe (the second peak is free γ- ³² P-dATP) is prepared after the collection solutions of the first peak are combined.

 Pre-hybridization

The sample membrane was placed in a plastic bag, and 3-10 mg of a pre-hybridization solution (lOxDenhardfs; 6xSSC, 0.1 mg / ml) was added. CT DNA (calf thymus DNA). ), After sealing the bag, shake at 68 ° C 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) 0.1xSSC, 0.1% SDS, wash at 40 ° C for 15 minutes (twice).

 4) In 0.1xSSC, 0.1½SDS, wash at 55 ° C for 30 minutes (twice), and dry at room temperature.

 Low-intensity washing film:

 1) Take out the hybridized sample membrane.

 2) 2xSSC, 0.1% SDS, wash at 37 ° C for 15 minutes (twice).

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

 4) In 0.1xSSC, 0.1% SDS, wash at 40 ° C 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:

 The hybridization experiments performed under low-intensity membrane washing conditions showed no significant difference in the radioactive intensity of the above two probes. However, in the hybridization experiments performed under high-intensity membrane washing conditions, the radioactive intensity of probe 1 was significantly stronger than that of hybridization spots. The radioactive intensity of the hybridization spot of the other 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 microarrays or DNA microarrays are new technologies currently being developed by many national laboratories and large pharmaceutical companies. It refers to the orderly and high-density arrangement of a large number of target gene fragments on glass, 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 target DNA 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 hereditary diseases . The specific method steps have been reported in the literature. For example, see DeRisi, JL, Lyer, V. & Brown, P.0. (1997) Science 278, 680-686. And Helle, RA, Schema, M. , Chai, A., Shalom, D., (1997) PNAS 94: 2150-2155.

 (A) spotting

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

 1. Hydration in a humid environment for 4 hours;

 2. 0.2% SDS was washed for 1 minute;

3. Wash twice with ddH ₂ 0 for 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 dry, 25. C Store in a dark place for future use.

 (2) Probe marking

 Total mRNA was extracted from human mixed tissues and specific tissues (or stimulated cell lines) using a one-step method, and the mRNA was purified using Oligotex mRNA Midi Kit (purchased from QiaGen). The fluorescent reagent Cy3dUTP ( 5— Amino- propargy 2'- deoxyuridine 5'- triphate coupled to Cy3 fluorescent dye, purchased from Amersham Phamac ia Biotech Company) mRNA of human mixed tissue was labeled with Cy5dUTP (5-Amino-propargyl-2'-deoxyuridine) fluorescent reagent 5'-tr iphate coupled to Cy5 fluorescent dye, purchased from Amersham Phamacia Biotech, 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, Dari., Davis, RW (1995 ) Science. 270. (20): 467-480.

(Three) cross

The probes from the two types of tissues and the chips were hybridized in a UniHyb ™ Hybridization Solution (purchased from TeleChem) hybridization solution for 16 hours, washed with a washing solution (1 x SSC, 0.2% SDS) at room temperature, and then scanned with ScanArray 3000. Scanner (purchased from General Scanning Company, USA) for scanning, and the scanned image was processed with In gene software (Biodiscovery, USA) for data Analyze and calculate the Cy3 / Cy5 ratio of each point.

 The above specific tissues (or stimulated cell lines) are thymus, testis, muscle, spleen, lung, skin, thyroid, liver, PMA + Ecv304 cell line, PMA-Ecv304 cell line, non-starved L02 cell line, 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, fetal 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 peroxidase 11 and human peroxidase 10 according to the present invention are very similar. Industrial applicability

 The polypeptide of the present invention and the antagonists, agonists and inhibitors of the polypeptide can be directly used in the treatment of diseases, for example, it can treat malignant tumors, adrenal deficiency, skin diseases, various inflammations, HIV infections and immune diseases.

 Hydrogen peroxide (H202) is a major form of reactive oxygen species (ROS) in the body. During aerobic metabolism, the production efficiency of hydrogen peroxide is quite high. In general, in mitochondria, 1-2% of oxygen can be converted to 02 in the intermediate step of NADH dehydrogenase and ubiquinone in the respiratory chain. Superoxide can be converted to hydrogen peroxide by mitochondrial hydrogen peroxide dismutase. Low concentrations of hydrogen peroxide can cause apoptosis, and high concentrations of hydrogen peroxide can cause necrosis. Many reports have shown that hydrogen peroxide plays an important role in cytotoxicity and necrosis caused by stimulants (eg, ceramide, antibiotic A, quinone salt, and tumor necrosis factor, etc.). It also plays a role in some human diseases such as Alzheimer's disease, diabetes, stroke and AIDS dementia syndrome.

 The glutathione redox cycle and catalase are the main catalase defense systems in the cell. Catalase converts hydrogen peroxide to H20 and 02. Catalase mainly exists in the peroxisome of the cell, and has the highest activity in the liver and red blood cells, and is closely related to the detoxification function of the liver and oxygen carrying of red blood cells.

 It can be seen that abnormal expression of the specific catalase motif will cause malfunction of the polypeptide containing the motif of the present invention, cause abnormal hydrogen peroxide concentration, thereby leading to cytotoxic effects, affecting physiological processes, and causing related diseases. Such as Alzheimer's disease, diabetes, stroke and AIDS dementia syndrome, liver cancer and other tumors, growth and development disorders.

 It can be seen that the abnormal expression of catalase 11 of the present invention will produce various diseases, especially Alzheimer's disease, diabetes, stroke and AIDS dementia syndrome, liver cancer and other tumors, growth and development disorders, nervous system Diseases, including but not limited to:

Tumors of various tissues: liver cancer, stomach 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, nasopharyngeal cancer, laryngeal cancer, tracheal tumor, fibroma, fibrosarcoma, lipoma, liposarcoma, smooth muscle tumor

 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, stunting, dwarfism, sexual retardation

 Nervous system diseases: Alzheimer's disease, Parkinson's disease, chorea, depression, amnesia, Henyenne disease, epilepsy, migraine, multiple sclerosis

 The abnormal expression of catalase 1 1 of the present invention will also produce certain hereditary, hematological and immune system diseases.

 The polypeptide of the present invention and the antagonists, agonists and inhibitors of the polypeptide can be directly used in the treatment of diseases, for example, it can treat various diseases, especially Alzheimer's disease, diabetes, stroke and AI DS, dementia syndrome, liver cancer Other tumors, growth and development disorders, nervous system diseases, certain hereditary, hematological diseases, and immune system diseases.

 The invention also provides methods for screening compounds to identify agents that increase (agonist) or suppress (antagonist) human peroxidase 1 1. Agonists enhance human peroxidase 11 to stimulate biological functions such as cell proliferation, while antagonists prevent and treat disorders related to cell proliferation, such as various cancers. For example, mammalian cells or membrane preparations expressing human peroxidase 1 1 can be cultured with labeled human peroxidase 1 1 in the presence of a drug. The ability of the drug to increase or block this interaction is then determined.

 Antagonists of human peroxidase 11 include antibodies, compounds, receptor deletions, and the like that have been screened. Antagonists of human peroxidase 11 can bind to human peroxidase 1 1 and eliminate its function, or inhibit the production of the polypeptide, or bind to the active site of the polypeptide so that the polypeptide cannot perform biological functions.

 When screening compounds as antagonists, human peroxidase 1 1 can be added to the bioanalytical assay to determine whether the compound is an antagonist by measuring the effect of the compound on the interaction between human peroxidase 11 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 peroxidase 11 can be obtained by screening a random peptide library composed of various possible combinations of amino acids bound to a solid phase. When screening, human peroxidase 11 molecules should generally be labeled.

The present invention provides a method for producing an antibody using a polypeptide, a fragment, a derivative, an analog thereof, or a cell thereof as an antigen. These antibodies can be polyclonal or monoclonal antibodies. The invention also provides Antibodies against human peroxidase 11 epitopes These antibodies include (but are not limited to): polyclonal antibodies, monoclonal antibodies, chimeric antibodies, single chain antibodies, Fab fragments, and fragments produced by Fab expression libraries.

 Polyclonal antibodies can be produced by injecting human peroxidase 11 directly into immunized animals (such as rabbits, mice, rats, etc.). A variety of adjuvants can be used to enhance the immune response, including but not limited to Freund's adjuvant. . Techniques for preparing monoclonal antibodies to human peroxidase 11 include, but are not limited to, hybridoma technology (Kohler and Milstein. Nature, 1975, 256: 495-497), triple tumor technology, human beta-cell hybridoma technology, and EBV-hybridization. Tumor technology, etc. Chimeric antibodies that bind human constant regions and 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 peroxidase 11.

 Antibodies against human peroxidase 11 can be used in immunohistochemistry to detect human peroxidase 11 in biopsy specimens.

 Monoclonal antibodies that bind to human peroxidase 11 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 peroxidase 11 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 peroxidase 11 positive cells.

 The antibodies in the present invention can be used to treat or prevent diseases related to human peroxidase 11. Administration of an appropriate amount of antibody can stimulate or block the production or activity of human peroxidase 11.

 The invention also relates to a diagnostic test method for quantitative and localized detection of human peroxidase 11 levels. These tests are well known in the art and include FISH assays and radioimmunoassays. The level of human peroxidase 11 detected in the test can be used to explain the importance of human peroxidase 11 in various diseases and to diagnose diseases in which human peroxidase 11 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 peroxidase 11 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 peroxidase 11. Recombinant gene therapy vectors (such as viral vectors) can be designed to express mutated human peroxidase 11 to inhibit endogenous human peroxidase 11 activity. For example, a variant of human peroxidase 11 Human peroxidase 11, which may be shortened and lack the signaling domain, although it can bind to downstream substrates, lacks signaling activity. Therefore, the recombinant gene therapy vector can be used for treating diseases caused by abnormal expression or activity of human peroxidase 11. 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 human peroxidase 11 into a cell. Methods for constructing recombinant viral vectors carrying a polynucleotide encoding human peroxidase 11 can be found in the literature (Sambrook, et al.). In addition, a recombinant polynucleotide encoding human peroxidase 11 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 DNA) and ribozymes that inhibit human peroxidase 11 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 technology, such as solid-phase phosphate amide chemical synthesis to synthesize oligonucleotides. Antisense RNA molecules can be obtained by in vitro or in vivo transcription of a DNA sequence encoding the RNA. This DNA sequence has been integrated downstream of the vector's RNA polymerase promoter. 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 peroxidase 11 can be used for the diagnosis of diseases related to human peroxidase 11. The polynucleotide encoding human peroxidase 11 can be used to detect the expression of human peroxidase 11 or the abnormal expression of human peroxidase 11 in a disease state. For example, a DNA sequence encoding human peroxidase 11 can be used to hybridize biopsy specimens to determine the expression of human peroxidase 11. Hybridization techniques include Southern blotting, Northern blotting, in situ hybridization, and so on. These techniques and methods are publicly available and mature, and related kits are commercially available. A part or all of the polynucleotide of the present invention can be used as a probe 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 a tissue. Human peroxidase 11 specific primers can also be used to detect human peroxidase 11 transcripts by performing RNA-polymerase chain reaction (RT-PCR) in vitro amplification.

Detection of mutations in the human peroxidase 11 gene can also be used to diagnose human peroxidase 11-related diseases. Human peroxidase 11 mutations include point mutations, translocations, deletions, recombinations, and any other abnormalities compared to normal wild-type human peroxidase 11 DNA sequences. Mutations can be detected using existing techniques such as Southern blotting, DNA sequence analysis, PCR and in situ hybridization. In addition, mutations may affect protein expression, so Northern blotting and Western blotting can be used to indirectly determine whether a gene is mutated. The sequences of the invention are also valuable for chromosome identification. The sequence specifically targets 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, PCR primers (preferably 15-35bp) are prepared based on cDNA, 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 Manual of Basic Techniques, Pergamon Press, 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, for example, V. Mckusick, Mendel ian Inheritance 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 have been mapped to chromosomal regions.

 Next, 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. These carriers 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 that 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. Along with 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. 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 peroxidase 11 is administered in an amount effective to treat and / or prevent a specific indication. The amount and range of human peroxidase 11 to be 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.

Claims

Request for Rights

I. An isolated polypeptide-human peroxidase 11, 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) encoding a polypeptide having the amino acid sequence shown in SEQ ID NO: 2 or a fragment thereof, or an analog thereof; Polynucleotides of derivatives;

 (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 represented by SEQ ID NO: 2.

 6. The polynucleotide according to claim 4, characterized in that the sequence of said polynucleotide comprises the sequence of positions 793-1095 in SEQ ID NO: 1 or the sequence of positions 1-1712 in SEQ ID NO: 1 .

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

 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 a polynucleotide according to any one of claims 4-6.

 9. A method for preparing a polypeptide having human peroxidase 11 activity, characterized in that the method includes:

(a) culturing the engineered host cell according to claim 8 under the condition of expressing human peroxidase 11;

(b) Isolating a polypeptide having human peroxidase 11 activity from the culture.

 10. An antibody capable of binding to a polypeptide, characterized in that said antibody is an antibody capable of specifically binding to human peroxidase 11.

II. 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 peroxidase 11.

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

 13. An application of the compound according to claim 11, characterized in that the compound is used for a method for regulating the activity of human peroxidase 11 in vivo and in vitro.

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

15. Use of a polypeptide according to any one of claims 1-3, characterized in that it is used for screening mimetics, agonists, antagonists or inhibitors of human peroxidase 11; or for peptide fingerprinting Atlas identification.

 16. The use of a nucleic acid molecule according to any one of claims 4-6, 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. Use of a polypeptide, polynucleotide or compound according to any one of claims 1-6 and 11, characterized in that the polypeptide, polynucleotide or mimetic, agonist, antagonist is used Or the 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 peroxidase 11 abnormality.

 18. Use of a polypeptide, polynucleotide or compound according to any one of claims 1-6 and 11, characterized in that said polypeptide, polynucleotide or compound is used for preparing for treating malignant tumors, blood, etc. Disease, HIV infection and immune diseases and drugs of various inflammations.