WO2001030837A1 - Nouveau polypeptide, galectine 15, et polynucleotide codant pour ce polypeptide - Google Patents

Nouveau polypeptide, galectine 15, et polynucleotide codant pour ce polypeptide Download PDF

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Publication number
WO2001030837A1
WO2001030837A1 PCT/CN2000/000376 CN0000376W WO0130837A1 WO 2001030837 A1 WO2001030837 A1 WO 2001030837A1 CN 0000376 W CN0000376 W CN 0000376W WO 0130837 A1 WO0130837 A1 WO 0130837A1
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Prior art keywords
polypeptide
polynucleotide
human
galectinl5
seq
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PCT/CN2000/000376
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English (en)
French (fr)
Inventor
Yumin Mao
Yi Xie
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Shanghai Bio Road Gene Development Ltd.
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Priority to AU13782/01A priority Critical patent/AU1378201A/en
Priority to US10/111,552 priority patent/US6919430B1/en
Publication of WO2001030837A1 publication Critical patent/WO2001030837A1/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
    • C07K14/4726Lectins
    • 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 novel polypeptide, human galectinl5, and a polynucleotide sequence encoding the polypeptide. The invention also relates to a preparation method and application of the polynucleotide and the polypeptide.
  • CLC Charge-Leyden Crystal
  • granulocytic leukocyte lysophospholipase is a typical protein of human granulocytic leukocytes and alkaline cells.
  • CLC proteins are structurally and functionally related to the galectin family of P-galactosyl binding proteins. Galectin as a family has a series of common characteristics, including a linear ligand binding site (encoded by an exon). The structure of the gene encoding the CLC protein is similar to that of the gene encoding galectin.
  • Galectins is a family of animal ⁇ -galactoside-binding phytohemagglutinins, mammalian phytohemagglutinins are divided into four types: C-type, P-type, pentraxins, and galectins (thiol-dependent, specifically binding P-galactosides Residues); galectin is divided into S-type and S-Lac. Galectin has two necessary biochemical properties: 1) unique amino acid homologous sequences; 2] has affinity for ⁇ -galactose.
  • the coding sequence of the CLC protein gene is divided into four exons, including the ⁇ -galactosyl binding site encoded by exon III, namely the sugar binding domain, which is highly conserved; the CLC protein lacks a single Peptide; secreted into the cytoplasm after synthesis; is a soluble protein secreted through atypical channels. These are typical characteristics of galectins. Therefore, we consider this newly discovered protein to be a member of galectins and call it human galectinl5.
  • Another object of the invention is to provide a polynucleotide encoding the polypeptide.
  • Another object of the present invention is to provide an antibody against the polypeptide of the present invention, A galectinl5.
  • Another object of the present invention is to provide mimic compounds, antagonists, agonists, and inhibitors directed to the polypeptide of the present invention, A galectinl5.
  • Another object of the present invention to provide a method of diagnosis and treatment of diseases associated with abnormal human C tinl5 gale.
  • a novel isolated human galectinl5 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 an active fragment thereof; Or its active derivatives, analogs.
  • 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 aforementioned human galectinl5; (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 225-644 in SEQ ID NO: 1; and (b) a sequence having 1-775 in SEQ ID NO: 1 Sequence of bits.
  • Fig. 1 is a comparison diagram of amino acid sequence homology between human galectinl5 and human galectinlO of the present invention.
  • the upper sequence is human galectinl5, and the lower sequence is human galectinlO.
  • Identical amino acids are represented by single-character amino acids between the two sequences, and similar amino acids are represented by "+”.
  • FIG. 2 is a polyacrylamide gel electrophoresis image (SDS-PAGE) of isolated human galectinl5. 15 kDa is the molecular weight of the protein. The arrow indicates the isolated protein band. Summary of the invention
  • 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 in the natural state .
  • isolated human galect inl5 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 galectinl5 using standard protein purification techniques.
  • Substantially pure polypeptides can produce a single main band on a non-reducing polyacrylamide gel. Amino acid sequence analysis of human gal eC tinl5 purity polypeptide can.
  • the present invention provides a new polypeptide, human galectinl5, which basically consists of the amino acid sequence shown in SEQ ID NO: 2.
  • the polypeptide of the present invention may be a recombinant polypeptide, a natural polypeptide, or a synthetic polypeptide, and preferably a recombinant polypeptide.
  • the polypeptides of the present invention 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 galectinl5.
  • fragment refers to a polypeptide of the present invention remains substantially the same person gale C tinl5 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 substituted with conservative or non-conservative amino acid residues (preferably conservative amino acid residues), and the substitution
  • the amino acid may or may not be encoded by 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 ( ⁇ ) 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 an additional amino acid sequence is fused to the mature polypeptide ( Such as the leader sequence or secreted sequence or the sequence used to purify this polypeptide or protease sequence)
  • an additional amino acid sequence is fused to the mature polypeptide (such as the leader sequence or secreted sequence or the sequence used to purify this polypeptide or proteas
  • the present invention provides an isolated nucleic acid (polynucleotide), which basically consists of a polynucleotide encoding a polypeptide having the amino acid sequence of SEQ ID NO: 2.
  • the polynucleotide sequence of the present invention includes the nucleotide sequence of SEQ ID NO: 1.
  • the polynucleotide of the present invention is found from a CDM library of human fetal brain tissue. It packs The polynucleotide sequence is 775 bases in length and its open reading frame (225-644) encodes 139 amino acids. According to the amino acid sequence homology comparison, it was found that this polypeptide has 50% homology with human galecint, and it can be inferred that the human galectinl 5 has a similar structure and function to human galecint.
  • the polynucleotide of the present invention may be in the D form or the RNA form.
  • DNA forms include cDNA, genomic DNA, or synthetic DNA.
  • DNA can be single-stranded or double-stranded.
  • DNA can be coding or non-coding.
  • the coding region sequence encoding a mature polypeptide may be the same as the coding region sequence shown in SEQ ID NO: 1 or a degenerate variant.
  • a "degenerate variant" refers to a nucleic acid sequence encoding a protein or polypeptide having SEQ ID NO: 2 but different from the coding region sequence shown in SEQ ID NO: 1 in the present invention.
  • the polynucleotide encoding the mature polypeptide of SEQ ID NO: 2 includes: only the coding sequence of the mature polypeptide; the coding sequence of the mature polypeptide and various additional coding sequences; the coding sequence of the mature polypeptide (and optional additional coding sequences); Coding sequence.
  • polynucleotide encoding a polypeptide refers to a polynucleotide 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.
  • an allelic variant is an alternative form of a polynucleotide that may be a substitution, deletion, or insertion of one or more nucleotides, but does not substantially change the function of the polypeptide it encodes .
  • the invention also relates to a polynucleotide that hybridizes to the sequence described above (having at least 50%, preferably 70% identity, between the two sequences).
  • the present invention particularly relates to polynucleotides that can hybridize to the polynucleotides of the present invention under stringent conditions.
  • "strict conditions” means: (1) hybridization and elution at lower ionic strength and higher temperature, such as 0.2xSSC, 0.1% SDS, 6 (TC; or (2) Add a denaturant during hybridization, such as 50% (v / v) formamide, 0.1 ° /. Calf serum / 0.1 ° /. F i co ll, 42 ° C, etc .; or
  • Hybridization occurs only when the identity between two sequences is at least 95%, and more preferably 97%.
  • the polypeptide encoded by the hybridizable polynucleotide has the same biological function and activity as the mature polypeptide shown in SEQ ID NO: 2.
  • the invention also relates to nucleic acid fragments that hybridize to the sequences described above.
  • “core The "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 nucleotides. Nucleic acid fragments It can also be used in nucleic acid amplification techniques (such as PCR) to identify and / or isolate polynucleotides encoding human galectinl 5.
  • 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 ga lect inl 5 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) separating the double-stranded DM sequence from the genomic DNA; 2) chemically synthesizing the DNA sequence to obtain the double-stranded DNA of the polypeptide.
  • genomic DM is the least commonly used. Direct chemical synthesis of DM sequences is often the method of choice. The more commonly used method is the separation of cDM sequences.
  • the standard method for isolating the cDNA of interest is to isolate mRNA from donor cells that overexpress the gene and perform reverse transcription to form a plasmid or phage cDNA library.
  • Various methods have been used to extract mRNA, and kits are also commercially available (Qiagene).
  • the construction of a CDM library is also a common method (Sambrook, et al., Molecular Cloning, A Laboratory Manua, Cold Spring Harbor Labora tory. New York, 1989).
  • Commercially available cDNA libraries are also available, such as different cDNA libraries from Clontech. When polymerase reaction technology is used in combination, even very small expression products can be cloned.
  • genes can be screened from these cDNA libraries by conventional methods. These methods include (but are not limited to): (l) DNA-DM or DNA-RNA hybridization; (2) the presence or absence of marker gene functions; (3) determination of human ga le C t inl 5 transcript levels; ( 4) Detecting gene-expressed protein products by immunological techniques or by measuring biological activity. The above methods can be used singly or in combination.
  • the probe used for hybridization is homologous to any part of the polynucleotide of the present invention, and its length is at least 10 nucleotides, preferably at least 30 nucleotides, more preferably At least 50 nucleotides, preferably at least 100 nucleotides.
  • the length of the probe is usually within 2000 nucleotides, preferably within 1000 nucleotides.
  • the probe used here is 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).
  • immunological techniques can be used to detect the protein product expressed by the human galec tinl 5 gene.
  • Techniques include Western blotting, radioimmunoprecipitation, and enzyme-linked immunosorbent assay (ELISA).
  • the RACE method RACE-Rapid Amplification of cDNA Ends
  • the primers for PCR can be appropriately based on the polynucleotide sequence information of the present invention disclosed herein Select and synthesize using conventional methods.
  • the amplified DNA / RNA fragments can be isolated and purified by conventional methods such as by gel electrophoresis.
  • polynucleotide sequence of the gene of the present invention or various DNA fragments and the like obtained as described above can be measured by a conventional method such as dideoxy chain termination method (Sanger et al. PNAS, 1977, 74: 5463-5467). Such polynucleotide sequences can also be determined using commercial sequencing kits and the like. In order to obtain the full-length cDNA sequence, sequencing needs to be repeated. Sometimes it is necessary to determine the cDNA sequence of multiple clones in order to splice into a full-length cDNA sequence.
  • the present invention also relates to a vector comprising the polynucleotide of the present invention, and a host cell genetically engineered using the vector of the present invention or directly using a human galectinl5 coding sequence, and a method for producing a polypeptide of the present invention by recombinant technology.
  • a polynucleotide sequence encoding human galectinl5 can be inserted into a vector to constitute a recombinant vector containing the polynucleotide of the present invention.
  • vector refers to bacterial plasmids, phages, yeast plasmids, plant cell viruses, mammalian cell viruses such as adenoviruses, retroviruses, or other vectors well known in the art.
  • Vectors suitable for use in the present invention include, but are not limited to: T7 promoter-based expression vectors (Rosenberg, et al.
  • any plasmid and vector can be used to construct a recombinant expression vector.
  • An important feature of expression vectors is that they usually contain origins of replication, promoters, marker genes, and translational regulatory elements.
  • Methods known to those skilled in the art can be used to construct expression vectors containing DM sequences encoding human galectinl5 and appropriate transcription / translation regulatory elements. These methods include in vitro recombinant DNA technology, DNA synthesis technology, and in vivo recombination technology (Sambroook, et al. Molecular Cloning, a Laboratory Manual, Cold Spring Harbor Laboratory. New York, 1989).
  • the DNA sequence can be operably linked to an appropriate promoter in an expression vector to guide mRM synthesis. Representative examples of these promoters are: lac or trp promoter of E.
  • eukaryotic promoters include the CMV immediate early promoter, HSV thymidine kinase promoter, early and late SV40 promoters, retroviral LTRs, and other known controllable genes in prokaryotic or eukaryotic cells Or a promoter expressed in its virus.
  • 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 expressed by DM, usually about 10 to 300 base pairs, which act on promoters to enhance gene transcription.
  • Illustrative examples include SV40 enhancers of 100 to 270 base pairs on the late side of the origin of replication, polyoma enhancers on the late side of the origin of replication, and adenovirus enhancers.
  • the expression vector preferably contains one or more selectable marker genes to provide phenotypic traits for selection of transformed host cells, such as dihydrofolate reductase, neomycin resistance, and green for eukaryotic cell culture.
  • selectable marker genes to provide phenotypic traits for selection of transformed host cells, such as dihydrofolate reductase, neomycin resistance, and green for eukaryotic cell culture.
  • GFP fluorescent protein
  • tetracycline or ampicillin resistance for E. coli.
  • a polynucleotide encoding human galectinl5 or a recombinant vector containing the polynucleotide can be transformed or transduced into a host cell to constitute a genetically engineered host cell containing the polynucleotide or the recombinant vector.
  • the term "host cell” refers to a prokaryotic cell, such as a bacterial cell; or a lower eukaryotic cell, such as a yeast cell; or a higher eukaryotic cell, such as a mammalian cell. Representative examples are: E.
  • coli Streptomyces
  • bacterial cells such as Salmonella typhimurium
  • fungal cells such as yeast
  • plant cells such as 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.
  • 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 (1 2 method used in the step are well known in the art. Alternatively, it is a MgCl 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 liposome packaging Wait.
  • the polynucleotide sequence of the present invention can be used to express or produce recombinant human galectinl5 (Science, 1984; 224: 1431). Generally there are the following steps:
  • the medium used in the culture may be selected from various conventional mediums. Culture is performed under conditions suitable for host cell growth. After the host cells have grown to an appropriate cell density, the selected promoter is induced by a suitable method (such as temperature conversion or chemical induction), and the cells are cultured for a period of time.
  • a suitable method such as temperature conversion or chemical induction
  • the recombinant polypeptide may be coated in a cell, expressed on a cell membrane, or secreted outside the cell. If necessary, the recombinant protein can be isolated and purified by various separation methods using its physical, chemical and other properties. These methods are well known to those skilled in the art. These methods include, but are not limited to: conventional renaturation treatment, protein precipitant treatment (salting out method), centrifugation, osmotic disruption, ultrasonic treatment, ultracentrifugation, molecular sieve chromatography (gel filtration), adsorption chromatography, ion Exchange chromatography, high performance liquid chromatography (HPLC) and various other liquid chromatography techniques and combinations of these methods.
  • conventional renaturation treatment protein precipitant treatment (salting out method), centrifugation, osmotic disruption, ultrasonic treatment, ultracentrifugation, molecular sieve chromatography (gel filtration), adsorption chromatography, ion Exchange chromatography, high performance liquid
  • galectinll proteins or peptides have many uses.
  • the galectinll protein plays many important roles in human physiology, development, and pathology.
  • These uses include (but are not limited to) direct use as a drug to treat diseases caused by hypofunction or loss of galectinll protein and to screen antibodies, peptides or other ligands that promote or counteract galectinll protein function.
  • antibodies can be used to activate or inhibit the function of the galectinll protein.
  • Screening peptide libraries with expressed recombinant galectinll proteins can be used to find therapeutically valuable polypeptide molecules that can inhibit or stimulate galectinll protein function.
  • the invention also provides methods for screening compounds to identify agents that increase (agonist) or suppress (antagonist) human galectinl5.
  • Agonists enhance human galectinl5 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 a membrane preparation expressing human galectinl5 can be cultured with labeled human galectinl5 in the presence of a drug. The ability of the drug to increase or block this interaction is then determined.
  • Antagonists of human galectinl5 include screened antibodies, compounds, receptor deletions, and the like. Antagonists of human galectinl5 can bind to human galectinl5 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 gale C tinl5 When screening compounds as antagonists, human gale C tinl5 can be added to bioanalytical assays to determine the effect of the compound on the interaction between human galectinl5 and its receptor Whether the compound is an antagonist. Receptor deletions and analogs that act as antagonists can be screened in the same manner as described above for screening compounds.
  • Polypeptide molecules capable of binding to human galectinl5 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 galectinl5 molecules should generally be labeled.
  • the present invention provides a method for producing antibodies using polypeptides, and fragments, derivatives, analogs or cells thereof as antigens. These antibodies can be polyclonal or monoclonal antibodies.
  • the invention also provides antibodies against human galectinl5 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 galectinl5 directly into immunized animals (such as rabbits, mice, rats, etc.).
  • immunized animals such as rabbits, mice, rats, etc.
  • a variety of adjuvants can be used to enhance the immune response, including but not limited to Freund's adjuvant.
  • Techniques for preparing monoclonal antibodies to human galectinl5 include, but are not limited to, hybridoma technology (Kohler and Milstein. Nature, 1975, 256: 495-497), triple tumor technology, human beta-cell hybridoma technology, EBV-hybridoma 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 galectinl5.
  • Anti-human g a l e ctinl5 antibody can be used in immunohistochemistry to detect human galect inl5 in biopsy specimens.
  • Monoclonal antibodies that bind to human galectinl5 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 galectinl5 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 galect inl5 positive cells.
  • the antibodies in the present invention can be used to treat or prevent diseases associated with human galect inl5.
  • Administration of appropriate doses of antibodies can stimulate or block the production or activity of human galectinl5.
  • the invention also relates to a diagnostic test method for quantitatively and locally detecting the level of human galectinl5.
  • tests are well known in the art and include FISH assays and radioimmunoassays. Tested during the test Human galectinl5 levels can be used to explain the importance of human galectinl5 in various diseases and to diagnose diseases in which human galectinl5 functions.
  • polypeptide of the present invention can also be used for peptide mapping analysis.
  • the polypeptide can be specifically cleaved by physical, chemical or enzymatic analysis, and subjected to one-dimensional or two-dimensional or three-dimensional gel electrophoresis analysis, and more preferably mass spectrometry analysis.
  • Polynucleotides encoding human g alectinl5 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 galectinl5.
  • Recombinant gene therapy vectors (such as viral vectors) can be designed to express mutated human galectinl5 to inhibit endogenous human galectinl5 activity.
  • a mutant human galectinl5 may be a shortened human galectinl5 lacking a signaling domain. Although it can bind to downstream substrates, it lacks signaling activity. Therefore, the recombinant gene therapy vector can be used for treating diseases caused by abnormal expression or activity of human galectinl5.
  • Virus-derived expression vectors such as retrovirus, adenovirus, adenovirus-associated virus, herpes simplex virus, parvovirus, etc. can be used to transfer a polynucleotide encoding human galectinl5 into a cell.
  • Methods for constructing a recombinant viral vector carrying a polynucleotide encoding human galect inl5 can be found in existing literature (Sambrook, et al.). Further recombinant polynucleotide encoding a human gal eC tinl5 transferred may be packaged into liposomes into cells.
  • Methods for introducing a polynucleotide into a tissue or cell include: directly injecting the polynucleotide into a tissue in vivo; or introducing the polynucleotide into a cell in vitro through a vector (such as a virus, phage, or plasmid), and then transplanting the cell Into the body and so on.
  • a vector such as a virus, phage, or plasmid
  • Oligonucleotides including antisense RNA and DNA
  • ribozymes that inhibit human galectinl5 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, DM, and ribozymes can be obtained using any existing RNA or DM 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 DM sequence has been integrated downstream of the RNA polymerase promoter of the vector.
  • it can be modified in a variety of ways, such as increasing the sequence length on both sides, and the phosphorothioate or peptide bond instead of the phosphodiester bond is used for the ribonucleoside linkage.
  • the polynucleotide encoding human galectinl5 can be used for the diagnosis of diseases related to human galectinl5.
  • the polynucleotide encoding human galectinl5 can be used to detect the expression of human galectinl5 or the abnormal expression of human galectinl5 in a disease state.
  • DM sequence encoding human galectinl5 is available In order to judge the expression of human galectinl5, the biopsy specimens were hybridized.
  • Hybridization techniques include Southern blotting, Northern blotting, in situ hybridization, and the like. 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.
  • Gal eC tinl5 employing specific primers RNA- polymerase chain reaction (RT- PCR) amplification can also be detected in vitro transcription products of human galectinl5.
  • Detection of mutations in the human galectinl5 gene can also be used to diagnose human galectinl5-related diseases.
  • Human galectinl5 mutations include point mutations, translocations, deletions, recombinations, and any other abnormalities compared to the normal wild-type human galectinl5 DM sequence. Mutations can be detected using existing techniques such as Southern imprinting, DNA sequence analysis, PCR and in situ hybridization. In addition, mutations may affect protein expression. Therefore, Northern blotting and Western blotting can be used to indirectly determine whether a gene is mutated.
  • sequences of the invention are also valuable for chromosome identification. This sequence will specifically target a specific position on a human chromosome and can hybridize to it. Currently, the specific loci of each gene on the chromosome need to be identified. Currently, only a few chromosome markers based on actual sequence data (repeating polymorphisms) can be used to mark chromosome locations. According to the present invention, in order to associate these sequences with disease-related genes, an important first step is to locate these DNA sequences on a chromosome.
  • PCR primers (preferably 15-35bp) are prepared based on 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 hybrid cells that contain the human gene corresponding to the primer will produce amplified fragments.
  • PCR localization of somatic hybrid cells is a quick way to localize DNA to specific chromosomes.
  • oligonucleotide primers of the present invention by a similar method, 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 hybrid pre-selection to construct chromosome-specific cDNA libraries.
  • Fluorescent in situ hybridization (FISH) of cDNA clones to metaphase chromosomes allows precise chromosomal localization in one step.
  • FISH Fluorescent in situ hybridization
  • the difference in cDNA or genomic sequence between the affected and unaffected individuals needs to be determined. If a mutation is observed in some or all of the affected individuals and the mutation is not 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 the chromosome, such as deletions or translocations that are visible at the chromosomal level or detectable with cDNA sequence-based PCR. According to the resolution capabilities of current physical mapping and gene mapping technology, the cDNA accurately mapped to the chromosomal region associated with the disease can be one of 50 to 500 potentially pathogenic genes (assuming 1 megabase mapping resolution) Capacity and each 20kb corresponds to a gene).
  • the polypeptides, polynucleotides and mimetics, agonists, antagonists and inhibitors of the present invention can be used in combination with a suitable pharmaceutical carrier.
  • suitable pharmaceutical carrier can be water, glucose, ethanol, salts, buffers, glycerol, and combinations thereof.
  • the composition comprises a safe and effective amount of the polypeptide or antagonist, and carriers and excipients which do not affect the effect of the drug. These compositions can be used as drugs for the treatment of diseases.
  • the invention also provides a kit or kit containing one or more containers containing one or more ingredients of the pharmaceutical composition of the invention.
  • a kit or kit containing one or more containers containing one or more ingredients of the pharmaceutical composition of the invention.
  • these containers there may be instructional instructions given by government agencies that manufacture, use, or sell pharmaceuticals or biological products, which prompts permission for administration on the human body by government agencies that produce, use, or sell.
  • the polypeptides of the invention can be used in combination with other therapeutic compounds.
  • the pharmaceutical composition can be administered in a convenient manner, such as by a topical, intravenous, intraperitoneal, intramuscular, subcutaneous, intranasal or intradermal route of administration.
  • Human galectinl5 is administered in an amount effective to treat and / or prevent a specific indication.
  • the amount and range of human galectinl5 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.
  • RNA Human fetal brain total RNA was extracted by one-step method with guanidine isothiocyanate / phenol / chloroform.
  • Poly (A) mRNA was isolated from total RNA using the Quik mRNA Isolation Kit (Qiegene). 2ug poly (A) mRNA is reverse transcribed to form cDNA.
  • a Smart cDNA cloning kit purchased from Clontech
  • Dye terminate cycle reaction sequencing ki t (Perkin-Elmer) and ABI 377 automatic sequencer (Perkin-Elmer) to determine the 5 'and 3' ends of all clones. Compare the determined cD sequence with the existing public DNA sequence database (Genebank), It was found that the CDM sequence of one of the clones 0484E08 was new DNA. A series of primers were synthesized to determine the inserted CDM fragments of the clone in both directions.
  • the sequence of the human galectinl5 and the protein sequence encoded by the present invention were subjected to a Blast program (Basic local alignment search tool) [Al tschul, SF et al.
  • CDNA was synthesized using fetal brain total RNA as a template and ol igo-dT as a primer for reverse transcription reaction.
  • PCR amplification was performed with the following primers:
  • Primerl 5'-GGCTGCATTACAGACACAGACCTG-3 '(SEQ ID NO: 3)
  • Primer2 5,-GTTTGGTGCTGTTTTAATGATCAT- 3, (SEQ ID NO: 4)
  • Priraerl is a forward sequence beginning at lbp at the 5 ′ end of SEQ ID NO: 1; 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 ⁇ mol / L dNTP, lOpmol primer, 1U in a reaction volume of 50 ⁇ 1 Taq D polymerase (Clontech).
  • the reaction was performed on a PE9600 DM thermal cycler (Perkin-Elmer) for 25 cycles under the following conditions: 94 ° 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.
  • the amplified product was purified using a QIAGEN kit and ligated to a PCR vector (Invitrogen product) using a TA cloning kit. DNA sequence analysis results showed that the DNA sequence of the PCR product was exactly the same as that of 1-775bp shown in SEQ ID NO: 1.
  • Example 4 Northern blot analysis of human galectinl5 gene expression
  • RNA extraction in one step [Anal. Biochem 1987, 162, 156-159] 0
  • This method involves acid guanidinium thiocyanate-chloroform extraction. That is, the tissue is homogenized with 4M guanidine isothiocyanate-25mM sodium citrate, 0.2M sodium acetate (pH4.0), and 1 time 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 prepared using 20 ⁇ g of RNA, electrophoresis was performed on a 1.2% agarose gel containing 20 mM 3- (N-morpholino) propanesulfonic acid (PH7.0)-5 mM sodium acetate-1 mM EDTA-2.2M formaldehyde. It was then transferred to a nitrocellulose membrane. Preparation 32 ⁇ - DM probe labeled with a- 32 P dATP by random priming method. DM probes used for PCR amplification of FIG. 1 g a lectinl5 human coding sequence (225bp to 644bp).
  • the 32 P- labeled probes (about 2 x l0 0 cpm / ml) and RNA was transferred to a nitrocellulose membrane overnight at 42 ° C in a hybridization solution, the solution comprising 50% formamide -25mM KH 2 P0 4 (pH7.4) -5 SSC-5xDenhardt, s solution and 200 g / ml salmon sperm DNA. After hybridization, the filter was washed in 1 x SSC-0.1% SDS at 55 ° C for 30 min. Then, Phosphor Imager was used for analysis and quantification.
  • Example 5 In vitro expression, isolation and purification of recombinant human galectinl5
  • Primer3 5,-CCCCCATGGATGTCATCACTACCCGTACCATAC-3 '(Seq ID No: 5)
  • Primer4 5' -CATGGATCCCCATCGCTGATAAGCACTCTGGTC-3 '(Seq ID No: 6)
  • the 5' ends of these two primers contain Ncol and BamHI restriction sites, respectively.
  • 5 'end of target gene And the 3 'end coding sequence, the Nco I and BamH I restriction sites correspond to the selective endonuclease sites on the expression vector plasmid pET-28b (+) (Novagen, Cat. No. 69865.3).
  • the pBS-0484E08 plasmid containing the full-length target gene was used as a template for the PCR reaction.
  • the PCR reaction conditions were as follows: a total volume of 50 ⁇ 1 containing 10 pg of pBS-0484E08 plasmid, primers Primer-3 and Primaer-4 were lpmol Advantage polymerase Mix (Clontech) 1 ⁇ 1, respectively. Cycle parameters: 94 C 20s, 60 ° C 30s, 68 ° C 2 min, a total of 25 cycles. Ncol 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. coli DH5C using the calcium chloride method.
  • the bacteria were collected by centrifugation, and the supernatant was collected by centrifugation. The supernatant was collected by centrifugation. Chromatography was performed using an His. Bind Quick Cartridge (product of Novagen) which can bind 6 histidines (6His-Tag).
  • the purified target protein human galectinl5 was obtained by SDS-PAGE electrophoresis, and a single band was obtained at 15 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.
  • a peptide synthesizer (product of PE company) was used to synthesize the following human galectinl5-specific peptides:
  • Rabbits were immunized with 1 ⁇ 2 g 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. ⁇ Using a 15 g / ml bovine serum albumin peptide complex-coated titer plate as an ELISA to determine antibody titers in rabbit serum. Total IgG was isolated from antibody-positive rabbit serum using protein A-Sepharose. The polypeptide was bound to a cyanogen bromide-activated Sepha rOS e4B column, and the anti-peptide antibody was separated from the total i gG by affinity chromatography. The immunoprecipitation method proved that the purified antibody could specifically bind to human gal e ctinl5.

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Description

一种新的多肽——人 galeCtiril5和编码这种多肽的多核苷酸
#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——人 galectinl5, 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。
#术背景
CLC (Charcot-Leyden Crystal)蛋白或称粒性曙红白细胞溶血磷脂酶, 是 人粒性曙红白细胞和碱性细胞的典型蛋白。 近来工作已证明 CLC蛋白在结构和 功能上与 P -半乳糖苷结合蛋白的 galectin家族有关。 Galectin作为一个家 族有一系列共同的特征, 包括一个线型配体结合位点 (由一个外显子编码) , 编码 CLC蛋白基因的结构与编码 galectin的基因相类似。
Galectins是动物 β -半乳糖苷结合植物血凝素的一个家族, 哺乳动物植 物血凝素分为四个类型: C型、 Ρ型、 pentraxins和 galectins (巯基依赖型, 特异结合 P -半乳糖苷残基); galectin又分为 S型和 S-Lac 。 Galectin有 两个必需的生物化学特性: 1〕 特有的氨基酸同源序列; 2〕 与 β -半乳糖具有 亲和力。 CLC蛋白基因的编码序列分为四个外显子, 包括由外显子 III编码的 β -半乳糖苷结合位点,即糖结合结构域, 此结构域具有高度保守性; CLC蛋 白缺一个单肽; 合成后分泌到细胞质; 是一种通过非典型通道分泌的可溶性蛋 白。 这些都是 galectins的典型特性。 因此我们认为此新发现的蛋白是 galectins 中的一员, 并将它命为人 galectinl5。
发明目的
本发明的一个目的是提供分离的新的多肽—— A galectinl5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 galectinl5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 galectinl5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 galeCtinl5的方法。
本发明的另一个目的是提供针对本发明的多肽—— A galectinl5的抗体。 本发明的另一个目的是提供了针对本发明多肽—— A galectinl5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 galeCtinl5异常相关的疾病的 方法。
发明概要
在本发明的第一方面, 提供新颖的分离出的人 galectinl5, 该多肽是人源 的, 它包含: 具有 SEQ ID N0: 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 galectinl5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 225- 644 位的序列; 和(b)具有 SEQ ID NO: 1中 1-775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。
附图说明
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 galectinl5和人 galectinlO的氨基酸序列同源性比较图。 上方序列是人 galectinl5, 下方序列是人 galectinlO。 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 galectinl5的聚丙烯酰胺凝胶电泳图 ( SDS- PAGE ) 。 15 kDa为蛋白质的分子量。 箭头所指为分离出的蛋白条带。 发明内容
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 galectinl5" 是指人 galect inl5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 galectinl5。 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 galeCtinl5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——人 galectinl5, 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 galectinl5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 galeCtinl5 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 ( II ) 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 ( ΠΙ ) 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 ( IV) 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 cDM文库中发现的。 它包 含的多核苷酸序列全长为 775个碱基, 其开放读框 ( 225-644 ) 编码了 139个 氨基酸。 根据氨基酸序列同源比较发现, 此多肽与人 ga l ec t in有 50%的同源 性, 可推断出该人 ga l ect inl 5具有人 ga lec t in相似的结构和功能。
本发明的多核苷酸可以是 D 形式或是 RNA形式。 DNA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. 2xSSC, 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°/。F i co l l, 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 ga lect inl 5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 ga lect inl 5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 DM 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 DM最不常用。 DM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 cDM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 cDM文库也是通常的方法(Sambrook, e t a l . , Molecular Clon ing, A Laboratory Manua l , Cold Spr ing Harbor Labora tory. New York, 1989)。还可得到商业供应的 cDNA文库,如 Cl ontech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-DM或 DNA- RNA杂交; (2)标志基因功能的出现或丧失; (3)测 定人 ga leC t inl 5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 ga l ec t inl 5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 galectinl5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 galectinl5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 Chera. 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 galectinl5的 DM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 mRM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 100到 270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 galectinl5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 Sf9; 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 MgCl2。 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 DNA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 galectinl5(Science, 1984; 224: 1431)。 一般来说有以下步骤:
(1) 用本发明的编码人 人 galectinl5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。
在步骤 (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。
在步驟 ( 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。
重组的 galectinll蛋白或多肽有多方面的用途。 galectinll蛋白在人的 生理、 发育和病理等方面起着许多重要作用。
这些用途包括 (但不限于) 直接做为药物治疗 galectinll蛋白功能低下 或丧失所致的疾病和用于筛选促进或对抗 galectinll蛋白功能的抗体, 多肽 或其它配体。 例如, 抗体可用于激活或抑制 galectinll蛋白的功能。 用表达 的重组 galectinll蛋白筛选多肽库可用于寻找有治疗价值的能抑制或刺激 galectinll蛋白功能的多肽分子。
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 galectinl5的药剂的方法。 激动剂提高人 galectinl5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 galectinl5的膜制剂与标记的人 galectinl5一起培养。 然后测定药物提高或阻遏此相互作用的能力。
人 galectinl5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 galectinl5的拮抗剂可以与人 galectinl5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 galeCtinl5加入生物分析测定 中, 通过测定化合物对人 galectinl5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 galectinl5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 galectinl5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 galectinl5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 galectinl5直接注射免疫动物 (如家兔, 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 galectinl5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)„ 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 galectinl5的单链抗体。
抗人 galectinl5的抗体可用于免疫组织化学技术中, 检测活检标本中的 人 galect inl5。
与人 galectinl5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 galectinl5 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 galect inl5 阳性的细胞。
本发明中的抗体可用于治疗或预防与人 galect inl5相关的疾病。 给予适 当剂量的抗体可以刺激或阻断人 galectinl5的产生或活性。
本发明还涉及定量和定位检测人 galectinl5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 galectinl5水平, 可以用作解释人 galectinl5在各种疾病中的重要性和用 于诊断人 galectinl5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 galectinl5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 galectinl5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 galectinl5, 以抑制内源性的人 galectinl5活性。 例如, 一种变异的人 galectinl5可以是缩短的、 缺失了信号传导功能域的人 galect inl5, 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 galectinl5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 galectinl5的多核苷酸转移至细胞内。 构建携带编码人 galect inl5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 galeCtinl5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。
抑制人 galectinl5 mRNA的寡核苷酸(包括反义 RNA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 DM及核酶可用已有的任何 RNA或 DM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 DM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 galectinl5的多核苷酸可用于与人 galectinl5的相关疾病的诊 断。 编码人 galectinl5的多核苷酸可用于检测人 galect inl5的表达与否或在 疾病状态下人 galectinl5的异常表达。 如编码人 galectinl5的 DM序列可用 于对活检标本进行杂交以判断人 galectinl5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 galeCtinl5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 galectinl5的转 录产物。
检测人 galectinl5基因的突变也可用于诊断人 galectinl5相关的疾病。 人 galectinl5突变的形式包括与正常野生型人 galectinl5 DM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(FISH), 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
Manual of Basic Techniques, Pergamon Press, 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.Mckusick,Mendelian Inheritance in Man (可通过与 Johns Hopkins University Welch Medical Library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未观察 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 galectinl5 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 galectinl5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。
实施例
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 galectinl5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 | 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 DH5a, 细菌形成 cDNA文库。 用 Dye terminate cycle reaction sequencing ki t (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 cD 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 0484E08的 cDM序列为新的 DNA。 通过合成一系列引物对该克隆所含的插入 cDM片 段进行双向测定。 结果表明, (M84E08克隆所含的全长 cDNA为 755bp (如 Seq IDN0:l 所示) , 从第 225bp至 6 bp有一个 419bp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-0484E08, 编码的蛋白 质命名为人 galectinl5。 实施例 2 cDNA 克隆的同源检索
将本发明的人 galectinl5的序列及其编码的蛋白序列, 用 Blast程序(Bas ic local alignment search tool) [Al tschul, 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 galectinl5同源性最高的基因是一种已知的人 galectinlO, 其编码 的蛋白在 Genbank的准入号为 AC005393。 蛋白质同源结果示于图 1, 两者高度同源, 其相同性为 50%; 相似性为 68%。 实施例 3 用 RT- PCR方法克隆编码人 galectinl5的基因
用胎脑细胞总 RNA为模板,以 ol igo- 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'-GGCTGCATTACAGACACAGACCTG-3' (SEQ ID NO: 3)
Primer2: 5,- GTTTGGTGCTGTTTTAATGATCAT- 3, (SEQ ID NO: 4)
Priraerl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 50μ 1的反应体积中含有 50mmol/L KC1, 10mmol/L Tris- Cl, (pH8.5), 1.5mmol/L MgCl2, 200 μ mol/L dNTP, lOpmol引物, 1U的 Taq D 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: 94°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 (Invitrogen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- 775bp完全相同。 实施例 4 Northern 印迹法分析人 galectinl5基因的表达
用一步法提取总 RNA [Anal. Biochem 1987, 162, 156-159] 0 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 20yg RNA, 在含 20mM 3- (N- 吗啉代) 丙磺酸(PH7.0) -5mM乙酸钠 - ImM 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 a-32P dATP通过随机引物法制备 32Ρ-标记 的 DM探针。所用的 DM探针为图 1所示的 PCR扩增的人 galectinl5编码区序列(225bp 至 644bp)。 将 32P-标记的探针 (约 2 x l00cpm/ml ) 与转移了 RNA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 SSC- 5xDenhardt,s溶液和 200 g/ml鮭精 DNA。 杂交之后, 将滤膜在 1 χ SSC-0.1%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 galectinl5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,- CCCCCATGGATGTCATCACTACCCGTACCATAC-3' ( Seq ID No: 5 ) Primer4: 5 '-CATGGATCCCCATCGCTGATAAGCACTCTGGTC-3 ' (Seq ID No: 6 ) 此两段引物的 5'端分别含有 Ncol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, Nco I和 BamH I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- 0484E08质粒为模板, 进行 PCR反应。 PCR反应条件为: 总体积 50μ1 中含 pBS- 0484Ε08质粒 10pg、 引物 Primer- 3和 Priraer- 4分别为 lOpmol Advantage polymerase Mix ( Clontech公司产品) 1μ1。 循环参数: 94 C 20s, 60°C 30s, 68°C 2 min,共 25个循环。 用 Ncol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 DH5C , 在含卡那霉素 (终浓度 30 g/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-0484E08)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 Mg/ml) 的 LB液体培养基中, 宿主菌 BL21 ( pET- 0484E08 )在 37°C培养至对数生长 期, 加入 IPTG至终浓度 1 ol/L, 继续培养 5小时。 离心收集菌体, 经超声波破菌, 离心收集上清液, 用能与 6个组氨酸( 6His-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 galectinl5 经 SDS-PAGE电泳, 在 15kDa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 galectinl5抗体的产生
用多肽合成仪(PE公司产品) 合成下述人 galectinl5特异性的多肽:
NH2-Met-Ser-Ser-Leu-Pro-Val-Pro-Tyr-Thr-Leu-Pro-Val-Ser-Leu-Pro-COOH (SEQ ID N0:7)。 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 al. Immunochemistry, 1969; 6: 43。 用 ½g上述血蓝蛋白多肤复 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 Sephar0Se4B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 galectinl5结合。

Claims

权利要求
1、 一种分离的多肽-人 galectinl5, 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 (a) 或 (b) 有至少(70}%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 NO: 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 {225- 644}位的序列或 SEQ ID NO: 1中 {1-775}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 galectinl5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 galectinl5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 galectinl5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 galeCtinl5 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 galectin15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 11所述化合物的应用, 其特征在于所述化合物用于调 节人 galectinl5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、 如杈利要求 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 galectinl5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。
17、 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 galectinl5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/CN2000/000376 1999-10-28 2000-10-27 Nouveau polypeptide, galectine 15, et polynucleotide codant pour ce polypeptide WO2001030837A1 (fr)

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