WO1999060117A2 - Polypeptide prax-1 - Google Patents
Polypeptide prax-1 Download PDFInfo
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- WO1999060117A2 WO1999060117A2 PCT/FR1999/001070 FR9901070W WO9960117A2 WO 1999060117 A2 WO1999060117 A2 WO 1999060117A2 FR 9901070 W FR9901070 W FR 9901070W WO 9960117 A2 WO9960117 A2 WO 9960117A2
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
- C07K14/46—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates
- C07K14/47—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K48/00—Medicinal preparations containing genetic material which is inserted into cells of the living body to treat genetic diseases; Gene therapy
Definitions
- PRAX-1 polypeptide The invention relates to a new nucleic acid sequence and the corresponding protein sequence.
- the invention also relates to the prophylactic, therapeutic and diagnostic applications thereof.
- the authors of the present invention have identified the transcript of a new gene as well as the corresponding protein.
- This PRAX-1 gene was isolated by the double hybrid technique as coding for a protein interacting specifically with the peripheral benzodiazepine receptor (PBR).
- PBR peripheral benzodiazepine receptor
- the present invention therefore relates to a purified protein PRAX-1, or biologically active fragments thereof.
- the invention also relates to isolated nucleic acid sequences encoding said protein or its biologically active fragments and to specific oligonucleotides obtained from this sequence. It further relates to the cloning and / or expression vectors containing at least one of the nucleotide sequences defined above, and the host cells transfected with these cloning and / or expression vectors under conditions permitting repiication. and / or the expression of one of said nucleotide sequences.
- Methods of producing recombinant PRAX-1 proteins or its biologically active fragments by transfected host cells are also part of the invention.
- the invention also includes antibodies or antibody derivatives specific for the proteins defined above.
- the invention also relates to any inhibitor or activator of the specific activity of PRAX-1, but also of any protein-protein interaction involving PRAX-1.
- oligonucleotide sequences specific for the above nucleic acid sequences, which can modulate the expression of the PRAX-1 gene in vivo. It relates to oligonucleotide sequences defined from the nucleic acid sequences above, probe or primer usable in the diagnosis of pathologies where PRAX-1 is involved.
- the invention finally relates to the use in a method of gene therapy of a nucleotide sequence according to the invention, in which vectors such as for example inactivated viral vectors capable of transferring coding sequences for a protein according to the invention are injected into cells deficient for this protein.
- vectors such as for example inactivated viral vectors capable of transferring coding sequences for a protein according to the invention are injected into cells deficient for this protein.
- the subject of the present invention is a purified polypeptide whose amino acid sequence is the sequence SEQ ID No. 2 or any biologically active sequence derived from SEQ ID No. 2.
- - PRAX-1 protein a polypeptide comprising an amino acid sequence chosen from the sequence SEQ ID No. 2 or any fragment or derivative thereof biologically active.
- - biologically active capable of interacting with the peripheral benzodiazepine receptor.
- immunologically related capable of being recognized by the antibodies specific for the polypeptide of sequence SEQ ID No. 2 and / or capable of inducing antibodies which recognize this polypeptide.
- the manufacture of derivatives can have different objectives, including in particular that of improving its production rates, of increasing its resistance to proteases, of modifying its biological activities or of imparting to it new pharmaceutical and / or biological properties.
- the invention relates to a polypeptide comprising the interaction domain with PBR of one of the preceding polypeptides.
- This domain corresponds to the sequence between residue 1564 and residue 1857 of the sequence SEQ ID No. 2.
- Genban with access number AF039571.
- the present invention also relates to the nucleic acid sequences coding for a PRAX-1 protein or biologically active fragments or derivatives thereof.
- the subject of the invention is isolated nucleic acid sequences chosen from: a) the sequence SEQ ID No. 1, b) the sequence complementary to the sequence SEQ ID No. 1, c) the acid sequences nucleic acid capable of specifically hybridizing to the sequence SEQ ID No. 1 or their complementary sequences, or of hybridizing specifically to their proximal sequences, d) the sequences derived from the sequences a), b) and c), owing to the fact degeneration of the genetic code.
- the subject of the invention is the nucleotide sequence SEQ ID No. 1 corresponding to the cDNA of the human protein of sequence SEQ ID No. 2.
- the different nucleotide sequences of the invention can be of artificial origin or not. They may be DNA or RNA sequences, obtained by screening of sequence banks using probes prepared on the basis of the sequence SEQ ID No. 1. Such libraries can be prepared by conventional techniques. molecular biology, known to those skilled in the art.
- nucleotide sequences according to the invention can also be prepared by chemical synthesis, or also by mixed methods including chemical or enzymatic modification of sequences obtained by screening libraries. These nucleotide sequences allow the production of nucleotide probes, capable of hybridizing strongly and specifically with a nucleic acid sequence, of a genomic DNA or of a messenger RNA, coding for the polypeptide according to the invention or a biologically fragment active of it. Such probes are also part of the invention.
- polypeptides of the invention can be used as an in vitro diagnostic tool for the detection, by hybridization experiments, of specific transcripts of the polypeptides of the invention in biological samples or for the detection of aberrant syntheses or genetic anomalies at the level nucleic acid sequences encoding a polypeptide as defined above such as loss of heterozygosity or genetic rearrangement, resulting from polymorphism, mutations or different splicing.
- a nucleotide probe according to the invention is brought into contact with a biological sample under conditions allowing the formation of a hybridization complex between the probe and the nucleotide sequence of interest, possibly after a preliminary step of amplification of said nucleotide sequence; the hybridization complex possibly formed is detected and the nucleotide sequence forming the hybridization complex with the probe of the invention is optionally sequenced.
- the nucleotide sequences of the invention can also be used for the manufacture of a medicament useful in gene therapy.
- the probes of the invention comprise at least 10, preferably at least 16 nuciototides, and at most comprise the entire sequence of the PRAX-1 gene or of its cDNA contained for example in a cosmid.
- the appropriate hybridization conditions correspond to the stringent conditions usually used by those skilled in the art, in particular of high stringency as defined by Sambrook et al. in Molecular Cloning, a laboratory manual, 2 edition,
- the temperature used is preferably between T m -5 ° C to T m -30 ° C, more preferably between Tm -5 ° C and T m -10 ° C, T being the temperature melting point, the temperature at which 50% of the paired DNA strands separate.
- the hybridization conditions used are as follows - temperature: 65 ° C., - hybridization buffer: BSA 1%, SDS 7% NaH2 ⁇ 4 0.5M, EDTA 1 mM, as described in the example VII.
- these probes are represented by the following oligonucleotides as well as the corresponding complementary sequence nucleotides:
- SEQ ID No. 20 TCC GGG TCA CAG GCT ATG CCA T
- SEQ ID No. 26 CCA GTG AGG TAG AGG AGC TGG
- SEQ ID No. 27 TCC ATT CCC CAG CCT TGC CGG GG
- SEQ ID No. 28 GCT CGA AGA ACA GTG CCG CAG CC
- SEQ ID # 30 GCT GGA ATC GGA GCT CAG CAA G
- SEQ ID No. 36 ATG GAG CCA TGG GCA CTG CCC
- the probes of the invention are marked, prior to their use. For this, several techniques are within the reach of those skilled in the art
- the in vitro diagnostic methods in which these nucleotide probes are used are included in the subject of the present invention. These methods relate, for example, to the detection of abnormal syntheses (eg accumulation of transcripts) or genetic abnormalities, such as loss of heterozygosity and genetic rearrangement, and point mutations in the nucleotide sequences of nucleic acids. coding for a protein
- nucleotide sequences of the invention are also useful for the manufacture and use of oligonucleotide primers for specific sequencing or amplification reactions according to the so-called PCR technique or any variant thereof (Ligase Chain Reaction (LCR) ), .
- Preferred pairs of primers are constituted by primers advantageously of at least 16 nucleotides, chosen from the nucleotide sequence:
- SEQ ID No. 1 human sequence of 7033 nuciotides.
- these primers are represented by the following pairs: - couple n ° 1: sense primer: GCT CTG TTT GAC TAT GAC CC (SEQ ID n ° 3) antisense primer: AAC TTG AAT CCA ATG AGC AA (SEQ ID n ° 4)
- sense primer TCT GCT GAC CTG AAA GCT CC (SEQ ID n ° 5)
- antisense primer TCC TCC TGA GGA GCT GCT TC (SEQ ID n ° 8)
- sense primer TTG ACC AAG GTC ACT GAG CC (SEQ ID n ° 10) antisense primer: AAC TTG AAT CCA ATG AGC AA (SEQ ID n ° 4)
- sense primer GCT CTG TTT GAC TAT GAC CC (SEQ ID n ° 3) antisense primer: GCC ATC GGC ATC CTT GTC CC (SEQ ID n ° 12)
- sense primer GCT CTG TTT GAC TAT GAC CC (SEQ ID n ° 3)
- antisense primer TCC TCC TGA GGA GCT GCT TC (SEQ ID n ° 8) "sense" primers ranging from 5 'to 3 'and the 3' to 5 '"anti-sense” primers.
- PRAX-1 as a new protein can be considered according to the invention as a new element integrating gene therapy.
- the nucleotide sequences encoding the PRAX-1 protein can be transferred to target cells via inactivated viral vectors.
- the prospect of using this protein in a gene therapy treatment comes first from the chromosomal localization of the human gene coding for this protein. Located on chromosome 17 in the q22-q23 region, this gene is associated with markers of serious pathologies affecting the central nervous or immune system (neuroblastomas or leukemias).
- this protein in gene therapy is also entirely possible according to the invention if we consider the particular expression of this protein associated with three major systems in the body: - the central nervous system, the expression of this new protein is predominant in the brain. Its expression is associated with certain well-defined brain regions.
- the expression profile of the protein in the thymus is quite remarkable.
- nucleotide sequences according to the invention can moreover be used for the production of PRAX-1 recombinant proteins, according to the definition which has been given to this term.
- proteins can be produced from the nucleotide sequences defined above, according to techniques for the production of recombinant products known to those skilled in the art.
- the nucleotide sequence used is placed under the control of signals allowing its transcription and expression in a cellular host.
- An efficient system for producing a recombinant protein requires a vector, for example of plasmid or viral origin, and a compatible host cell.
- the cell host can be chosen from prokaryotic systems, such as bacteria, or eukaryotic systems, such as, for example, yeasts, insect or mammalian cells, in particular CHO (Chinese hamster ovary cells) or any other system advantageously available.
- a preferred cellular host for the expression of the proteins of the invention consists of the bacterium E. coli, in particular the strain MC 1061 (Clontech).
- the vector must include a promoter, translation initiation and termination signals, as well as the appropriate regions for transcription regulation. It must be able to be maintained stably in the cell and may possibly have particular signals specifying the secretion of the translated protein. These different control signals are chosen according to the cellular host used.
- nucleotide sequences according to the invention can be inserted into vectors with autonomous replication within the chosen host, or integrative vectors of the chosen host.
- vectors will be prepared according to the methods commonly used by those skilled in the art, and the resulting clones can be introduced into an appropriate host by standard methods, such as, for example, electroporation.
- Cloning and / or expression vectors containing at least one of the nucleotide sequences defined above also form part of the present invention.
- a cloning and expression vector used is the plasmid pZeoSV2 (+) (Invitrogen, V850-01) which contains both the elements necessary for its use as a cloning vector in E. coli (origin of replication in E. coli and Zeocin resistance gene), and as an expression vector in animal cells (promoter, polyadenylation signal, origin of replication of the SV40 virus), as well as the elements allowing its single-strand copying for the purpose of sequencing ( origin of replication of phage f1).
- the proteins of the invention are in the form of fusion proteins, in particular in the form of protein fused with glutathione S-transferase (GST).
- GST glutathione S-transferase
- An expression vector designated in this case is represented by the plasmid vector pGEX-4T-2 (Pharmacia ref-27.4581 -01).
- the invention further relates to host cells transfected with these preceding vectors. These cells can be obtained by introducing into host cells a nucleotide sequence inserted into a vector as defined above, then culturing said cells under conditions allowing replication and / or expression of the transfected nucleotide sequence.
- These cells can be used in a method for producing a recombinant polypeptide of sequence SEQ ID No. 2 or any fragment or biologically active derivative thereof.
- the method for producing a polypeptide of the invention in recombinant form is itself included in the present invention, and is characterized in that the transfected cells are cultured under conditions allowing the expression of a recombinant polypeptide of sequence SEQ ID No. 2 or any biologically active fragment or derivative thereof, and that said recombinant polypeptide is recovered.
- the purification methods used are known to those skilled in the art.
- the recombinant polypeptide can be purified from cell lysates and extracts, from the culture medium supernatant, by methods used individually or in combination, such as fractionation, chromatography methods, immunoaffinity techniques using '' specific mono or polyclonal antibodies, etc.
- a preferred variant consists in producing a recombinant polypeptide fused to a "carrier" protein (chimeric protein).
- carrier chimeric protein
- the polypeptides of the invention are fused with glutathione S-transferase in the N-terminal position ("GST" Pharmacia system).
- GST glutathione S-transferase
- the fusion product is in this case detected and quantified thanks to the enzymatic activity of GST.
- the color reagent used is a glutathione acceptor, a substrate for GST.
- the recombinant product is purified on a chromatography support to which glutathione molecules have previously been coupled.
- Mono or polyclonal antibodies specifically directed against a PRAX-1 protein according to the definition given above also form part of the invention.
- Polyclonal antibodies can be obtained from the serum of an animal immunized against the protein, produced for example by genetic recombination according to the method described above, according to the usual procedures.
- the monoclonal antibodies can be obtained according to the conventional method of culture of hybridomas described by Kôhler and Milstein, Nature, 1975, 256, 495-497.
- Advantageous antibodies are antibodies directed against epitopes located in the region between residue 1564 and residue 1857 for the sequence SEQ ID No. 2.
- the antibodies according to the invention can be in the form of immunoconjugates or labeled antibodies.
- the antibodies of the invention in particular the monoclonal antibodies, can also be used for the detection of these polypeptides in a biological sample. They thus constitute a means of immunocytochemical or immunohistochemical analysis of the expression of the protein PRAX-1 on sections of specific tissues, for example by immunofluorescence, gold labeling, enzyme immunoconjugates.
- the antibodies of the invention can be advantageously used in any situation where the expression of a PRAX-1 protein must be observed.
- the invention therefore also relates to a method of in vitro diagnosis of pathological conditions correlated with an abnormal expression or accumulation of PRAX-1 proteins, from a biological sample, characterized in that at least one contact is made an antibody of the invention with said biological sample, under conditions allowing the possible formation of specific immunological complexes between a PRAX-1 protein and the said antibody or antibodies and in that the specific immunological complexes possibly formed are quantitatively detected.
- the invention also relates to a kit for the in vitro diagnosis of an abnormal expression or accumulation of the protein PRAX-1 in a biological sample and / or for the measurement of the level of expression thereof in said sample comprising: - at least one antibody specific for the PRAX-1 protein, optionally attached to a support,
- the invention also relates to any method of diagnosis by the demonstration in the serum of an individual, of autoantibodies directed against the protein PRAX-1.
- Such an early diagnosis method is characterized in that a serum sample taken from an individual is brought into contact with a polypeptide of the invention, optionally attached to a support, under conditions allowing the formation of specific immunological complexes between said polypeptide and the autoantibodies possibly present in the serum sample, and in that the specific immunological complexes possibly formed are detected.
- the PRAX-1 protein can indeed be considered as a diagnostic element for pathologies occurring in the systems where it is expressed and finds its functionality, in particular the immune, central nervous and endocrine systems.
- the invention also relates to a method for determining an allelic variability, a mutation, a deletion, an insertion, a loss of heterozygosity or a genetic abnormality of the PRAX-1 gene. , which can be involved in pathologies, characterized in that it uses at least one nucleotide sequence described above.
- a method comprising a preferred method is preferred.
- the PRAX-1 protein can finally be envisaged according to the invention as a new pharmacological target by its function involving the peripheral benzodiazepine receptor (PBR). It can in fact be the target of molecules defined to interfere, to modulate the ability of this protein to interact with PBR and thus modify its function.
- PBR peripheral benzodiazepine receptor
- the invention also includes pharmaceutical compositions comprising as active ingredient a polypeptide corresponding to the preceding definitions, preferably in soluble form, associated with a pharmaceutically acceptable vehicle.
- compositions are intended to be administered to subjects having an expression deficient in protein PRAX-1, associated with pathological conditions or having a pathological condition involving PRAX-1 or its receptor.
- the pharmaceutical compositions of the invention may also contain an inhibitor or inactivator of the activity of PRAX-1 and of any protein-protein interaction involving PRAX-1, in particular a polypeptide derived from a polypeptide as defined above.
- compositions can be administered systemically, preferably intravenously, intramuscularly, intradermally or orally.
- dosages and dosage forms can be determined according to the criteria generally taken into account in establishing a therapeutic treatment adapted to a patient such as for example the patient's age or body weight, the severity of general condition, tolerance to treatment and observed side effects, etc.
- the double hybrid technique is a method of cloning by interaction in vivo in the yeast Saccharomyces cerevisiae.
- the object of this technique is to detect protein-protein interactions in vivo and search for the protein partners of a given protein used as bait.
- the bait used is defined on the protein sequence of PBR. Definition of PBR bait should be limited to regions hydrophilic protein according to the constraints of the double hybrid technique. As the PBR protein is strongly hydrophobic, with 5 transmembrane regions, located on the external mitochondrial membrane, we define the PBR bait from the C-terminal motif of the protein, a region demonstrated cytosolic and accessible to possible protein partners by l existence of an anti-PBR monoclonal antibody directed against this region of the protein. A PBR bait constructed on the basis of this C-terminal motif, by juxtaposition three times of the 14 C-terminal amino acids of PBR was selected.
- the PBR bait is a synthetic construct which juxtaposes three times the C-terminal motif of PBR, domain aa156 to 169, separated by glycine linkers: protein sequence bait:
- the nucleotide sequence coding for the PBR bait is cloned into the vector pGBT9 (Clontech) at EcoRI and Xhol sites.
- the HF7c line is first transformed by the bait plasmid then by the chosen fusion bank (fetal brain, Matchmaker library, Clontech) according to the method defined by Schiestl et al. Curr. Genet., 1989, 16, 339-346.
- the double hybrid screening is carried out on 2.10 cells.
- the HIS + and LacZ + clones are identified and tested for their specificity by replacing the PBR bait with other non-relevant constructions. Selection and specificity tests, carried out under the conditions defined in
- the insert contained in each of the clones is sequenced with the ABI PRISM Dye Terminator cycle sequencing Ready reaction Kit, according to the instructions defined in the protocol of use, on an Applied sequencer.
- Biosystems model 373A The 4 clones contain an identical 2152bp sequence containing a polyA tail, a STOP codon, unknown in the databases.
- PRAX-1 for Peripheral benzodiazepine Receptor Associated Protein 1.
- the sequence isolated by double hybrid encodes a polypeptide of 294 amino acids and is incomplete: it lacks the ATG codon coding for the initial methionine in 5 ′. Obtaining the complete sequence of PRAX-1 is described in Example II.
- the selected library is a lamda Zap cDNA frontal cortex library
- the bank clones are spread on LB agar medium, 0.2% maltose, 10 mM MgSO 4 (150 diameter petri dishes) coated with Hybond membranes (Amersham). After one night at 37 ° C., the clones are transferred by contact to new membranes. The latter are treated by placing them on Whatman 3 mm paper soaked with the following solutions: NaOH 0.5 N, NaCI 1.5 M for 2 minutes then Tris HCI 0.5 M pH 8, NaCI 1.5 M for 5 minutes, finally 30 sec on Tris HCI 0 , 2M pH 7.5, SSC 2X. The membranes are dried and then incubated in a vacuum oven at 80 ° C for 2 hours. c) Preparation of PRAX-1 probes
- the probes are labeled with P using the RTS Rad Prime DNA labeling System kit (Gibco BRL). The probes are prepared o with a specific activity of 5 10 dpm / ⁇ g on average. d) Prehybridization and hybridization
- the membranes prepared in b) are prehybridized for 30 minutes at 42 ° C in 6 x SSC, 5 x Denhart's, 0.1% SDS and then hybridized overnight in the same buffer supplemented with the probe prepared in c) at a rate of 10 6 dpm / ml. e) Washing and exposure of membranes
- the membranes are washed twice at room temperature in the buffer 2 x SSC / SDS 0.1% then one hour at 56 ° C in 6 x SSC / SDS 0.1%.
- the hybrid clones are revealed by autoradiography and selected after multiple screening.
- the sequential screening of the lambda Zap library made it possible to isolate clones containing the cDNA coding for the whole protein PRAX-1.
- the sequence is obtained using the ABI PRISM Dye Terminator cycle sequencing Ready reaction Kit, according to the instructions defined in the operating protocol, on the Applied Biosystems model 373A sequencer.
- the complete nucleotide sequence coding for PRAX-1 is 7033 bp, presented in the appendix. It codes for a polypeptide of 1857 amino acids, of molecular weight 200 kDa.
- the portion isolated by double hybrid is the C-terminal end of 294 C-terminal amino acids, corresponding on the coding sequence SEQ ID No. 1 to the region 4887 to 7033.
- the portion of PRAX-1 isolated in the double screening hybrid is referenced PRAX-1 (2H) and corresponds to the domain extending from amino acids 1564 to 1857 in SEQ ID No. 2.
- a recombinant clone was cultured at 37 ° C. in one liter of LB culture medium (bacterotryptone 10 g / l, yeast extract 5 g / l, NaCl 10 g / I) + ampicillin 100 ⁇ g / ml.
- LB culture medium bacterotryptone 10 g / l, yeast extract 5 g / l, NaCl 10 g / I
- the expression is induced with 0.5mM IPTG for 2 h at 37 ° C.
- the cell pellet is taken up in cold PBS and then sonicated by ultrasound. After centrifugation at 12000 g, for 10 min at 4 ° C, the supernatant is recovered.
- the purification is then carried out on a glutathione sepharose 4B affinity chromatography column. Fixation and washing are carried out in PBS buffer and elution is carried out by competition with reduced glutathione.
- Jurkat cells are transfected by electroporation using the Biorad Gene Module device (Biorad), 320V, 250 ⁇ Fr, 5ms.
- Biorad Biorad Gene Module device
- the selection of the transfected clones is carried out with Zéocin 500 ⁇ g / ml in RPMI 1640 medium, 20% FCS.
- the transfected cells are cultured in RPMI1640 medium, 20% FCS, Zéocin 500 ⁇ g / ml.
- the production of recombinant HA-PRAX-1 (2H) protein is verified using the anti-HA (Boerhinger Mannheim) or anti-PRAX-1 antibody.
- Immunogenic peptides of 20 amino acids are selected from the protein sequence PRAX-1 SEQ ID No. 2, in the hydrophilic portions of the protein. 5 mg of each KLH coupled peptide are used to immunize 2 rabbits (male from 1.5 to 2 kg approximately, New Zealand). Four immunizations were carried out 15 days apart according to the protocol described by Vaitukaitis, Methods in enzymology, 1981, 73, 46. The sera are collected one month after the first immunization then 2 times successively at 1 month and 15 days after interval. Each serum collected is tested in western immunoblotting for the recognition of the PRAX-1 protein. The immune sera are purified on an Affigel affinity column (Biorad).
- the cell lines were cultivated, as described in the "Catalog of cell lines and hybridomas, 7th edition, 1992" of the ATCC (American Type Culture Collection).
- Human lines U373 (astrocyte line), SHSY5Y (neuroblastoma), NHA (normal astrocytes), Jurkat, Molt-4 (T leukemia), Daudi, U937 (B lymphoma), SW480 (colon adenocarcinoma), DU145 (prostatic carcinoma) , Hacat, SVK14, WS1, NCTC2544, A431, VA ES BJ (keratinocytes).
- Murine line J744-A1 (monocytes-macrophage).
- Rat line C62b (Glioma).
- PRAX-1 (2H) is prepared as a reticulocyte lysate with the TNT T7 / T3 Coupled reticulocyte Lysate System kit (Promega ref. L5010) according to the protocol of use defined in the kit.
- the plasmid used in this system is a plasmid pBluescript-PRAX-1 (2H) constructed by insertion of the coding sequence for PRAX-1 (2H) (nuciéotides 4887 to 7033 on SEQ ID No. 1) in the vector pBluescript (Stratagene) in BamHI site.
- the cells are washed with PBS and then lysed in the lysis buffer (6M urea, 50mM Tris HCl pH 6.8, 2% SDS, 10% glycerol, 100mM DTT, 0.1% bromophenol blue).
- the lysates are sonicated by ultrasound at 4 ° C for 2 min, heated 10 min at 100 ° C and stored at -20 ° C.
- the samples calibrated for their protein content are deposited on 4-12% or 4-20% SDS-PAGE gel and then electrotransfered onto a nitrocellulose membrane.
- the membrane is incubated for at least 1 h in TBST blocking buffer (Tris HCI 10mM pH 8, NaCl 150mM, 0.1% Tween 20) added with 10% milk at room temperature.
- TBST blocking buffer Tris HCI 10mM pH 8, NaCl 150mM, 0.1% Tween 20
- the membrane is successively placed in the presence of the anti-PRAX-1 antibody in the same buffer, for 3 h at room temperature, washed 3 times for 10 min with TBST, then incubated for 45 min with a second anti-immunoglobulin antibody.
- SIGMA rabbit coupled to peroxidase
- Figure in annex The immunoblots obtained with the anti-PRAX-1 antibody show that it specifically recognizes the recombinant proteins and endogenous. Analysis of human cell lines shows an expression of the PRAX-1 protein detected in all of the lines tested.
- the chromosomal localization of the PRAX-1 gene was carried out by in situ hybridization according to the procedure described by Heng et al. Proc. Natl Acad. Sci. USA (1992), 89, 9509-9513 and Chromosoma (1993), 102, 325-332.
- the cDNA probe used is a 3.5Kb probe defined on the sequence SEQ ID No. 1, comprising the 3 ′ end of the cDNA isolated by double hybrid. 100 mitoses were analyzed, 73 mitotic images show double spots located on a pair of chromosomes. The results make it possible to locate the PRAX-1 gene in the q22-q23 region on chromosome 17.
- the results show a majority expression of the PRAX-1 transcript in the human brain.
- the visible majority transcript is 7.5Kb in agreement with the size of the cDNA determined after screening of the cDNA libraries.
- the PRAX-1 transcript therefore exhibits strong expression in the central nervous system, with expression varying according to the regions of the brain.
- the thymus and the pituitary gland are distinguished from other tissues where expression is weaker.
- the fetal brain gives a strong signal, followed by the heart, kidney, thymus, and lung.
- EXAMPLE 9 The PRAX-1 / PBR interaction was demonstrated in animals by the co-localization of PRAX-1 and PBR in the thymus, the adrenal gland and the skin.
- the promoter of the human gene encoding PRAX-1 is known. Its characterization reveals the existence of potential sites for regulating the expression of PRAX-1.
- the human PRAX-1 gene is around 26Kb and is divided into 32 exons separated by 31 introns, the size of the exons varies from 21 to 840bp while the size of the introns ranges from 79 to 3300bp.
- the 2.6Kb analysis preceding the translation initiation site shows the presence of potential modulation sites for gene transcription: 3 Sp 1 sites, 1 AP-1 site, 3 AP-2 sites, 2 SRE, 10 GRE, 1 Zre site, 15 CACCC sites, 5 CT boxes and binding sites for different regulatory factors MAZ (two), C / EBP ⁇ (one), c-Ets-2 (one), Puf (three), GATA -1 (one), MyoD (one), USF (three), GC rich binding factor (one), SRY (three) and SOX-5 (one).
- Sp1 sites are part of the basic transcription machinery and provide a level of expression. Growth factors can modulate the expression of PRAX-1 through the SRE sites.
- AP-2 sites are involved in particular during the development of the central nervous system, proliferation and oncogenesis phenomena.
- GRE sites are glucocorticoid response sites and are either activators or repressors. They frequently act in conjunction with other related factors. USF is an activator of ubiquitous transcription.
- Puf is involved in the removal of tumors.
- the CACCC sites have in particular been described active on blood cells.
- the factor C / EBPcc is involved in energy phenomena, cell multiplication and differentiation.
- Other factors have specific expressions: MyoD is involved in myogenesis, MAZ, GATA-1, c-ets-2 are involved in hematopoiesis and lymphocyte maturation, the SRY and SOX-5 sites are particularly active during development and embryogenesis.
- a construct is also available containing a PRAX-1 mouse insert of 1410 bp corresponding to the N terminal end of PRAX-1, cloning into the vector pcDNA3.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU35285/99A AU3528599A (en) | 1998-05-15 | 1999-05-06 | Prax-1 polypeptide |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9806190A FR2778665B1 (fr) | 1998-05-15 | 1998-05-15 | Polypeptide prax-1 |
| FR98/06190 | 1998-05-15 |
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| Publication Number | Publication Date |
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| WO1999060117A2 true WO1999060117A2 (fr) | 1999-11-25 |
| WO1999060117A3 WO1999060117A3 (fr) | 2000-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR1999/001070 Ceased WO1999060117A2 (fr) | 1998-05-15 | 1999-05-06 | Polypeptide prax-1 |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU3528599A (fr) |
| FR (1) | FR2778665B1 (fr) |
| WO (1) | WO1999060117A2 (fr) |
-
1998
- 1998-05-15 FR FR9806190A patent/FR2778665B1/fr not_active Expired - Fee Related
-
1999
- 1999-05-06 AU AU35285/99A patent/AU3528599A/en not_active Abandoned
- 1999-05-06 WO PCT/FR1999/001070 patent/WO1999060117A2/fr not_active Ceased
Non-Patent Citations (10)
| Title |
|---|
| B. BIREN ET AL.: "Homo sapiens chromosome 17, clone hRPC.1171_I_10, complete sequence" EMBL SEQUENCE DATABASE, 15 mai 1998 (1998-05-15), XP002090577 Cambridge, UK * |
| D. LIN ET AL.: "The human peripheral benzodiazepine receptor gene: cloning and characterization of alternative splicing in normal tissues and in a patient with congenital lipoid adrenal hyperplasia" GENOMICS, vol. 18, no. 3, décembre 1993 (1993-12), pages 643-650, XP002090580 ACADEMIC PRESS INC., NY, US * |
| GAVISH ET AL: "Biochemical, Physiological, and Pathological Aspects of the Peripheral Benzodiazepine Receptor" JOURNAL OF NEUROCHEMISTRY, vol. 5, no. 58, 1992, page 1589 1589 XP002076143 * |
| J. NIE ET AL.: "Interacxtion of Oct-1 and automodification domain of poly(ADP-ribose) synthetase" FEBS LETTERS, vol. 424, no. 1-2, 6 mars 1998 (1998-03-06), pages 27-32, XP002090583 ELSEVIER, AMSTERDAM, NL * |
| J. RIOND ET AL.: "Molecular cloning and chromosomal localization of a human peripheral-type benzodiazepine receptor" EUR. J. BIOCHEM., vol. 195, no. 2, 30 janvier 1991 (1991-01-30), pages 305-311, XP002090581 SPRINGER, BERLIN, D * |
| K.-ICHI ISHIKAWA ET AL.: "Prediction of the coding sequences of unidentified human genes. X. The complete sequence of 100 new cDNA clones from brain which can code for large proteins in vitro" DNA RESEARCH, vol. 5, 30 juin 1998 (1998-06-30), pages 169-176, XP002090578 KAZUSA DNA RES. UNIV.ACAD.PRESS,INC.,TOKYO,JP & O. OHARA ET AL.: "Homo sapiens mRNA for KIAA0612 protein, partial cds.," EMBL SEQUENCE DATABASE, 15 juillet 1998 (1998-07-15), Cambridge, UK * |
| PAPADOPOULOS V ET AL: "Peripheral benzodiazepine receptor in cholesterol transport and steroidogenesis" STEROIDS: STRUCTURE, FUNCTION, AND REGULATION, vol. 62, no. 1, janvier 1997 (1997-01), page 21-28 XP004054224 * |
| R. FARGES ET AL.: "Molecular basis for the different binding properties of benzodiazepines to human and bovine peripheral-type benzodiazepine receptors" FEBS LETTERS, vol. 335, no. 3, décembre 1993 (1993-12), pages 305-308, XP002090582 ELSEVIER, AMSTERDAM, NL * |
| S. GALIÈGUE ET AL.: "Cloning and characterization of rax-1" J. BIOL. CHEM., vol. 274, no. 5, 29 janvier 1999 (1999-01-29), pages 2938-2952, XP002122735 AM. SOC. BIOCHEM. MOL.BIOL.,INC.,BALTIMORE,US * |
| S. GALIEGUE ET AL.: "Homo sapiens peripheral benzodiazepine receptor interacting protein mRNA, complete cds.;" EMBL SEQUENCE DATABASE, 6 janvier 1999 (1999-01-06), XP002090579 Cambridge, UK * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1999060117A3 (fr) | 2000-01-20 |
| FR2778665A1 (fr) | 1999-11-19 |
| AU3528599A (en) | 1999-12-06 |
| FR2778665B1 (fr) | 2000-06-30 |
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