WO2001038524A1 - Nouveau polypeptide, proteine humaine 21 fixatrice de calcium, de la famille s100, et polynucleotide codant pour ledit polypeptide - Google Patents

Nouveau polypeptide, proteine humaine 21 fixatrice de calcium, de la famille s100, et polynucleotide codant pour ledit polypeptide Download PDF

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WO2001038524A1
WO2001038524A1 PCT/CN2000/000462 CN0000462W WO0138524A1 WO 2001038524 A1 WO2001038524 A1 WO 2001038524A1 CN 0000462 W CN0000462 W CN 0000462W WO 0138524 A1 WO0138524 A1 WO 0138524A1
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polypeptide
protein
polynucleotide
binding
human calcium
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PCT/CN2000/000462
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English (en)
French (fr)
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Yumin Mao
Yi Xie
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Biodoor Gene Technology Ltd.Shanghai
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Priority to AU15108/01A priority Critical patent/AU1510801A/en
Publication of WO2001038524A1 publication Critical patent/WO2001038524A1/zh

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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07KPEPTIDES
    • C07K14/00Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/435Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
    • C07K14/46Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates
    • C07K14/47Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals
    • C07K14/4701Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals not used
    • C07K14/4728Calcium binding proteins, e.g. calmodulin
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61KPREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00Medicinal preparations containing peptides

Definitions

  • the present invention belongs to the field of biotechnology. Specifically, the present invention describes a new polypeptide, human calcium-binding S 100 protein 21, and a polynucleotide sequence encoding the polypeptide. The invention also relates to a method and application for preparing the polynucleotide and polypeptide. current technology
  • EF-hand This type of domain contains a loop of 12 amino acid residues, and this loop extends to both sides through an ⁇ -helix region of 12 amino acid residues at an angle of about 90 degrees.
  • calcium ions bind to a pentagonal double-cone conformation.
  • the 6 residues involved in binding are at positions 1, 3, 5, 7, 9 and 12.
  • a conservative Glu or Asp at the 12-position provides two oxygen atoms (bi-ligand ligands) coordinated to Ca.
  • Intracellular calcium-binding protein is a key molecule in calcium signal transmission through enzyme reaction or protein-protein interaction regulation. Some of them act in the cell cycle or in cell differentiation. After being stimulated by a second signal molecule (such as inositol triphosphate), they are temporarily released from the endoplasmic reticulum into the surrounding cytoplasm. A similar process occurs in nuclear membrane rupture and chromatid separation in the later stages of mitosis.
  • S 100 protein is a group of dimer acid calcium binding protein with small molecular weight (about 10-12KD), which is abundant in the brain. It was named because the first isolated protein was soluble in 100% ammonium sulfate. The most outstanding feature of these proteins is the presence of EF-hand.
  • the S 100 protein has one calcium-binding region: one is a basic helix-one-loop-one-helix region with low affinity, and the other is an acidic helix-one-loop-one-helix EF-hand region.
  • the EF-hand region also contains part of a region that specifically identifies the S 100 family, which has a high affinity for calcium ions.
  • the S 100 protein is produced and secreted by glial cells in the central and peripheral nervous systems.
  • the accumulation of S 100 in mature glial cells is related to microtubule action.
  • S 100 promotes neural differentiation and survival, but if expressed in excess, it may be harmful to cells.
  • Selective overproduction is associated with changing progression of Alzheimer's disease and may involve mitotic protein kinases.
  • T-cell leukemia is a mature T-cell leukemia caused by human T-cell virus type I Sex tumor.
  • Decreased surface expression of T cell receptor ⁇ ⁇ complex (TCR. ⁇ .. ⁇ +) is a characteristic characteristic of patients with ATL.
  • S100 protein was expressed in the middle of CD4 +, TCR. ⁇ .. ⁇ + ATL cells, but was expressed in CD4-, CD8-, TCR. ⁇ .. ⁇ + leukocytes in four ATL patients. This indicates that the increase of S100 is related to the decrease of the TCR. ⁇ .. ⁇ + complex surface expression of ATL.
  • S100 serum levels is associated with scattered malignant melanoma metastases. This indicates that the amount of serum S100 can be used as a diagnostic marker for the process of metastatic melanoma.
  • mRNA encoding human calgizzarin (a S100-like protein) and those encoding phosphatase increased in colorectal cancer, suggesting that S100 is related to the mechanism of these cancers.
  • the human S100 protein and nucleotides encoding the same can be used to diagnose, prevent and treat neurological, vesicle trafficking, immune and tumor disorders. According to the amino acid sequence homology comparison, it was found that the polypeptide of the present invention has the characteristic sequence of the S100 gene family, especially the characteristic sequence of EF-hand. It can be inferred that the polypeptide of the present invention belongs to the S100 gene family and is named human calcium-binding S100 protein 21, which has Similar structure and function of the S100 gene family. Disclosure of invention
  • Another object of the invention is to provide a polynucleotide encoding the polypeptide.
  • Another object of the present invention is to provide a genetically engineered host cell containing a polynucleotide encoding a human calcium-binding S100 protein 21.
  • Another object of the present invention is to provide a method for producing human calcium-binding S100 protein 21.
  • Another object of the present invention is to provide an antibody against the polypeptide of the present invention-human calcium-binding S100 protein 21.
  • Another object of the present invention is to provide mimetic compounds, antagonists, agonists, and inhibitors of the polypeptide of the present invention-human calcium-binding S100 protein 21.
  • Another object of the present invention is to provide a method for diagnosing and treating diseases associated with abnormalities of human calcium-binding S100 protein 21.
  • a novel isolated human calcium-binding S100 protein 21 is provided.
  • the polypeptide is of human origin and comprises: a polypeptide having the amino acid sequence of SEQ ID NO: 2, or a conservative variant polypeptide thereof, Or its active fragment, or its active derivative, analog.
  • the polypeptide is a polypeptide having the amino acid sequence of SEQ ID NO: 2.
  • a polynucleotide encoding these isolated polypeptides, the polynucleotide comprising a nucleotide sequence having at least 70 nucleotides with a nucleotide sequence selected from the group consisting of % Identity: (a) a polynucleotide encoding the above-mentioned human calcium-binding S100 protein 21; (b) a polynucleotide complementary to the polynucleotide (a).
  • the polynucleotide encodes a polypeptide having the amino acid sequence shown in SEQ ID NO: 2.
  • sequence of the polynucleotide is one selected from the group consisting of: (a) a sequence having positions 365-946 in SEQ ID NO: 1; and (b) having a sequence of 1-3507 in SEQ ID NO: 1 Sequence of bits.
  • isolated refers to the separation of a substance from its original environment (if it is a natural substance, the original environment is the natural environment).
  • polynucleotides and polypeptides in a natural state in a living cell are not isolated and purified, but the same polynucleotides or polypeptides are separated and purified if they are separated from other substances existing in the natural state. .
  • isolated human calcium-binding S100 protein 21 means that human calcium-binding S 100 protein 21 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 calcium-binding S 100 protein 21 using standard protein purification techniques. Substantially pure polypeptides can produce a single main band on a non-reducing polyacrylamide gel. The purity of human calcium-binding S100 protein 21 peptide can be analyzed by amino acid sequence analysis.
  • the present invention provides a new polypeptide, human calcium-binding S100 protein 21, 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 may be naturally purified products or chemically synthesized products, or produced using recombinant techniques from prokaryotic or eukaryotic hosts (eg, bacteria, yeast, higher plants, insects, and mammalian cells). Depending on the host used in the recombinant production protocol, the polypeptide of the invention may be glycosylated, or it may be non-glycosylated. Polypeptides of the invention may also include or exclude starting methionine residues.
  • the invention also includes fragments, derivatives and analogs of human calcium-binding S 100 protein 21.
  • fragment refers to a polypeptide that substantially maintains the same biological function or activity of the human calcium-binding S100 protein 21 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 Amino acids may or may not be Encoded by the genetic codon; or (II) such a type in which a group on one or more amino acid residues is substituted with another group to include a substituent; or (I ⁇ ) such a type in which the mature polypeptide Fusion with another compound (such as a compound that extends the half-life of a polypeptide, such as polyethylene glycol); or (IV) a polypeptide sequence (such as a leader sequence or a secretion sequence) formed by fusing an additional amino acid sequence into a mature polypeptide Or the sequence used to purify this polypeptide or protease sequence)
  • such fragments, derivatives and analogs are considered to be within the knowledge of those skilled in the art.
  • the present invention provides an isolated nucleic acid (polynucleotide), which basically consists of a polynucleotide encoding a polypeptide having the amino acid sequence of SEQ ID NO: 2.
  • the polynucleotide sequence of the present invention includes a nucleotide sequence of SEQ ID NO: 1.
  • the polynucleotide of the present invention is found from a cDNA library of human fetal brain tissue. It contains a polynucleotide sequence of 3507 bases in length and its open reading frame (365-946) encodes 193 amino acids.
  • this polypeptide has 99% homology with the homologous protein cadherin, and it can be deduced that the human calcium-binding S 100 protein 21 has a similar structure and function to the homologous protein cadherin.
  • the polynucleotide of the present invention may be in the form of DNA 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 the mature polypeptide may be the same as the coding region sequence shown in SEQ ID NO: 1 or a degenerate variant.
  • a "degenerate variant" refers to a nucleic acid sequence encoding a protein or polypeptide having SEQ ID NO: 2 but different from the coding region sequence shown in SEQ ID NO: 1 in the present invention.
  • the polynucleotide encoding the mature polypeptide of SEQ ID NO: 2 includes: only the coding sequence of the mature polypeptide; the coding sequence of the mature polypeptide and various additional coding sequences; the coding sequence of the mature polypeptide (and optional additional coding sequences); Coding sequence.
  • polynucleotide encoding a polypeptide refers to a polynucleotide that includes the polypeptide and a polynucleotide that includes additional coding and / or non-coding sequences.
  • the invention also relates to variants of the polynucleotides described above, which encode polypeptides or fragments, analogs and derivatives of polypeptides having the same amino acid sequence as the invention.
  • This polynucleotide variant can be a naturally occurring allelic variant or a non-naturally occurring variant.
  • These nucleotide variants include substitution variants, deletion variants, and insertion variants.
  • an allelic variant is an alternative form of a polynucleotide that may be a substitution, deletion, or insertion of one or more nucleotides, but does not substantially change the function of the polypeptide it encodes .
  • the invention also relates to a polynucleotide that hybridizes to the sequence described above (having at least 50%, preferably 70% identity between the two sequences).
  • the invention particularly relates to polynucleotides that can hybridize to the polynucleotides of the invention under stringent conditions.
  • “strict conditions” means: (1) hybridization and elution at lower ionic strength and higher temperature, such as 0.2 xSSC, 0.1% SDS, 6 (TC; or (2) Adding changes when crossing Sex agent, such as 50% (v / v) formamide, 0.1% calf serum / 0.1% Ficoll, 42 ° C, etc .; or (3) the identity between the two sequences is at least 95% It is better to cross at least 97%.
  • the polypeptide encoded by the hybridizable polynucleotide has the same biological function and activity as the mature polypeptide shown in SEQ ID NO: 2.
  • nucleic acid fragments that hybridize to the sequences described above.
  • a "nucleic acid fragment” contains at least 10 nucleotides in length, preferably at least 20-30 nucleotides, more preferably at least 50-60 nucleotides, and most preferably at least 100 cores. Glycylic acid or more. Nucleic acid fragments can also be used in nucleic acid amplification techniques, such as PCR, to identify and / or isolate polynucleotides encoding human calcium-binding S100 protein 21.
  • 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 calcium-binding S100 protein 21 of the present invention can be obtained by various methods.
  • polynucleotides are isolated using hybridization techniques well known in the art. These techniques include, but are not limited to: 1) hybridization of probes to genomic or cDNA libraries to detect homologous polynucleotide sequences, and 2) antibody screening of expression libraries to detect cloned polynucleosides with common structural characteristics Acid fragments.
  • the DNA fragment sequence of the present invention can also be obtained by the following methods: 1) isolating the double-stranded DNA sequence from the genomic DNA; 2) chemically synthesizing the DNA sequence to obtain the double-stranded DNA of the polypeptide.
  • genomic DNA isolation is the least commonly used. Direct chemical synthesis of DNA sequences is often the method of choice. The more commonly used method is the isolation of cDNA sequences.
  • the standard method for isolating the cDNA of interest is to isolate mRNA from donor cells that overexpress the gene and perform reverse transcription to form a plasmid or phage cDNA library.
  • Various methods have been developed for mRNA extraction, and kits are also commercially available (Qiagene).
  • the construction of cDNA libraries is also a common method (Sambrook, et al., Molecular Cloning, A Laboratory Manual, Cold Spring Harbor Laboratory. New York, 1989).
  • Commercially available cDNA libraries are also available, such as different cDNA libraries from Clontech. When combined with polymerase reaction technology, even very small expression products can be cloned.
  • genes of the present invention can be selected from these cDNA libraries by conventional methods. These methods include (but are not limited to): (l) DNA-DNA or DNA-RM hybridization; (2) the presence or absence of marker gene functions; (3) determining the level of human calcium-binding S100 protein 21 transcripts; (4) ) Detection of protein products expressed by genes through immunological techniques or determination of biological activity. The above methods can be used singly or in combination.
  • the probe used for hybridization is homologous to any part of the polynucleotide of the present invention, and its length is at least 10 nucleotides, preferably at least 30 nucleotides, more preferably At least 50 nucleotides, preferably at least 100 nucleotides.
  • the length of the probe is usually within 2000 nucleotides, preferably within 1000 nucleotides.
  • the probe used here is usually a DNA sequence chemically synthesized based on the gene sequence information of the present invention.
  • the genes or fragments of the present invention can of course be used as probes.
  • DNA probes can be labeled with radioisotopes, luciferin, or enzymes (such as alkaline phosphatase).
  • immunological techniques such as Western blotting, radioimmunoprecipitation, and enzyme-linked immunosorbent assay (ELISA) can be used to detect the protein product of human calcium-binding S100 protein 21 gene expression.
  • a method of applying a PCR technique to amplify DNA / RNA is preferably used to obtain the gene of the present invention.
  • the RACE method RACE-rapid cDNA end rapid amplification method
  • the primers 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.
  • 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, and a host cell produced by genetic engineering using the vector of the present invention or directly using human calcium-binding S100 protein 21 coding sequence, and a method for producing the polypeptide of the present invention by recombinant technology .
  • a polynucleotide sequence encoding human calcium-binding S100 protein 21 can be inserted into a vector to form a recombinant vector containing the polynucleotide of the present invention.
  • vector refers to bacterial plasmids, bacteriophages, 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.
  • 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.
  • the expression vector also includes a ribosome binding site for translation initiation and transfection. Record terminator and so on. Insertion of enhancer sequences into the vector will enhance its transcription in higher eukaryotic cells. Enhancers are cis-acting factors expressed by DM, usually about 10 to 300 base pairs, which act on promoters to enhance gene transcription. Examples include the SV40 enhancer in the range of 1 oo to base pairs on the late side of the origin of replication, the polyoma enhancer and the adenovirus enhancer in the late side of the origin of replication.
  • the expression vector preferably contains one or more selectable marker genes to provide phenotypic traits for selection of transformed host cells, such as dihydrofolate reductase, neomycin resistance, and green for eukaryotic cell culture.
  • selectable marker genes to provide phenotypic traits for selection of transformed host cells, such as dihydrofolate reductase, neomycin resistance, and green for eukaryotic cell culture.
  • GFP fluorescent protein
  • tetracycline or ampicillin resistance for E. coli.
  • a polynucleotide encoding human calcium-binding S100 protein 21 or a recombinant vector containing the polynucleotide can be transformed or transduced into a host cell to constitute a genetically engineered host cell containing the polynucleotide or the recombinant vector.
  • the term "host cell” refers to a prokaryotic cell, such as a bacterial cell; or a lower eukaryotic cell, such as a yeast cell; or a higher eukaryotic cell, such as a mammalian cell. Representative examples are: E.
  • coli Streptomyces
  • bacterial cells such as Salmonella typhimurium
  • fungal cells such as yeast
  • plant cells insect cells
  • Drosophila S2 or Sf 9 animal cells
  • animal cells such as CH0, COS or Bowes melanoma cells.
  • Transformation of a host cell with a DNA sequence described in the present invention or a recombinant vector containing the DNA sequence can be performed using conventional techniques well known to those skilled in the art.
  • the host is a prokaryote such as E. coli
  • competent cells capable of DNA uptake can be in the exponential growth phase were harvested, treated with (Method 12, using the procedure well known in the art.
  • Alternative is MgC l 2.
  • transformation can also be performed by electroporation.
  • the following DNA transfection methods can be used: calcium phosphate co-precipitation method, or conventional mechanical methods such as microinjection, electroporation, and liposomes Packaging, etc.
  • polynucleotide sequence of the present invention can be used to express or produce recombinant human calcium-binding S100 protein 21 (Scence, 1984; 224: 1431). Generally there are the following steps:
  • the medium used in the culture may be selected from various conventional mediums. Culture is performed under conditions suitable for host cell growth. After the host cells have grown to an appropriate cell density, the selected promoter is induced by a suitable method (such as temperature conversion or chemical induction), and the cells are cultured for a period of time.
  • a suitable method such as temperature conversion or chemical induction
  • the recombinant polypeptide may be coated in a cell, expressed on a cell membrane, or secreted into a cell. Extracellular.
  • recombinant proteins can be isolated and purified by various separation methods using their physical, chemical, and other properties. These methods are well known to those skilled in the art. These methods include, but are not limited to: conventional renaturation treatment, protein precipitant treatment (salting out method), centrifugation, osmotic disruption, ultrasonic treatment, ultracentrifugation, molecular sieve chromatography (gel filtration), adsorption chromatography, ion Exchange chromatography, high performance liquid chromatography (HPLC) and various other liquid chromatography techniques and combinations of these methods.
  • conventional renaturation treatment protein precipitant treatment (salting out method), centrifugation, osmotic disruption, ultrasonic treatment, ultracentrifugation, molecular sieve chromatography (gel filtration), adsorption chromatography, ion Exchange chromatography, high
  • Figure 1 is a comparison diagram of the amino acid sequence homology of the human calcium-binding S100 protein 21 and the homologous protein neurocalcin of the present invention.
  • the upper sequence is human calcium-binding S100 protein 21, and the lower sequence is homologous protein neurocalcin.
  • Identical amino acids are represented by single-character amino acids between the two sequences, and similar amino acids are represented by "+”.
  • Figure 2 shows the polyacrylamide gel electrophoresis (SDS-PAGE) of isolated human calcium-bound S100 protein 21.
  • 21 kDa is the molecular weight of the protein.
  • the arrow indicates the isolated protein band.
  • Total human fetal brain RNA was extracted by one-step method with guanidine isothiocyanate / phenol / chloroform.
  • Poly (A) mRNA was isolated from total RNA using Quik mRNA Isolation Kit (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 DH5 cc. The bacteria formed a cDNA library.
  • Dye terminate cycle react ion sequencing kit Perkin-Elmer
  • ABI 377 automatic sequencer Perkin-Elmer
  • 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 0589 was new DNA.
  • a series of primers were synthesized to determine the inserted cDNA fragments of the clone in both directions.
  • CDNA was synthesized using fetal brain total RNA as a template and oligo-dT as a primer for reverse transcription reaction. After purification using Qiagene's kit, PCR was performed using the following primers:
  • Primerl 5'- ACGGCTGCGAGAAGACGAAGCTT -3 '(SEQ ID NO: 3)
  • Primer2 5 — AAGCCACTTTATTCCAGTCCCTT _3, (SEQ ID NO: 4)
  • Primerl is a forward sequence starting at lbp of the 5th end of SEQ ID NO: 1;
  • Primer2 is the 3 'end reverse sequence in SEQ ID NO: 1.
  • Conditions for the amplification reaction 50 mmol / L KC1, 10 mraol / L Tris-Cl, (pH 8.5), 1.5 mmol / L MgCl 2 , 200 ⁇ mol / L dNTP, lOpraol primer, 1U of Taq DNA polymerase (Clontech).
  • the reaction was performed on a PE9600 DM thermal cycler (Perkin-Elmer) under the following conditions for 25 cycles: 4 ° C 30sec; 55 ° C 30sec; 72 ° C 2min.
  • ⁇ -act in was set as a positive control and template blank was set as a negative control.
  • RNA extraction in one step 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 ), Mix and centrifuge. 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.
  • RNA was synthesized by electrophoresis on a 1.2% agarose gel containing 20 mM 3- (N-morpholino) propanesulfonic acid ( ⁇ 0) -5 mM sodium acetate-IraM EDTA-2.2M formaldehyde. Then turn Move onto nitrocellulose membrane. Cx- 32 P dATP with 32 P- DM labeled probe prepared by random priming method. The DNA probe used was the PCR-amplified human calcium-binding S100 protein 21 coding region sequence (365bp to 946bp) shown in FIG. 1.
  • Primer3 5'- CCCCATATGATGGGGAAACAGAACAGCAAGCTG -3, (Seq ID No: 5)
  • Primer4 5'- CCCGGATCCAATTCGATTGGTGGGCGCAGGGCT -3 '(Seq ID No: 6)
  • the two ends of these two primers contain Ndel and BamHI restriction sites, respectively.
  • the coding sequences of the 5 'and 3' ends of the gene of interest are followed, respectively.
  • the Ndel and BamHI restriction sites correspond to the selectivity within the expression vector plasmid pET-28b (+) (Novagen, Cat. No. 69865.3). Digestion site.
  • a pBS-0589 plasmid containing a full-length gene was used as a template for PCR.
  • the PCR reaction conditions were as follows: a total volume of 50 ⁇ containing pBS-0589 plasmid 10 pg, primers Primer-3 and Primer-4 were 10 pmol, Advantage polymerase Mix (Clontech) 1 ⁇ 1 respectively. Cycle parameters: 94. C 20s, 60 ° C 30s, 68 ° C 2 min, a total of 25 cycles. Ndel and BamHI were used to double digest the amplified product and plasmid pET-28 (+), respectively, and large fragments were recovered and ligated with T4 ligase. The ligation product was transformed into E.
  • the polypeptide is coupled to hemocyanin and bovine serum albumin to form a complex, respectively.
  • hemocyanin and bovine serum albumin For the method, see: Avrameas, et al. Immunochemi s try, 1969; 6: 43. Rabbits were immunized with 4 mg of the hemocyanin polypeptide complex plus complete Freund's adjuvant, and 15 days later, the hemocyanin polypeptide complex plus incomplete Freund's adjuvant was used to boost immunity once. 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. Total IgG was isolated from antibody-positive rabbit serum using protein A-Sepharose.
  • the peptide was bound to a cyanogen bromide-activated Se P harose 4B column, and anti-peptide antibodies were separated from the total IgG by affinity chromatography.
  • the immunoprecipitation method proved that the purified antibody could specifically bind to human calcium-binding S100 protein 21.
  • sioo involves neurological disorders. Such conditions include, but are not limited to, sitting still, Alzheimer's disease, amnesia, amyotrophic sclerosis, bipolar cell disorder, tension, brain neoplasms, dementia, depression, Down syndrome, tardive voluntary movement disorder, tension Disorders, epilepsy, Huntington's disease, complex sclerosis, neurofibromas, Parkinson's disease, paranoia, schizophrenia, Tourette's disease, etc.
  • antibodies that specifically bind to S100 are used directly as antagonists, or indirectly as target substances, or involved in the mechanism of transporting drugs to cells or tissues expressing S100.
  • si oo relates to disorders related to membrane bubble transport disorders.
  • Such conditions include, but are not limited to, bladder fibrosis, glucose galactose malabsorption syndrome, hypercholesterolemia, diabetes, hypoglycemia, Graves' disease, goiter, Cushing's disease, and malignant anemia; gastrointestinal conditions include ulcerative Colitis, gastric and duodenal ulcers, other disorders related to abnormal membrane vesicle transport, including A IDS; allergic reactions including asthma and rubella, autoimmune hemolytic anemia; diffuse glomerulonephritis; enteritis, multiple sclerosis Disease, rheumatism, osteoarthritis, myasthenia gravis, scleroderma, Chediac-East syndrome; systemic lupus erythematosus, toxic shock syndrome, tissue trauma, bacterial, fungal, parasitic and protozoal infections.
  • antibodies that specifically bind to S100 can directly act as antagonists and indirectly as target substances, and participate in the transport mechanism of drugs to cells or
  • S 100 relates to disorders caused by autoimmune disorders.
  • Such conditions include, but are not limited to, AI DS, pernicious anemia, adult dyspnea syndrome, allergic reactions, anemia, asthma, periarteriosclerosis, bronchitis, cholecystitis, stage ileitis, ulcerative colitis, specific skin Inflammation, dermatomyositis, diabetes, emphysema, atrophic gastritis, glomerulonephritis, gout, Graves' disease, eosinophilia, allergic bowel syndrome, lupus erythematosus, complex sclerosis, myocardium Weakness, myocarditis, osteoarthritis, osteoporosis, pancreatitis, polymyositis, rheumatoid arthritis, scleroderma, Sjägren syndrome and autoimmune thyroiditis, cancer complications, hemodialysis and extracorporeal circulation , Bacterial
  • S100 is involved in tumorigenesis.
  • diseases include, but are not limited to, adenocarcinoma, leukemia, lymphoma, melanoma, bone marrow cancer, sarcoma, teratoma, especially the cervix, adrenal gland, bladder, bone, bone marrow, brain, chest, gallbladder, ganglia, gastrointestinal Cancer of the tract, heart, kidney, liver, lungs, muscles, ovary, pancreas, parathyroid, penis, prostate, salivary glands, skin, spleen, testes, thymus, thyroid and uterus.
  • antibodies that specifically bind to S100 can directly act as antagonists and indirectly as target substances, and participate in the transport mechanism of drugs to cells or tissues expressing S100.
  • 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.
  • the invention also provides screening compounds to identify improved (agonist) or repressed (antagonist) human calcium binding
  • Method for the preparation of S100 protein 21 Agonists enhance human calcium-binding S100 protein 21 to stimulate biological functions such as cell proliferation, while antagonists prevent and treat disorders related to excessive cell proliferation, such as various cancers.
  • mammalian cells or membrane preparations expressing human calcium-binding S100 protein 21 can be cultured together with labeled human calcium-binding S100 protein 21 in the presence of a drug. The ability of the drug to increase or block this interaction is then measured.
  • Antagonists of human calcium-binding S100 protein 21 include antibodies, compounds, receptor deletions, and the like that have been screened.
  • the antagonist of human calcium-binding S100 protein 21 can bind to human calcium-binding S100 protein 21 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.
  • human calcium-binding S100 protein 21 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 calcium-binding S100 protein 21 and its receptor. .
  • Receptor deletions and analogs that function as antagonists can be screened in the same manner as described above for screening compounds.
  • Polypeptide molecules capable of binding to human calcium-binding S100 protein 21 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 calcium-binding S100 protein 21 molecule should generally be labeled.
  • the present invention provides a method for producing an antibody using a polypeptide, a fragment, a derivative, an analog thereof, or a cell thereof as an antigen.
  • These antibodies can be polyclonal or monoclonal antibodies.
  • the invention also provides antibodies against the human calcium-binding S100 protein 21 epitope. 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 direct injection of human calcium-binding S100 protein 21 Obtained by methods of immunizing animals (such as home immunity, mice, rats, etc.), a variety of adjuvants can be used to enhance the immune response, including but not limited to Freund's Adjuvant, etc.
  • Techniques for preparing monoclonal antibodies to human calcium-binding S100 protein 21 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- Hybridoma technology, etc.
  • Chimeric antibodies combining human constant regions and non-human variable regions can be produced using existing techniques (Morrison et al, PNAS, 1985, 81: 6851). 0 Existing techniques for producing single-chain antibodies (US Pat No. .4946778) can also be used to produce single chain antibodies against human calcium-binding S100 protein 21.
  • Antibodies against human calcium-binding S100 protein 21 can be used in immunohistochemical techniques to detect human calcium-binding S100 protein 21 in biopsy specimens.
  • Monoclonal antibodies that bind to human calcium-binding S100 protein 21 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.
  • human calcium-binding S100 protein 21 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 calcium-binding S100 protein 21-positive cells .
  • the antibodies of the present invention can be used to treat or prevent diseases related to human calcium-binding S100 protein 21.
  • Administration of an appropriate dose of the antibody can stimulate or block the production or activity of human calcium-binding S100 protein 21.
  • the invention also relates to a diagnostic test method for quantitatively and locally detecting the level of human calcium-binding S100 protein 21.
  • tests are well known in the art and include FISH assays and radioimmunoassays.
  • the level of human calcium-binding S100 protein 21 detected in the test can be used to explain the importance of human calcium-binding S100 protein 21 in various diseases and to diagnose diseases in which human calcium-binding S100 protein 21 plays a role.
  • polypeptide of the present invention can also be used for peptide mapping analysis.
  • the polypeptide can be specifically cleaved by physical, chemical or enzymatic analysis, and subjected to one-dimensional or two-dimensional or three-dimensional gel electrophoresis analysis, and more preferably mass spectrometry.
  • the polynucleotide encoding human calcium-binding S100 protein 21 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 calcium-binding S100 protein 21.
  • Recombinant gene therapy vectors (such as viral vectors) can be designed to express mutated human calcium-binding S100 protein 21 to inhibit endogenous human calcium-binding S100 protein 21 activity.
  • a variant human calcium-binding S100 protein 21 may be shortened, and the human calcium-binding S100 protein 21 lacking a signaling domain, although it can bind to downstream substrates, but lacks signaling activity.
  • recombinant gene therapy vectors can be used to treat diseases caused by abnormal expression or activity of human calcium-binding S100 protein 21.
  • Virus-derived expression vectors such as retrovirus, adenovirus, adenovirus-associated virus, herpes simplex virus, parvovirus, etc. are available.
  • Construct Methods for carrying recombinant viral vectors carrying a polynucleotide encoding human calcium-binding S100 protein 21 can be found in the literature (Sambrook, et al.).
  • a recombinant polynucleotide encoding human calcium-binding S100 protein 21 can be packaged into liposomes and transferred into cells.
  • Methods for introducing a polynucleotide into a tissue or cell include: directly injecting the polynucleotide into a tissue in vivo; or introducing the polynucleotide into a cell in vitro through a vector (such as a virus, phage, or plasmid), and then transplanting the cell Into the body and so on.
  • a vector such as a virus, phage, or plasmid
  • Oligonucleotides including antisense MA and DNA
  • ribozymes that inhibit ⁇ peptide name ⁇ m NA are also within the scope of the present invention.
  • a ribozyme is an enzyme-like RNA molecule that can specifically decompose specific RNA. Its mechanism of action is that the ribozyme molecule specifically hybridizes with a complementary target RNA for endonucleation.
  • Antisense RNA, DNA, and ribozymes can be obtained using any existing RNA or DNA synthesis techniques, 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 RNA polymerase promoter of the vector.
  • it can be modified in a variety of ways, such as increasing the sequence length on both sides, and the linkage between ribonucleosides using phosphate thioester or peptide bonds instead of phosphodiester bonds.
  • the polynucleotide encoding human calcium-binding S100 protein 21 can be used for the diagnosis of diseases related to human calcium-binding S100 protein 21.
  • the polynucleotide encoding human calcium-binding S100 protein 21 can be used to detect the expression of human calcium-binding S100 protein 21 or the abnormal expression of human calcium-binding S100 protein 21 in a disease state.
  • the DM sequence encoding human calcium-binding S100 protein 21 can be used to hybridize biopsy specimens to determine the expression of human calcium-binding S100 protein 21.
  • 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.
  • polynucleotides of the present invention can be used as probes to be fixed on a microarray or a DNA chip (also known as a "gene chip") for analyzing differential expression analysis and gene diagnosis of genes in tissues.
  • Human calcium-binding S100 protein 21 specific primers can also be used to detect the human calcium-binding S100 protein 21 transcription product by RNA-polymerase chain reaction (RT-PCR) in vitro amplification.
  • RT-PCR RNA-polymerase chain reaction
  • Human calcium-binding S100 protein 21 mutations include point mutations, translocations, deletions, recombinations, and any other abnormalities compared to the normal wild-type human calcium-binding S100 protein 21 DNA sequence. 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.
  • the specific loci of each gene on the chromosome need to be identified ...
  • only few chromosome markers based on actual sequence data are available for marking chromosome positions.
  • an important first step is to locate these DNA sequences on a chromosome.
  • PCR primers (preferably 15-35bp) are prepared from the cDNA, and the sequences can be located on the chromosomes. These primers were then used for PCR screening of somatic hybrid cells containing individual human chromosomes. Only those heterozygous cells containing the human gene corresponding to the primer will produce amplified fragments.
  • PCR localization of somatic hybrid cells is a quick way to localize DNA to specific chromosomes.
  • oligonucleotide primers of the present invention in a similar manner, a set of fragments from a specific chromosome or a large number of genomic clones can be used to achieve sublocalization.
  • Other similar strategies that can be used for chromosomal localization include in situ hybridization, chromosome pre-screening with labeled flow sorting, and pre-selection of hybridization to construct chromosome-specific cDNA libraries.
  • Fluorescent in situ hybridization (FI SH) of cDNA clones with metaphase chromosomes allows precise chromosomal localization in one step.
  • FI SH Fluorescent in situ hybridization
  • 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. Mckus i ck, Mende l ian Inher i tance in Man (available online with Johns Hopk ins Un i vers i ty We lch Med i ca l L brary). Linkage analysis can then be used to determine the relationship between genes and diseases that have been mapped to chromosomal regions.
  • 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 observed in any normal individual, the mutation may be the cause of the disease. Comparing affected and unaffected individuals usually involves first looking for structural changes in chromosomes, such as deletions or translocations that are visible at the chromosomal level or detectable with cDNA sequence-based PCR. According to the resolution capabilities of current physical mapping and gene mapping technology, the cDNA accurately mapped to the chromosomal region associated with the disease can be one of 50 to 500 potentially pathogenic genes (assuming 1 megabase mapping resolution) Capacity and each 20kb corresponds to a gene).
  • the polypeptides, polynucleotides and mimetics, agonists, antagonists and inhibitors of the present invention can be used in combination with a suitable pharmaceutical carrier.
  • suitable pharmaceutical carrier can be water, glucose, ethanol, salts, buffers, glycerol, and combinations thereof.
  • the composition comprises a safe and effective amount of the polypeptide or antagonist, and carriers and excipients 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.
  • containers containing one or more ingredients of the pharmaceutical composition of the present invention.
  • the polypeptides of the present invention can be combined with other therapeutic agents. Conjugates are used in combination.
  • 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 calcium-binding S100 protein 21 is administered in an amount effective to treat and / or prevent a specific indication.
  • the amount and dose range of human calcium-binding S100 protein 21 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.

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Description

说 明 书
一种新的多肽一一人钙结合 S 100蛋白 21和编码这种多肽的多核苷酸 技术领域
本发明属于生物技术领域, 具体地说, 本发明描述了一种新的多肽一一人钙 结合 S 100蛋白 21, 以及编码此多肽的多核苷酸序列。 本发明还涉及此多核苷酸 和多肽的制备方法和应用。 现有技术
许多钙结合蛋白属于相同的进化家族, 拥有一个被称为 EF- hand 的结构域。 这种类型的结构域包含一个 12 个氨基酸残基组成的环, 这个环通过一个 12 个 氨基酸残基的 α螺旋区域向两边伸展, 约成 90度角。 在 EF- hand 环中, 钙离子 结合于一个五边形的双锥状的构象中。 涉及结合的 6个残基在 1, 3, 5, 7, 9和 12位。 12位上保守的 G l u或 Asp提供与 Ca配位的两个氧原子(双配位基配体)。
细胞液中钙离子浓度的变化引起了广泛的细胞反应。 细胞内的钙结合蛋白是 通过酶反应或蛋白一一蛋白相互作用调节来传导钙信号中的关键分子。 它们中的 一些在细胞周期中作用, 或作用于细胞分化。 被第二信号分子 (如肌醇三磷酸) 刺激后, 它们短暂地从内质网释放到周围的细胞质中。 相似的过程在核膜破裂和 有丝分裂后期的染色单体分离中发生。
S 1 00蛋白是一群小分子量 (约 10- 12KD ) 的二聚的酸性钙结合蛋白, 在脑中 很丰富。 由于第一个分离的蛋白在 1 00%硫酸铵中可溶而得名。 这些蛋白最出众 的特征是 EF- hand 的存在。 S 1 00 蛋白有 1 个钙结合区域: 一个是基本的螺旋一 一环一一螺旋区域, 有低亲和力, 另一个是酸性的螺旋一一环一一螺旋 EF- hand 区域。 EF-hand 区域还包含了特异性鉴别 S 100 家族的区域的一部分, 它与钙离 子有高亲和性。
至今, 这些蛋白中没有发现任何特异的酶活性质。 在 S 100 蛋白中, 钙的结 合导致了构象的改变, 从而影响了二级作用蛋白。 S 100 蛋白参与一个类型专一 性的模式中的细胞内钙增加的信号传导。
S 1 00 蛋白在中央和周围神经系统中由胶质细胞产生和分泌。 在成熟胶质细 胞中 S 1 00 的积累与微管作用有关。 S 100推动了神经分化和生存, 但如果过量表 达, 可能对细胞有害。 选择性的过量产生与老年痴呆症的变化进展有关, 可能涉 及有丝分裂蛋白激酶。
成人 T细胞白血病 ( ATL ) 是由人 T 巴细胞病毒 I 型导致的成熟 T细胞恶 性肿瘤。 T细胞受体 αβ复合体 (TCR. α.. β+) 表面表达减少是 ATL患者特异的特 征。 S100蛋白在 CD4+, TCR. α.. β+ATL 细胞中部表达, 但在四个 ATL 患者中的 CD4-, CD8-, TCR. α.. β+白细胞中表达。 这表明 S100的增加与 ATL的 TCR. α.. β+ 复合体表面表达减少有关。
S100血清水平的提高与分散的恶性黑素瘤转移有关。 这表明血清 S100 的量 可作为转移黑素瘤进程的诊断标志。 另外, 编码人 calgizzarin (—种 S100 类似 蛋白)的 mRNA以及那些编码磷酯酶的 mRNA在结肠直肠癌中增加, 表明 S100与这 些癌的机制有关。
人 S100蛋白和编码其的核苷酸可用于诊断、 预防和治疗神经, 膜泡运输, 免 疫和瘤的病症。 根据氨基酸序列同源比较发现, 本发明的多肽具有 S100 基因家族的特征序 列, 特别是 EF- hand 的特征序列, 可推断出本发明的多肽属于 S100 基因家族, 命名为人钙结合 S100蛋白 21, 具有 S100基因家族相似的结构和功能。 发明的公开
本发明的一个目的是提供分离的新的多肽一一人钙结合 S100 蛋白 21 以及其 片段、 类似物和衍生物。
本发明的另一个目的是提供编码该多肽的多核苷酸。
本发明的另一个目的是提供含有编码人钙结合 S100 蛋白 21 的多核苷酸的重 组载体。
本发明的另一个目的是提供含有编码人钙结合 S100 蛋白 21 的多核苷酸的基 因工程化宿主细胞。
本发明的另一个目的是提供生产人钙结合 S100蛋白 21的方法。
本发明的另一个目的是提供针对本发明的多肽一一人钙结合 S100 蛋白 21 的 抗体。
本发明的另一个目的是提供了针对本发明多肽一一人钙结合 S100 蛋白 21 的 模拟化合物、 拮抗剂、 激动剂、 抑制剂。
本发明的另一个目的是提供诊断治疗与人钙结合 S100 蛋白 21 异常相关的疾 病的方法。 在本发明的第一方面, 提供新颖的分离出的人钙结合 S100蛋白 21, 该多肽是 人源的, 它包含: 具有 SEQ ID NO: 2 氨基酸序列的多肽、 或其保守性变异多肽、 或其活性片段、 或其活性衍生物、 类似物。 较佳地, 该多肽是具有 SEQ ID NO: 2 氨基酸序列的多肽。
在本发明的第二方面, 提供编码分离的这些多肽的多核苷酸, 该多核苷酸包 含一核苷酸序列, 该核苷酸序列与选自下组的一种核苷酸序列有至少 70%相同性: (a)编码上述人钙结合 S100蛋白 21 的多核苷酸; (b)与多核苷酸(a)互补的多核 苷酸。 较佳地, 该多核苷酸编码具有 SEQ ID NO: 2 所示氨基酸序列的多肽。 更佳 地, 该多核苷酸的序列是选自下组的一种: (a)具有 SEQ ID NO: 1 中 365-946 位 的序列; 和(b)具有 SEQ ID NO: 1 中 1 - 3507位的序列。
在本发明的第三方面, 提供了含有上述多核苷酸的载体, 以及被该载体转化 或转导的宿主细胞或者被上述多核苷酸直接转化或转导的宿主细胞。
本发明的其它方面由于本文的技术的公开, 对本领域的技术人员而言是显而易 见的。 如本发明所用, "分离的" 是指物质从其原始环境中分离出来 (如果是天然 的物质, 原始环境即是天然环境) 。 如活体细胞内的天然状态下的多聚核苷酸和 多肽是没有分离纯化的, 但同样的多聚核苷酸或多肽如从天然状态中同存在的其 他物质中分开, 则为分离纯化的。
如本文所用, "分离的人钙结合 S100 蛋白 21 " 是指人钙结合 S 100蛋白 21 基本上不含天然与其相关的其它蛋白、 脂类、 糖类或其它物质。 本领域的技术人 员能用标准的蛋白质纯化技术纯化人钙结合 S 100 蛋白 21。 基本上纯的多肽在非 还原聚丙烯酰胺凝胶上能产生单一的主带。 人钙结合 S100蛋白 21 多肽的纯度能 用氨基酸序列分析。
本发明提供了一种新的多肽一一人钙结合 S100蛋白 21, 其基本上是由 SEQ ID NO: 2所示的氨基酸序列组成的。 本发明的多肽可以是重组多肽、 天然多肽、 合成多 肽, 优选重组多肽。 本发明的多肽可以是天然纯化的产物, 或是化学合成的产物, 或使用重组技术从原核或真核宿主(例如, 细菌、 酵母、 高等植物、 昆虫和哺乳动 物细胞)中产生。 根据重组生产方案所用的宿主, 本发明的多肽可以是糖基化的, 或可以是非糖基化的。 本发明的多肽还可包括或不包括起始的甲硫氨酸残基。
本发明还包括人钙结合 S 100蛋白 21 的片段、 衍生物和类似物。 如本发明所 用, 术语 "片段" 、 "衍生物" 和 "类似物" 是指基本上保持本发明的人钙结合 S 100 蛋白 21 相同的生物学功能或活性的多肽。 本发明多肽的片段、 衍生物或类 似物可以是: ( I ) 这样一种, 其中一个或多个氨基酸残基被保守或非保守氨基 酸残基 (优选的是保守氨基酸残基) 取代, 并且取代的氨基酸可以是也可以不是 由遗传密码子编码的; 或者 ( I I ) 这样一种, 其中一个或多个氨基酸残基上的某 个基团被其它基团取代包含取代基; 或者 ( Ι Π ) 这样一种, 其中成熟多肽与另 一种化合物 (比如延长多肽半衰期的化合物, 例如聚乙二醇) 融合; 或者 ( I V ) 这样一种, 其中附加的氨基酸序列融合进成熟多肽而形成的多肽序列 (如前导序 列或分泌序列或用来纯化此多肽的序列或蛋白原序列) 通过本文的阐述, 这样的 片段、 衍生物和类似物被认为在本领域技术人员的知识范围之内。
本发明提供了分离的核酸 (多核苷酸) , 基本由编码具有 SEQ ID NO: 2 氨 基酸序列的多肽的多核苷酸组成。 本发明的多核苷酸序列包括 SEQ ID N0: 1 的核 苷酸序列。 本发明的多核苷酸是从人胎脑组织的 cDNA 文库中发现的。 它包含的 多核苷酸序列全长为 3507个碱基, 其开放读框 ( 365-946 ) 编码了 193氨基酸。 根据氨基酸序列同源比较发现, 此多肽与同源蛋白神经钙蛋白有 99%的同源性, 可推断出该人钙结合 S 100蛋白 21具有同源蛋白神经钙蛋白相似的结构和功能。
本发明的多核苷酸可以是 DNA形式或是 RNA形式。 DM形式包括 cDNA、 基因 组 DNA 或人工合成的 DNA。 DNA 可以是单链的或是双链的。 DNA 可以是编码链或 非编码链。 编码成熟多肽的编码区序列可以与 SEQ ID NO: 1所示的编码区序列相 同或者是简并的变异体。 如本发明所用, "简并的变异体" 在本发明中是指编码 具有 SEQ ID NO: 2 的蛋白质或多肽, 但与 SEQ ID NO: 1所示的编码区序列有差别 的核酸序列。
编码 SEQ ID NO: 2 的成熟多肽的多核苷酸包括: 只有成熟多肽的编码序列; 成熟多肽的编码序列和各种附加编码序列; 成熟多肽的编码序列 (和任选的附加 编码序列) 以及非编码序列。
术语 "编码多肽的多核苷酸" 是指包括编码此多肽的多核苷酸和包括附加编 码和 /或非编码序列的多核苷酸。
本发明还涉及上述描述多核苷酸的变异体, 其编码与本发明有相同的氨基酸 序列的多肽或多肽的片断、 类似物和衍生物。 此多核苷酸的变异体可以是天然发 生的等位变异体或非天然发生的变异体。 这些核苷酸变异体包括取代变异体、 缺 失变异体和插入变异体。 如本领域所知的, 等位变异体是一个多核苷酸的替换形 式, 它可能是一个或多个核苷酸的取代、 缺失或插入, 但不会从实质上改变其编 码的多肽的功能。
本发明还涉及与以上所描述的序列杂交的多核苷酸 (两个序列之间具有至少 50% , 优选具有 70%的相同性) 。 本发明特别涉及在严格条件下与本发明所述多 核苷酸可杂交的多核苷酸。 在本发明中, "严格条件" 是指: (1)在较低离子强 度和较高温度下的杂交和洗脱, 如 0. 2 xSSC, 0. 1%SDS, 6 (TC ;或(2)杂交时加用变 性剂, 如 50%(v/v)甲酰胺, 0.1%小牛血清 /0. l%Ficoll, 42°C等; 或(3)仅在两 条序列之间的相同性至少在 95%以上,更好是 97%以上时才发生杂交。 并且, 可杂 交的多核苷酸编码的多肽与 SEQ ID NO: 2 所示的成熟多肽有相同的生物学功能 和活性。
本发明还涉及与以上所描述的序列杂交的核酸片段。 如本发明所用, "核酸 片段"的长度至少含 10个核苷酸, 较好是至少 20-30个核苷酸, 更好是至少 50 - 60 个核苷酸, 最好是至少 100 个核苷酸以上。 核酸片段也可用于核酸的扩增技 术(如 PCR)以确定和 /或分离编码人钙结合 S100蛋白 21的多核苷酸。
本发明中的多肽和多核苷酸优选以分离的形式提供, 更佳地被纯化至均质。 本发明的编码人钙结合 S100蛋白 21 的特异的多核苷酸序列能用多种方法获 得。 例如, 用本领域熟知的杂交技术分离多核苷酸。 这些技术包括但不局限于: 1)用探针与基因组或 cDNA 文库杂交以检出同源的多核苷酸序列, 和 2)表达文库 的抗体筛选以检出具有共同结构特征的克隆的多核苷酸片段。
本发明的 DNA 片段序列也能用下列方法获得: 1)从基因组 DNA分离双链 DNA 序列; 2)化学合成 DNA序列以获得所述多肽的双链 DNA。
上述提到的方法中, 分离基因组 DNA 最不常用。 DNA 序列的直接化学合成是 经常选用的方法。 更经常选用的方法是 cDNA序列的分离。 分离感兴趣的 cDNA 的 标准方法是从高表达该基因的供体细胞分离 mRNA 并进行逆转录, 形成质粒或噬 菌体 cDNA文库。 提取 mRNA 的方法已有多种成熟的技术, 试剂盒也可从商业途径 获得(Qiagene)。 而构建 cDNA文库也是通常的方法(Sambrook, et al. , Molecular Cloning, A Laboratory Manual, Cold Spring Harbor Laboratory. New York, 1989)。 还可得到商业供应的 cDNA文库, 如 Clontech公司的不同 cDNA文库。 当 结合使用聚合酶反应技术时, 即使极少的表达产物也能克隆。
可用常规方法从这些 cDNA 文库中筛选本发明的基因。 这些方法包括(但不限 于): (l)DNA- DNA 或 DNA- RM 杂交; (2)标志基因功能的出现或丧失; (3)测定人 钙结合 S100 蛋白 21 的转录本的水平; (4)通过免疫学技术或测定生物学活性, 来检测基因表达的蛋白产物。 上述方法可单用, 也可多种方法联合应用。
在第(1)种方法中, 杂交所用的探针是与本发明的多核苷酸的任何一部分同 源, 其长度至少 10 个核苷酸, 较好是至少 30 个核苷酸, 更好是至少 50 个核苷 酸, 最好是至少 100 个核苷酸。 此外, 探针的长度通常在 2000 个核苷酸之内, 较佳的为 1000 个核苷酸之内。 此处所用的探针通常是在本发明的基因序列信息 的基础上化学合成的 DNA 序列。 本发明的基因本身或者片段当然可以用作探针。 DNA探针的标记可用放射性同位素, 荧光素或酶(如碱性磷酸酶)等。 在第(4)种方法中, 检测人钙结合 S100 蛋白 21 基因表达的蛋白产物可用免 疫学技术如 Western印迹法, 放射免疫沉淀法, 酶联免疫吸附法(ELISA)等。
应 用 PCR 技 术 扩 增 DNA/RNA 的 方 法 (Saiki, et al. Science 1985; 230: 1350-1354)被优选用于获得本发明的基因。 特别是很难从文库中得到 全长的 cDNA时, 可优选使用 RACE法(RACE- cDNA末端快速扩增法), 用于 PCR的 引物可根据本文所公开的本发明的多核苷酸序列信息适当地选择, 并可用常规方 法合成。 可用常规方法如通过凝胶电泳分离和纯化扩增的 DNA/RNA片段。
如上所述得到的本发明的基因, 或者各种 DNA 片段等的多核苷酸序列可用常 规方法如双脱氧链终止法(Sanger et al. PNAS, 1977, 74: 5463- 5467)测定。 这类多核苷酸序列测定也可用商业测序试剂盒等。 为了获得全长的 cDNA序列, 测 序需反复进行。 有时需要测定多个克隆的 cDNA序列, 才能拼接成全长的 cDNA序 列。
本发明也涉及包含本发明的多核苷酸的载体, 以及用本发明的载体或直接用 人钙结合 S100蛋白 21 编码序列经基因工程产生的宿主细胞, 以及经重组技术产 生本发明所述多肽的方法。
本发明中, 编码人钙结合 S100蛋白 21 的多核苷酸序列可插入到载体中, 以 构成含有本发明所述多核苷酸的重组载体。 术语 "载体" 指本领域熟知的细菌质 粒、 噬菌体、 酵母质粒、 植物细胞病毒、 哺乳动物细胞病毒如腺病毒、 逆转录病 毒或其它载体。 在本发明中适用的载体包括但不限于: 在细菌中表达的基于 T7 启动子的表达载体(Rosenberg, et al. Gene, 1987, 56: 125); 在哺乳动物细胞 中表达的 pMSXND 表达载体(Lee and Nathans, J Bio Chem. 263: 3521, 1988)和 在昆虫细胞中表达的来源于杆状病毒的载体。 总之, 只要能在宿主体内复制和稳 定, 任何质粒和载体都可以用于构建重组表达载体。 表达载体的一个重要特征是 通常含有复制起始点、 启动子、 标记基因和翻译调控元件。
本领域的技术人员熟知的方法能用于构建含编码人钙结合 S100蛋白 21的 DNA 序列和合适的转录 /翻译调控元件的表达载体。 这些方法包括体外重组 DNA 技术、 DNA 合成技术、 体内重组技术等(Sambroook, et al. Molecular Cloning, a Laboratory Manual, cold Spring Harbor Laboratory. New York, 1989)。 所 述的 DNA 序列可有效连接到表达载体中的适当启动子上, 以指导 mRNA 合成。 这 些启动子的代表性例子有: 大肠杆菌的 lac 或 trp启动子; λ噬菌体的 PL 启动 子; 真核启动子包括 CMV立即早期启动子、 HSV胸苷激酶启动子、 早期和晚期 SV40 启动子、 反转录病毒的 LTRs 和其它一些已知的可控制基因在原核细胞或真核细 胞或其病毒中表达的启动子。 表达载体还包括翻译起始用的核糖体结合位点和转 录终止子等。 在载体中插入增强子序列将会使其在高等真核细胞中的转录得到增 强。 增强子是 DM表达的顺式作用因子, 通常大约有 10 到 300 个碱基对, 作用 于启动子以增强基因的转录。可举的例子包括在复制起始点晚期一侧的 l oo到 个碱基对的 SV40 增强子、 在复制起始点晚期一侧的多瘤增强子以及腺病毒增强 子等。
此外, 表达载体优选地包含一个或多个选择性标记基因, 以提供用于选择转 化的宿主细胞的表型性状, 如真核细胞培养用的二氢叶酸还原酶、 新霉素抗性以 及绿色荧光蛋白(GFP), 或用于大肠杆菌的四环素或氨苄青霉素抗性等。
本领域一般技术人员都清楚如何选择适当的载体 /转录调控元件 (如启动 子、 增强子等) 和选择性标记基因。
本发明中, 编码人钙结合 S100蛋白 21 的多核苷酸或含有该多核苷酸的重组 载体可转化或转导入宿主细胞, 以构成含有该多核苷酸或重组载体的基因工程化 宿主细胞。 术语 "宿主细胞" 指原核细胞, 如细菌细胞; 或是低等真核细胞, 如 酵母细胞; 或是高等真核细胞, 如哺乳动物细胞。 代表性例子有: 大肠杆菌, 链 霉菌属; 细菌细胞如鼠伤寒沙门氏菌; 真菌细胞如酵母; 植物细胞; 昆虫细胞如 果蝇 S2或 Sf 9 ; 动物细胞如 CH0、 COS或 Bowes黑素瘤细胞等。
用本发明所述的 DNA序列或含有所述 DNA序列的重组载体转化宿主细胞可用 本领域技术人员熟知的常规技术进行。 当宿主为原核生物如大肠杆菌时, 能吸收 DNA 的感受态细胞可在指数生长期后收获, 用 ( 12法处理, 所用的步骤在本领 域众所周知。 可供选择的是用 MgC l2。 如果需要, 转化也可用电穿孔的方法进行。 当宿主是真核生物, 可选用如下的 DNA 转染方法: 磷酸钙共沉淀法, 或者常规机 械方法如显微注射、 电穿孔、 脂质体包装等。
通过常规的重组 DM 技术, 利用本发明的多核苷酸序列可用来表达或生产重 组的人钙结合 S100蛋白 21 (Sc i ence , 1984; 224: 1431)。 一般来说有以下步骤:
(1) .用本发明的编码人 人钙结合 S 100 蛋白 21 的多核苷酸(或变异体), 或 用含有该多核苷酸的重组表达载体转化或转导合适的宿主细胞;
(2) .在合适的培养基中培养宿主细胞;
(3) .从培养基或细胞中分离、 纯化蛋白质。
在歩骤 ( 2 ) 中, 根据所用的宿主细胞, 培养中所用的培养基可选自各种常 规培养基。 在适于宿主细胞生长的条件下进行培养。 当宿主细胞生长到适当的细 胞密度后, 用合适的方法(如温度转换或化学诱导)诱导选择的启动子, 将细胞再 培养一段时间。
在步骤 ( 3 ) 中, 重组多肽可包被于细胞内、 或在细胞膜上表达、 或分泌到 细胞外。 如果需要, 可利用其物理的、 化学的和其它特性通过各种分离方法分离 和纯化重组的蛋白。 这些方法是本领域技术人员所熟知的。 这些方法包括但并不 限于: 常规的复性处理、 蛋白沉淀剂处理(盐析方法)、 离心、 渗透破菌、 超声波 处理、 超离心、 分子筛层析(凝胶过滤)、 吸附层析、 离子交换层析、 高效液相层 析(HPLC)和其它各种液相层析技术及这些方法的结合。 附图的简要说明
下列附图用于说明本发明的具体实施方案, 而不用于限定由权利要求书所 界定的本发明范围。
图 1是本发明人钙结合 S100蛋白 21和同源蛋白神经钙蛋白的氨基酸序列同源 性比较图。 上方序列是人钙结合 S100蛋白 21, 下方序列是同源蛋白神经钙蛋白。 相同氨基酸在两个序列间用单字符氨基酸表示, 相似氨基酸用 "+" 表示。
图 2为分离的人钙结合 S100蛋白 21的聚丙烯酰胺凝胶电泳图(SDS- PAGE)。 21kDa为蛋白质的分子量。 箭头所指为分离出的蛋白条带。 实现本发明的最佳方式
下面结合具体实施例, 进一步阐述本发明。 应理解, 这些实施例仅用于说明 本发明而不用于限制本发明的范围。 下列实施例中未注明具体条件的实验方法, 通常按照常规条件如 Sambrook 等人, 分子克隆: 实验室手册(New York: Cold Spring Harbor Laboratory Press, 1989)中所述的条件, 或按照制造厂商所建 议的条件。 实施例 1: 人钙结合 S100蛋白 21的克隆
用异硫氰酸胍 /酚 /氯仿一步法提取人胎脑总 RNA。 用 Quik mRNA Isolation Kit (Qiegene 公司产品) 从总 RNA中分离 poly (A) mRNA。 2ug poly (A) mRNA经逆转录形 成 cDNA。 用 Smart cDNA克隆试剂盒 (购自 Clontech) 将 cDNA片段定向插入到 pBSK (+) 载体(Clontech公司产品)的多克隆位点上, 转化 DH5 cc, 细菌形成 cDNA文库。 用 Dye terminate cycle react ion sequencing kit (Perkin-Elmer公司产品) 和 ABI 377自 动测序仪(Perkin- Elmer公司)测定所有克隆的 5'和 3'末端的序列。 将测定的 cDNA序 列与已有的公共 DNA序列数据库 (Genebank) 进行比较, 结果发现其中一个克隆 0589 的 cDNA序列为新的 DNA。 通过合成一系列引物对该克隆所含的插入 cDNA片段进行双向 测定。 结果表明, 0589克隆所含的全长 cDNA为 3507bP (如 Seq ID N0: 1所示) , 从第 365bp至 946bp有一个 193bp的开放阅读框架 ( 0RF ) , 编码一个新的蛋白质 (如 Seq ID NO: 2所示) 。 我们将此克隆命名为 pBS-0589, 编码的蛋白质命名为人钙结合 S100蛋 白 21。 实施例 2: cDNA 克隆的同源检索
将本发明的人钙结合 S100蛋白 21的序列及其编码的蛋白序列, 用 Blast程序 (Basiclocal Alignment search tool) [Altschul, SF et al. J.Mol. Biol.1990; 215:403-10], 在 Genbank、 Swissport等数据库进行同源检索。 与 本发明的人钙结合 S100蛋白 21同源性最高的基因是一种已知的同源蛋白神经钙蛋 白, 其编码的蛋白在 Genbank的准入号为 D10884。 蛋白质同源结果示于图 1, 两者高 度同源, 其相同性为 99%; 相似性为 99%。 实施例 3: 用 RT- PCR方法克隆编码人钙结合 S100蛋白 21的基因
用胎脑细胞总 RNA为模板,以 oligo-dT为引物进行逆转录反应合成 cDNA,用 Qiagene 的试剂盒纯化后,用下列引物进行 PCR扩增:
Primerl: 5'- ACGGCTGCGAGAAGACGAAGCTT -3' (SEQ ID NO: 3)
Primer2: 5,— AAGCCACTTTATTCCAGTCCCTT _3, (SEQ ID NO: 4)
Primerl为位于 SEQ ID NO: 1的 5,端的第 lbp开始的正向序列;
Primer2为 SEQ ID NO: 1的中的 3'端反向序列。
扩增反应的条件: 在 50 μ 1的反应体积中含有 50mmol/L KC1, 10mraol/L Tris- Cl, (pH8.5), 1.5mmol/L MgCl2, 200 μ mol/L dNTP, lOpraol引物, 1U的 Taq DNA聚合酶 (Clontech公司产品)。 在 PE9600型 DM热循环仪(Perkin- Elmer公司)上按下列条件反 应 25个周期: 4°C 30sec; 55°C 30sec; 72°C 2min。 在 RT- PCR时同时设 β -act in为 阳性对照和模板空白为阴性对照。 扩增产物用 QIAGEN公司的试剂盒纯化, 用 TA克隆 试剂盒连接到 pCR载体上 (Ir itrogen公司产品) 。 DNA序列分析结果表明 PCR产物的 DNA序列与 SEQ ID NO: 1所示的 1- 3507bp完全相同。 实施例 4: Northern 印迹法分析人钙结合 S100蛋白 21基因的表达:
用一步法提取总 RNA [Anal. Biochem 1987, 162, 156- 159]。 该法包括酸性硫氰酸 胍苯酚 -氯仿抽提。 即用 4M异硫氰酸胍- 25mM柠檬酸钠, 0.2M乙酸钠 ( pH4.0 ) 对组织 进行匀浆, 加入 1倍体积的苯酚和 1/5体积的氯仿-异戊醇 (49: 1 ) , 混合后离心。 吸出水相层, 加入异丙醇 ( 0.8体积) 并将混合物离心得到 RNA沉淀。 将得到的 RNA沉 淀用 70%乙醇洗涤, 干燥并溶于水中。 用 20 g RNA, 在含 20mM 3- (N-吗啉代) 丙磺 酸 (ρΗλ 0) _5mM乙酸钠 - IraM EDTA-2.2M甲醛的 1.2%琼脂糖凝胶上进行电泳。 然后转 移至硝酸纤维素膜上。 用 cx- 32P dATP通过随机引物法制备 32P-标记的 DM探针。 所用 的 DNA探针为图 1所示的 PCR扩增的人钙结合 S100蛋白 21编码区序列(365bp至 946bp)。 将 32P-标记的探针 (约 2 x l06cPm/ml) 与转移了 R 的硝酸纤维素膜在一溶液中于 42°C 杂交过夜, 该溶液包含 50%甲酰胺 -25mM KH2P04 ( pH7.4 ) - 5 χ SSC-5 χ Denhardt's溶 液和 200 μ8/πι1鲑精 DNA。 杂交之后, 将滤膜在 1 χ SSC-O.1%SDS中于 55°C洗 30min。 然 后, 用 Phosphor Imager进行分析和定量。 实施例 5: 重组人钙结合 S100蛋白 21的体外表达、 分离和纯化
根据 SEQ ID NO: 1和图 1所示的编码区序列, 设计出一对特异性扩增引物, 序列如 下:
Primer3: 5'- CCCCATATGATGGGGAAACAGAACAGCAAGCTG -3, ( Seq ID No: 5 ) Primer4: 5'- CCCGGATCCAATTCGATTGGTGGGCGCAGGGCT -3' ( Seq ID No: 6 ) 此两段引物的 5,端分别含有 Ndel 和 BamHI酶切位点, 其后分别为目的基因 5'端和 3'端的编码序列, Ndel 和 BamHI 酶 切 位 点 相 应 于表 达 载 体质 粒 pET- 28b (+) (Novagen公司产品, Cat. No.69865.3)上的选择性内切酶位点。 以含有全长目 的基因的 pBS- 0589质粒为模板, 进行 PCR反应。 PCR反应条件为: 总体积 50 μ ΐ中含 pBS-0589质粒 10pg、 引物 Primer-3和 Primer- 4分别为 10pmol、 Advantage polymerase Mix ( Clontech公司产品) 1 μ 1。 循环参数: 94。C 20s, 60°C 30s, 68°C 2 min,共 25 个循环。 用 Ndel和 BamHI分别对扩增产物和质粒 pET- 28 (+)进行双酶切,分别回收大片 段,并用 T4连接酶连接。连接产物转化用氯化钙法大肠杆细菌 DH5 α ,在含卡那霉素(终 浓度 30)ag/ml) 的 LB平板培养过夜后, 用菌落 PCR方法筛选阳性克隆, 并进行测序。 挑选序列正确的阳性克隆 ( pET- 0589 ) 用氯化钙法将重组质粒转化大肠杆菌 BL21(DE3)plySs (Novagen公司产品)。 在含卡那霉素 (终浓度 30 μ g/ml ) 的 LB液体培 养基中, 宿主菌 BL21 ( pET-0589 ) 在 37。C培养至对数生长期, 加入 IPTG至终浓度 Immol/L, 继续培养 5小时。 离心收集菌体, 经超声波破菌,离心收集上清, 用能与 6 个组氨酸 His- Tag) 结合的亲和层析柱 His. Bind Quick Cartridge (Novagen公司 产品) 进行层析, 得到了纯化的目的蛋白人钙结合 S100蛋白 21。 经 SDS-PAGE电泳, 在 kDa处得到一单一的条带 (图 2) 。 将该条带转移至 PVDF膜上用 Edams水解法进行 N-端氨基酸序列分析, 结果 N-端 15个氨基酸与 SEQ ID NO: 2所示的 N-端 15个氨基酸残 基完全相同。 实施例 6 抗人钙结合 S100蛋白 21抗体的产生
用多肽合成仪 (PE公司产品) 合成下述人钙结合 S100蛋白 21特异性的多肽: NH2- Met- G ly- Lys- G ln-Asn-Ser- Lys- Leu- Arg-Pro- G lu- Va卜 Met- G in- Asp- COOH
(SEQ ID NO: 7)。 将该多肽分别与血蓝蛋白和牛血清白蛋白耦合形成复合, 方 法参见: Avrameas, et a l. Immunochemi s try, 1969; 6: 43。 用 4mg上述血蓝蛋白多肽 复合物加上完全弗氏佐剂免疫家兔, 15天后再用血蓝蛋白多肽复合物加不完全弗氏 佐剂加强免疫一次。 釆用经 15 g/ml牛血清白蛋白多肽复合物包被的滴定板做 ELISA 测定兔血清中抗体的滴度。 用蛋白 A-Sepharose从抗体阳性的家兔血清中分离总 IgG。 将多肽结合于溴化氰活化的 SePharose4B柱上, 用亲和层析法从总 IgG中分离抗多肽 抗体。 免疫沉淀法证明纯化的抗体可特异性地与人钙结合 S100蛋白 21结合。 工业应用性
sioo 涉及神经方面的病症。 这样的病症包括但不限于静坐不能、 老年痴呆 症、 遗忘症、 肌萎缩硬化、 两极细胞紊乱、 紧张症、 脑赘生物、 痴呆、 抑郁症、 唐氏综合症、 迟发性随意运动障碍、 张力障碍、 癫痫症、 亨廷顿舞蹈病、 复合性 硬化症、 神经纤维瘤、 帕金森氏症、 妄想症、 神经分裂症、 图雷特病等。 一方面, 与 S1 00特异结合的抗体直接用作拮抗剂, 或间接作为靶物质 、 或参与运输药物 至表达 S 100的细胞或组织的机制。
si oo 涉及关于膜泡运输紊乱方面的病症 。 这样的病症包括但不限于膀胱纤 维变性, 葡萄糖一半乳糖吸收障碍综合症, 高胆固醇血症, 糖尿病, 低血糖, 格 雷夫斯病, 甲状腺肿, 库欣症和恶性贫血; 肠胃的病症包括溃疡性结肠炎, 胃和 十二指肠溃疡 , 其它与不正常膜泡运输有关的病症, 包括 A IDS; 过敏反应包括 哮喘和风疹, 自身免疫溶血贫血; 扩散性肾小球肾炎; 肠炎, 多重性硬化症, 风湿, 骨关节炎, 重症肌无力, 硬皮病, 切地阿克-东综合症; 系统性红斑狼疮, 毒性休克综合症, 组织外伤, 细菌、 真菌、 寄生虫和 原生动物感染 。 一方面, 特异性与 S1 00 结合的抗体可直接作为拮抗剂, 间接作为靶物质, 参与携带药物 至表达 S 100的细胞或组织的运输 机制。
S 1 00 涉及自身免疫紊乱引起的病症。 这样的病症包括但不仅限于 AI DS, 恶 性贫血, 成人呼吸困难综合症 , 过敏反应, 贫血 , 哮喘, 动脉周样硬化, 支 气管炎, 胆囊炎, 阶段性回肠炎, 溃疡性结肠炎, 特异性 皮肤 炎, 皮肤肌 炎, 糖尿病, 肺气肿 , 萎缩性胃炎, 肾小球肾炎, 痛风, 格雷夫斯病, 嗜曙红 细胞过多, 过敏性肠综合症, 红斑狼疮, 复合性硬化症, 重症肌无力, 心肌 炎, 骨关节炎, 骨质疏松症, 胰腺炎, 多肌炎, 风湿性关节炎, 硬皮症, 斯耶 格伦综合症和自身免疫甲状腺炎, 癌症并发症, 血液透析和体外 循环, 细菌 、 真菌、 寄生虫和原生动物感染和外伤。 一方面, 特异性与 S 100 结合的抗体可直 接作为拮抗剂, 间接作为靶物质, 参与携带药物至表达 S100 的细胞或组织的运 输 机制。
S100涉及肿瘤的发生机制。 这些疾病包括但不仅限于腺癌, 白血病, 淋巴癌, 黑素癌, 骨髓癌, 肉瘤, 畸胎瘤, 特别是子宫颈、 肾上腺、 膀胱、 骨、 骨髓、 脑、 胸、 胆囊、 神经节、 肠胃道、 心、 肾、 肝、 肺、 肌肉、 子房、 胰腺、 甲状旁腺、 阴茎、 前列腺、 唾液腺、 皮肤、 脾、 睾丸、 胸腺、 甲状腺和子宫的癌症。 一方面, 特异性与 S100 结合的抗体可直接作为拮抗剂, 间接作为靶物质, 参与携带药物 至表达 S100的细胞或组织的运输 机制。
本发明的多肽以及该多肽的拮抗剂、 激动剂和抑制剂可直接用于疾病治疗, 例如, 可治疗恶性肿瘤、 肾上腺缺乏症、 皮肤病、 各类炎症、 HIV 感染和免疫性 疾病等。
本发明也提供了筛选化合物以鉴定提高(激动剂)或阻遏(拮抗剂)人钙结合
S100蛋白 21 的药剂的方法。 激动剂提高人钙结合 S100蛋白 21刺激细胞增殖等 生物功能, 而拮抗剂阻止和治疗与细胞过度增殖有关的紊乱如各种癌症。 例如, 能在药物的存在下, 将哺乳动物细胞或表达人钙结合 S100蛋白 21 的膜制剂与标 记的人钙结合 S100蛋白 21 —起培养。 然后测定药物提高或阻遏此相互作用的能 力。
人钙结合 S100蛋白 21 的拮抗剂包括筛选出的抗体、 化合物、 受体缺失物和 类似物等。 人钙结合 S100蛋白 21 的拮抗剂可以与人钙结合 S100蛋白 21结合并 消除其功能, 或是抑制该多肽的产生, 或是与该多肽的活性位点结合使该多肽不 能发挥生物学功能。
在筛选作为拮抗剂的化合物时, 可以将人钙结合 S100蛋白 21加入生物分析 测定中, 通过测定化合物对人钙结合 S100蛋白 21 和其受体之间相互作用的影响 来确定化合物是否是拮抗剂。 用上述筛选化合物的同样方法, 可以筛选出起拮抗 剂作用的受体缺失物和类似物。 能与人钙结合 S100蛋白 21 结合的多肽分子可通 过筛选由各种可能组合的氨基酸结合于固相物组成的随机多肽库而获得。 筛选 时, 一般应对人钙结合 S100蛋白 21分子进行标记。
本发明提供了用多肽, 及其片段、 衍生物、 类似物或它们的细胞作为抗原以 生产抗体的方法。 这些抗体可以是多克隆抗体或单克隆抗体。 本发明还提供了针 对人钙结合 S100蛋白 21 抗原决定簇的抗体。 这些抗体包括(但不限于): 多克隆 抗体、 单克隆抗体、 嵌合抗体、 单链抗体、 Fab片段和 Fab表达文库产生的片段. ; 多克隆抗体的生产可用人钙结合 S100蛋白 21 直接注射免疫动物 (如家免, 小鼠, 大鼠等) 的方法得到, 多种佐剂可用于增强免疫反应, 包括但不限于弗氏 佐剂等。 制备人钙结合 S100蛋白 21 的单克隆抗体的技术包括但不限于杂交瘤技 术(Kohler and Milstein. Nature, 1975, 256: 495-497) , 三瘤技术, 人 Β -细胞 杂交瘤技术, EBV-杂交瘤技术等。 将人恒定区和非人源的可变区结合的嵌合抗体 可用已有的技术生产(Morrison et al , PNAS, 1985, 81: 6851) 0 而已有的生产单 链抗体的技术(U. S. Pat No.4946778)也可用于生产抗人钙结合 S100 蛋白 21 的 单链抗体。
抗人钙结合 S100蛋白 21 的抗体可用于免疫组织化学技术中, 检测活检标本 中的人钙结合 S100蛋白 21。
与人钙结合 S100蛋白 21结合的单克隆抗体也可用放射性同位素标记, 注入 体内可跟踪其位置和分布。 这种放射性标记的抗体可作为一种非创伤性诊断方法 用于肿瘤细胞的定位和判断是否有转移。
抗体还可用于设计针对体内某一特殊部位的免疫毒素。 如人钙结合 S100 蛋 白 21 高亲和性的单克隆抗体可与细菌或植物毒素(如白喉毒素, 蓖麻蛋白, 红豆 碱等)共价结合。 一种通常的方法是用巯基交联剂如 SPDP, 攻击抗体的氨基, 通 过二硫键的交换, 将毒素结合于抗体上, 这种杂交抗体可用于杀灭人钙结合 S100 蛋白 21阳性的细胞。
本发明中的抗体可用于治疗或预防与人钙结合 S100蛋白 21相关的疾病。 给 予适当剂量的抗体可以刺激或阻断人钙结合 S100蛋白 21的产生或活性。
本发明还涉及定量和定位检测人钙结合 S100蛋白 21水平的诊断试验方法。 这些试验是本领域所熟知的, 且包括 FISH 测定和放射免疫测定。 试验中所检测 的人钙结合 S100蛋白 21水平, 可以用作解释人钙结合 S100蛋白 21在各种疾病 中的重要性和用于诊断人钙结合 S100蛋白 21起作用的疾病。
本发明的多肽还可用作肽谱分析, 例如, 多肽可用物理的、 化学或酶进行特 异性切割, 并进行一维或二维或三维的凝胶电泳分析,更好的是进行质谱分析。
编码人钙结合 S100蛋白 21 的多核苷酸也可用于多种治疗目的。 基因治疗技 术可用于治疗由于人钙结合 S100 蛋白 21 的无表达或异常 /无活性表达所致的细 胞增殖、 发育或代谢异常。 重组的基因治疗载体 (如病毒载体)可设计用于表达变 异的人钙结合 S100蛋白 21, 以抑制内源性的人钙结合 S100蛋白 21活性。 例如, 一种变异的人钙结合 S100蛋白 21 可以是缩短的、 缺失了信号传导功能域的人钙 结合 S100 蛋白 21, 虽可与下游的底物结合, 但缺乏信号传导活性。 因此重组的 基因治疗载体可用于治疗人钙结合 S100蛋白 21 表达或活性异常所致的疾病 来 源于病毒的表达载体如逆转录病毒、 腺病毒、 腺病毒相关病毒、 单纯疱疹病毒、 细小病毒等可用于将编码人钙结合 S100蛋白 21 的多核苷酸转移至细胞内。 构建 携带编码人钙结合 S100蛋白 21 的多核苷酸的重组病毒载体的方法可见于已有文 献(Sambrook,et al.)。 另外重组编码人钙结合 S100 蛋白 21 的多核苷酸可包装 到脂质体中转移至细胞内。
多核苷酸导入组织或细胞内的方法包括: 将多核苷酸直接注入到体内组织 中; 或在体外通过载体(如病毒、 噬菌体或质粒等)先将多核苷酸导入细胞中, 再 将细胞移植到体内等。
抑制 {多肽名称} m NA 的寡核苷酸(包括反义 MA 和 DNA)以及核酶也在本发 明的范围之内。 核酶是一种能特异性分解特定 RNA 的酶样 RNA分子, 其作用机制 是核酶分子与互补的靶 RNA特异性杂交后进行核酸内切作用。 反义的 RNA 和 DNA 及核酶可用已有的任何 RNA或 DNA合成技术获得, 如固相磷酸酰胺化学合成法合 成寡核苷酸的技术已广泛应用。 反义 RNA分子可通过编码该 RNA的 DNA序列在体 外或体内转录获得。 这种 DNA序列已整合到载体的 RNA聚合酶启动子的下游。 为 了增加核酸分子的稳定性, 可用多种方法对其进行修饰, 如增加两侧的序列长度, 核糖核苷之间的连接应用磷酸硫酯键或肽键而非磷酸二酯键。
编码人钙结合 S100蛋白 21 的多核苷酸可用于与人钙结合 S100蛋白 21 的相 关疾病的诊断。 编码人钙结合 S100蛋白 21的多核苷酸可用于检测人钙结合 S100 蛋白 21 的表达与否或在疾病状态下人钙结合 S100蛋白 21 的异常表达。 如编码 人钙结合 S100 蛋白 21 的 DM 序列可用于对活检标本进行杂交以判断人钙结合 S100蛋白 21 的表达状况。 杂交技术包括 Southern 印迹法, Northern 印迹法、 原位杂交等。 这些技术方法都是公开的成熟技术, 相关的试剂盒都可从商业途径 得到。 本发明的多核苷酸的一部分或全部可作为探针固定在微阵列(Microarray) 或 DNA 芯片(又称为 "基因芯片" )上, 用于分析组织中基因的差异表达分析和基 因诊断。 用人钙结合 S100蛋白 21特异的引物进行 RNA-聚合酶链反应(RT-PCR)体 外扩增也可检测人钙结合 S100蛋白 21的转录产物。
检测人钙结合 S100蛋白 21基因的突变也可用于诊断人钙结合 S100蛋白 21 相关的疾病。 人钙结合 S100蛋白 21突变的形式包括与正常野生型人钙结合 S100 蛋白 21 DNA 序列相比的点突变、 易位、 缺失、 重组和其它任何异常等。 可用已 有的技术如 Southern 印迹法、 DNA序列分析、 PCR和原位杂交检测突变。 另外, 突变有可能影响蛋白的表达, 因此用 Northern 印迹法、 Western 印迹法可间接判 断基因有无突变。
本发明的序列对染色体鉴定也是有价值的。 该序列会特异性地针对某条人 染色体具体位置且并可以与其杂交。 目前, 需要鉴定染色体上的各基因的具体 位点 ... 现在, 只有很少的基于实际序列数据(重复多态性)的染色体标记物可用 于标记染色体位置。 根据本发明, 为了将这些序列与疾病相关基因相关联, 其 重要的第一步就是将这些 DNA序列定位于染色体上。
简而言之, 根据 cDNA制备 PCR引物(优选 15-35bp), 可以将序列定位于染色 体上。 然后, 将这些引物用于 PCR筛选含各条人染色体的体细胞杂合细胞。 只有 那些含有相应于引物的人基因的杂合细胞会产生扩增的片段。
体细胞杂合细胞的 PCR定位法, 是将 DNA定位到具体染色体的快捷方法。 使 用本发明的寡核苷酸引物, 通过类似方法, 可利用一组来自特定染色体的片段 或大量基因组克隆而实现亚定位。 可用于染色体定位的其它类似策略包括原位 杂交、 用标记的流式分选的染色体预筛选和杂交预选, 从而构建染色体特异的 cDNA库。
将 cDNA克隆与中期染色体进行荧光原位杂交(FI SH), 可以在一个步骤中精 确地进行染色体定位。此技术的综述,参见 Verma等, Human Chromosomes: a Manua l of Bas i c Techniques , Pergamon Pres s, New York (1988)。
一旦序列被定位到准确的染色体位置, 此序列在染色体上的物理位置就可 以与基因图数据相关联。 这些数据可见于例如, V. Mckus i ck, Mende l ian Inher i tance in Man (可通过与 Johns Hopk ins Un i vers i ty We lch Med i ca l L i brary 联机获得)。 然后可通过连锁分析, 确定基因与业已定位到染色体区域上的疾病 之间的关系。
接着, 需要测定患病和未患病个体间的 cDNA或基因组序列差异。 如果在一 些或所有的患病个体中观察到某突变, 而该突变在任何正常个体中来观察到, 则该突变可能是疾病的病因。 比较患病和未患病个体, 通常涉及首先寻找染色 体中结构的变化, 如从染色体水平可见的或用基于 cDNA序列的 PCR可检测的缺失 或易位。 根据目前的物理作图和基因定位技术的分辨能力, 被精确定位至与疾 病有关的染色体区域的 cDNA , 可以是 50至 500个潜在致病基因间之一种(假定 1兆 碱基作图分辨能力和每 20kb对应于一个基因)。
可以将本发明的多肽、 多核苷酸及其模拟物、 激动剂、 拮抗剂和抑制剂与合 适的药物载体组合后使用。 这些载体可以是水、 葡萄糖、 乙醇、 盐类、 缓冲液、 甘油以及它们的组合。 组合物包含安全有效量的多肽或拮抗剂以及不影响药物效 果的载体和赋形剂。 这些组合物可以作为药物用于疾病治疗。
本发明还提供含有一种或多种容器的药盒或试剂盒, 容器中装有一种或多种 本发明的药用组合物成分。 与这些容器一起, 可以有由制造、 使用或销售药品或 生物制品的政府管理机构所给出的指示性提示, 该提示反映出生产、 使用或销售 的政府管理机构许可其在人体上施用。 此外, 本发明的多肽可以与其它的治疗化 合物结合使用。
药物组合物可以以方便的方式给药, 如通过局部、 静脉内、 腹膜内、 肌内、 皮下、 鼻内或皮内的给药途径。 人钙结合 S100蛋白 21以有效地治疗和 /或预防具体的适应症的 量来给药。 施用于患者的人钙结合 S100蛋白 21的量和剂量范围将取决于许多因素, 如给 药方式、 待治疗者的健康条件和诊断医生的判断。
(1)一般信息:
(ii)发明名称: 人钙结合 S100蛋白 21及其编码序列
(iii)序列数目: 7
(2) SEQ ID NO: 1的信息:
(i)序列特征:
(A)长度: 3507 bp
(B)类型: 核酸
(C)链性: 双链
(D)拓扑结构: 线性
(ii)分子类型: cDNA
(xi)序列描述: SEQ ID NO: 1:
WS8§ OAV
Figure imgf000020_0001
81 AAGGGACTGGAATAAAGTGGCTTACGA
(3) SEQ ID NO: 2的信息:
(i)序列特征:
(A)长度: 193个氨基酸
(B)类型: 氨基酸
(D)拓扑结构: 线性
(Π)分子类型: 多肽
(x i)序列描述: SEQ ID NO: 2:
1 Met Gly Lys Gin Asn Ser Lys Leu Arg Pro Glu Val Met Gin Asp
16 Leu Leu Glu Ser Thr Asp Phe Thr Glu His Glu l ie Gin Glu Trp
31 Tyr Lys Gly Phe Leu Arg Asp Cys Pro Ser Gly His Leu Ser Met
46 Glu Glu Phe Lys Lys He Tyr Gly Asn Phe Phe Pro Tyr Gly Asp
61 Ala Ser Lys Phe Ala Glu His Val Phe Arg Thr Phe Asp Ala Asn
76 Gly Asp Gly Thr l ie Asp Phe Arg Glu Phe l ie l ie Ala Leu Ser
91 Val Thr Ser Arg Gly Lys Leu Glu Gin Lys Leu Lys Trp Ala Phe06 Ser Met Tyr Asp Leu Asp Gly Asn Gly Tyr l ie Ser Lys Ala Glu21 Met Leu Glu He Val Gin Ala lie Tyr Lys Met Ala Ser Ser Va l36 Met Lys Met Pro Glu Asp Glu Ser Thr Pro Glu Lys Arg Thr Glu51 Lys l ie Phe Arg Gin Met Asp Thr Asn Arg Asp Gly Lys Leu Ser66 Leu Glu Glu Phe He Arg Gly Ala Lys Ser Asp Pro Ser He Val81 Arg Leu Leu Gin Cys Asp Pro Ser Ser Ala Gly Gin Phe
(4) SEQ ID NO: 3的信息
(i)序列特征
(A)长度: 23碱基
(B)类型: 核酸
(C)链性: 单链 O 01/38524
20
(D)拓扑结构: 线性
(ii)分子类型: 寡核苷酸
(xi)序列描述: SEQ ID NO: 3:
ACGGCTGCGAGAAGACGAAGCTT
(5)SEQ ID NO: 4的信息
(i)序列特征
(A)长度: 23碱基
(B)类型: 核酸
(C)链性: 单链
(D)拓扑结构: 线性
(ii)分子类型: 寡核苷酸
(χϋ序列描述: SEQ ID NO: 4:
AAGCCACTTTATTCCAGTCCCTT
(6) SEQ ID NO: 5的信息
(i)序列特征
(A)长度: 33碱基
(B)类型: 核酸
(C)链性: 单链
(D)拓扑结构: 线性
(ii)分子类型: 寡核苷酸
(xi)序列描述: SEQ ID NO : 5:
CCCCATATGATGGGGAAACAGAACAGCAAGCTG
(7) SEQ ID NO: 6的信息
(i)序列特征
(A)长度: 33碱基
(B)类型 ·. 核酸
(C)链性: 单链
(D)拓扑结构: 线性
( )分子类型: 寡核苷酸
(xi)序列描述: SEQ ID NO : 6: CCCGGATCCAATTCGATTGGTGGGCGCAGGGCT
(8) SEQ ID NO: 7的信息:
(i)序列特征:
(A)长度: 15个氨基酸
(B)类型: 氨基酸
(D)拓扑结构: 线性
(Π)分子类型: 多肽
(xi)序列描述: SEQ ID NO: 7:
Met-Gly-Lys-Gln-Asn-Ser-Lys-Leu-Arg-Pro-Glu-Val-Met-Gln-Asp

Claims

权 利 要 求 书
1、 一种分离的多肽-人钙结合 S100蛋白 21, 其特征在于它包含有: SEQ ID NO: 2所示的氨基酸序列的多肽、 或其多肽的活性片段、 类似物或衍生物。
2、 如权利要求 1 所述的多肽, 其特征在于所述多肽、 类似物或衍生物的氨 基酸序列具有与 SEQ ID NO: 2所示的氨基酸序列至少 95%的相同性。
3、 如权利要求 2 所述的多肽, 其特征在于它包含具有 SEQ ID NO: 2 所示的 氨基酸序列的多肽。
4、 一种分离的多核苷酸, 其特征在于所述多核苷酸包含选自下组中的一种:
(a) 编码具有 SEQ ID NO: 2 所示氨基酸序列的多肽或其片段、 类似物、 衍生 物的多核苷酸;
(b) 与多核苷酸 ) 互补的多核苷酸; 或
(c) 与 ) 或 (b) 有至少 99%相同性的多核苷酸。
5、 如权利要求 4所述的多核苷酸, 其特征在于所述多核苷酸包含编码具有 SEQ ID Ν0·· 2所示氨基酸序列的多核苷酸。
6、 如权利要求 4所述的多核苷酸,其特征在于所述多核苷酸的序列包含有 SEQ ID NO: 1 中 365-946位的序列或 SEQ ID NO: 1 中 1-3507位的序列。
7、 一种含有外源多核苷酸的重组载体, 其特征在于它是由权利要求 4-6 中 的任一权利要求所述多核苷酸与质粒、 病毒或运载体表达载体构建而成的重组载 体。
8、 一种含有外源多核苷酸的遗传工程化宿主细胞, 其特征在于它是选自于 下列一种宿主细胞:
(a) 用权利要求 7所述的重组载体转化或转导的宿主细胞; 或
(b) 用权利要求 4-6 中的任一权利要求所述多核苷酸转化或转导的宿主细胞。
9、 一种具有人钙结合 S100 蛋白 21 活性的多肽的制备方法, 其特征在于所 述方法包括:
(a) 在表达人钙结合 S100 蛋白 21 条件下, 培养权利要求 8 所述的工程化宿 主细胞;
(b) 从培养物中分离出具有人钙结合 S100蛋白 21活性的多肽。
10、 一种能与多肽结合的抗体,其特征在于所述抗体是能与人钙结合 S100 蛋 白 21特异性结合的抗体。
11、 一类模拟或调节多肽活性或表达的化合物, 其特征在于它们是模拟、 促 进、 拮抗或抑制人钙结合 S100蛋白 21 的活性的化合物。
12、 如权利要求 11 所述的化合物, 其特征在于它是 SEQ ID N0: 1 所示的多核 苷酸序列或其片段的反义序列。
13、 一种权利要求 1 1 所述化合物的应用, 其特征在于所述化合物用于调节人 钙结合 S 100蛋白 21在体内、 体外活性的方法。
14、 一种检测与权利要求 1-3 中的任一权利要求所述多肽相关的疾病或疾病 易感性的方法, 其特征在于其包括检测所述多肽的表达量, 或者检测所述多肽的 活性, 或者检测多核苷酸中引起所述多肽表达量或活性异常的核苷酸变异。
15、 如权利要求 1-3 中的任一权利要求所述多肽的应用, 其特征在于它应用 于筛选人钙结合 S100蛋白 21 的模拟物、 激动剂, 拮抗剂或抑制剂; 或者用于肽 指紋图谱鉴定。
16、 如权利要求 4-6 中的任一权利要求所述的核酸分子的应用, 其特征在于 它作为引物用于核酸扩增反应, 或者作为探针用于杂交反应, 或者用于制造基因 芯片或微阵列。
、 如权利要求 1-6 及 11 中的任一权利要求所述的多肽、 多核苷酸或化合物 的应用, 其特征在于用所述多肽、 多核苷酸或其模拟物、 激动剂、 拮抗剂或抑制 剂以安全有效剂量与药学上可接受的载体组成作为诊断或治疗与人钙结合 S 100 蛋白 21异常相关的疾病的药物组合物。
18、 权利要求 1-6 及 11 中的任一权利要求所述的多肽、 多核苷酸或化合物的 应用, 其特征在于用所述多肽、 多核苷酸或化合物制备用于治疗如恶性肿瘤, 血 液病, HIV感染和免疫性疾病和各类炎症的药物。
PCT/CN2000/000462 1999-11-26 2000-11-20 Nouveau polypeptide, proteine humaine 21 fixatrice de calcium, de la famille s100, et polynucleotide codant pour ledit polypeptide WO2001038524A1 (fr)

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