EP1131423A1 - Polypeptides et polynucleotides rgs8like, appartenant a la famille des polypeptides regulateurs de la signalisation par la proteine g - Google Patents

Polypeptides et polynucleotides rgs8like, appartenant a la famille des polypeptides regulateurs de la signalisation par la proteine g

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Publication number
EP1131423A1
EP1131423A1 EP00958883A EP00958883A EP1131423A1 EP 1131423 A1 EP1131423 A1 EP 1131423A1 EP 00958883 A EP00958883 A EP 00958883A EP 00958883 A EP00958883 A EP 00958883A EP 1131423 A1 EP1131423 A1 EP 1131423A1
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EP
European Patent Office
Prior art keywords
polypeptide
sequence
polynucleotide
seq
isolated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP00958883A
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German (de)
English (en)
Inventor
David Malcolm SmithKline Beecham Phar Duckworth
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SmithKline Beecham Ltd
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SmithKline Beecham Ltd
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Publication of EP1131423A1 publication Critical patent/EP1131423A1/fr
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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
    • C07K14/4701—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans from vertebrates from mammals not used
    • C07K14/4702—Regulators; Modulating activity

Definitions

  • This invention relates to newly identified polypeptides and polynucleotides encoding such polypeptides, to their use in diagnosis and in identifying compounds that mav be agonists, antagonists that are potentially useful in therapy, and to production of such polypeptides and polynucleotides
  • the present invention relates to RGS8LIKE, in particular RGS8LIKE polypeptides and RGS8LIKE polynucleotides, recombinant materials and methods for their production
  • RGS8LIKE in particular RGS8LIKE polypeptides and RGS8LIKE polynucleotides, recombinant materials and methods for their production
  • Such polypeptides and polynucleotides are of interest in relation to methods of treatment of certain diseases, including, but not limited to neurological conditions such as pain, hereinafter referred to as "diseases of the invention”
  • the invention relates to methods for identifying agonists and antagonists (e g , inhibitors) using the mate ⁇ als provided by the invention, and treating conditions associated with RGS8LIKE imbalance with the identified compounds
  • the invention relates to diagnostic assays for detecting diseases associated with inappropriate RGS8LIKE activity or levels
  • the present invention relates to RGS8LIKE polypeptides
  • Such polypeptides include (a) an isolated polypeptide encoded by a polynucleotide comprising the sequence of SEQ ID NO 1 ,
  • Polypeptides of the present invention are believed to be members of the regulators of G protein signalling family of polypeptides They are therefore of interest because G proteins have an important function in cell signalling pathways These are GTP binding proteins and are heterot ⁇ mers consisting of alpha, beta and gamma subunits When G proteins are inactive, the alpha subumt is bound the beta and gamma subunits and GDP In contrast, when G proteins are active and the signalling pathway is on, the alpha subumt is dissociated form the beta-gamma complex and is bound to GTP Inactivation is accomplished through hydrolysis of the bound GTP to GDP and the rate of hydrolysis determines the time the G protein is active and the duration of the physiological response G proteins are GTPases but the process is accelerated by GTPase activating proteins (GAPs) Regulators of G protein signalling (RGS proteins) act as GAPs They are of interest because some negatively modulate G protein-coupled receptor neurotransrrutter responses in neurons or are involved in the activation and deactiv
  • Polypeptides of the present invention also includes variants of the aforementioned polypeptides, including all allehc forms and splice variants
  • Such polypeptides vary from the reference polypeptide by insertions, deletions, and substitutions that may be conservative or non- conservative, or any combination thereof
  • Particularly preferred variants are those in which several, for instance from 50 to 30, from 30 to 20, from 20 to 10, from 10 to 5, from 5 to 3, from 3 to 2, from 2 to 1 or 1 amino acids are inserted, substituted, or deleted, in any combination
  • Preferred fragments of polypeptides of the present invention include an isolated polypeptide comprising an amino acid sequence having at least 30, 50 or 100 contiguous amino acids from the amino acid sequence of SEQ ID NO 2, or an isolated polypeptide comprising an amino acid sequence having at least 30 50 or 100 contiguous amino acids truncated or deleted from the amino acid sequence of SEQ ID NO 2
  • Preferred fragments are biologically active fragments that mediate the biological activity of RGS8LIKE, including those with a similar activity or an improved activity, or with a decreased undesirable activity
  • Fragments of the polypeptides of the invention may be employed for producing the corresponding full-length polypeptide by peptide synthesis, therefore, these variants may be
  • polypeptides of the present invention may be in the form of the 'mature" protein or may be a part of a larger protein such as a precursor or a fusion protein It is often advantageous to include an additional amino acid sequence that contains secretory or leader sequences, pro-sequences, sequences that aid in purification, for instance multiple histidine residues, or an additional sequence tor stability during recombinant production
  • Polypeptides of the present invention can be prepared in any suitable manner, for instance by isolation form naturally occunng sources, from genetically engineered host cells comp ⁇ sing expression systems (vide infra) or by chemical synthesis, using for instance automated peptide synthesisers, or a combination of such methods Means for preparing such polypeptides are well understood in the art
  • the present invention relates to RGS8LIKE polynucleotides
  • Such polynucleotides include (a) an isolated polynucleotide comp ⁇ sing a polynucleotide sequence having at least 957c, 967c, 977c, 987o, or 997o identity to the polynucleotide squence of SEQ ID NO 1 ,
  • polynucleotide having or comprising a polynucleotide sequence encoding a polypeptide sequence that has an Identity Index of 0 95, 0 96, 0 97 0 98 or 0 99 compared to the polypeptide sequence of SEQ ID NO 2, and polynucleotides that are fragments and variants of the above mentioned polynucleotides or that are complementary to above mentioned polynucleotides, over the entire length thereof
  • Preferred fragments of polynucleotides of the present invention include an isolated polynucleotide comprising an nucleotide sequence having at least 15 30, 50 or 100 contiguous nucleotides trom the sequence of SEQ ID NO 1 or an isolated polynucleotide comprising an sequence having at least 30, 50 or 100 contiguous nucleotides truncated or deleted from the sequence of SEQ ID NO 1
  • va ⁇ ants of polynucleotides of the present invention include splice va ⁇ ants, alle c va ⁇ ants, and polymorphisms, including polynucleotides having one or more single nucleotide polymorphisms (SNPs)
  • Polynucleotides of the present invention also include polynucleotides encoding polypeptide va ⁇ ants that compnse the amino acid sequence of SEQ ID NO 2 and in which several, for instance from 50 to 30 from 30 to 20, from 20 to 10, from 10 to 5, from 5 to 3, from 3 to 2, from 2 to 1 or 1 ammo acid residues are substituted, deleted or added, in any combination
  • the present invention provides polynucleotides that are RNA transc ⁇ pts of the DNA sequences of the present invention Accordingly, there is provided an RNA polynucleotide that is RNA transc ⁇ pts of the DNA sequences of the present invention Accordingly, there is provided an RNA polynucleotide that is RNA transc ⁇ pts of the DNA sequences of the present invention Accordingly, there is provided an RNA polynucleotide that
  • (b) is the RNA transc ⁇ pt of the DNA sequence encoding the polypeptide of SEQ ID NO 2,
  • (c) comprises an RNA transc ⁇ pt of the DNA sequence of SEQ ID NO 1, or
  • (d) is the RNA transc ⁇ pt of the DNA sequence of SEQ ID NO 1 , and RNA polynucleotides that are complementary thereto
  • the polynucleotide sequence of SEQ ID NO 1 shows homology with rat RGS8 (O Saitoh et al , Nature 390 525-529, 1997)
  • the polynucleotide sequence of SEQ ID NO 1 is a cDNA sequence that encodes the polypeptide of SEQ ID NO 2
  • the polynucleotide sequence encoding the polypeptide of SEQ ID NO 2 may be identical to the polypeptide encoding sequence of SEQ ID NO 1 or it may be a sequence other than SEQ ID NO 1, which, as a result of the redundancy (degeneracy) of the genetic code, also encodes the polypeptide of SEQ ID NO 2
  • the polypeptide of the SEQ ID NO 2 is related to other proteins of the regulators of G protein signalling family, having homology and/or structural simila ⁇ ty with rat RGS8 (O Saitoh et al , Nature 390 525-529, 1997)
  • Preferred polypeptides and polynucleotides of the present invention are expected to have inter alia, similar biological functions/properties to their homologous polypeptides and polynucleotides Furthermore, preferred polypeptides and polynucleotides of the present invention have at least one RGS8LIKE activity
  • Polynucleotides of the present invention may be obtained using standard cloning and screening techniques from a cDNA library de ⁇ ved from mRNA in cells of human testes, (see for instance, Sambrook et al , Molecular Cloning A Laboratory Manual, 2nd Ed , Cold Sp ⁇ ng Harbor
  • Polynucleotides of the invention can also be obtained from natural sources such as genomic DNA hbra ⁇ es or can be synthesized using well known and commercially available techniques.
  • the polynucleotide may include the coding sequence for the mature polypeptide, by itself, or the coding sequence for the mature polypeptide in reading frame with other coding sequences, such as those encoding a leader or secretory sequence, a pre-, or pro- or prepro- protein sequence, or other fusion peptide portions
  • a marker sequence that facilitates pu ⁇ fication of the fused polypeptide can be encoded.
  • the marker sequence is a hexa-histidine peptide, as provided in the pQE vector (Qiagen, Inc.) and desc ⁇ bed in Gentz et al., Proc Natl Acad Sci USA ( 1989) 86 821-824. or is an HA tag
  • the polynucleotide may also contain non-coding 5' and 3' sequences, such as transc ⁇ bed, non-translated sequences, splicing and polyadenylation signals, ⁇ bosome binding sites and sequences that stabilize mRNA. Polynucleotides that are identical, or have sufficient identity to a polynucleotide sequence of
  • SEQ ID NO- 1 may be used as hyb ⁇ dization probes for cDNA and genomic DNA or as p ⁇ mers for a nucleic acid amplification reaction (for instance, PCR). Such probes and p ⁇ mers may be used to isolate full-length cDNAs and genomic clones encoding polypeptides of the present invention and to isolate cDNA and genomic clones of other genes (including genes encoding paralogs from human sources and orthologs and paralogs from species other than human) that have a high sequence simila ⁇ ty to SEQ ID NO. l, typically at least 95% identity.
  • Preferred probes and p ⁇ mers will generally comp ⁇ se at least 15 nucleotides, preferably, at least 30 nucleotides and may have at least 50, if not at least 100 nucleotides. Particularly preferred probes will have between 30 and 50 nucleotides.
  • a polynucleotide encoding a polypeptide of the present invention, including homologs from species other than human, may be obtained by a process comp ⁇ sing the steps of screening a library under st ⁇ ngent hyb ⁇ dization conditions with a labeled probe having the sequence of SEQ ID NO 1 or a fragment thereof, preferably of at least 15 nucleotides; and isolating full-length cDNA and genomic clones containing said polynucleotide sequence
  • hyb ⁇ dization techniques are well known to the skilled artisan
  • Preferred st ⁇ ngent hyb ⁇ dization conditions include overnight incubation at 42°C in a solution comp ⁇ sing 50% formamide, 5xSSC (150mM NaCl, 15mM t ⁇ sodium citrate), 50 mM sodium phosphate (pH7.6), 5x Denhardt's solution, 10 % dextran sulf
  • cDNAs have been prepared from mRNA extracted from a chosen tissue and an 'adaptor' sequence hgated onto each end Nucleic acid amplification (PCR) is then earned out to amplify the "missing" 5' end of the cDNA using a combination of gene specific and adaptor specific oligonucleotide pnmers
  • PCR Nucleic acid amplification
  • the PCR reaction is then repeated using 'nested' p ⁇ mers, that is, p ⁇ mers designed to anneal within the amplified product (typically an adaptor specific primer that anneals further 3' in the adaptor sequence and a gene specific primer that anneals further 5' in the known gene sequence)
  • the products of this reaction can then be analysed by DNA sequencing and a full-length cDNA constructed either by joining the product directly to the existing cDNA to give a complete sequence, or carrying out a separate full-length
  • Recombinant polypeptides of the present invention may be prepared by processes well known in the art from genetically engineered host cells comp ⁇ sing expression systems Accordingly, in a further aspect, the present invention relates to expression systems comp ⁇ sing a polynucleotide or polynucleotides of the present invention, to host cells which are genetically engineered with such expression sytems and to the production of polypeptides of the invention by recombinant techniques Cell-free translation systems can also be employed to produce such proteins using RNAs de ⁇ ved from the DNA constructs of the present invention
  • host cells can be genetically engineered to incorporate expression systems or portions thereof for polynucleotides of the present invention
  • Polynucleotides may be introduced into host cells by methods desc ⁇ bed in many standard laboratory manuals, such as Davis et al , Basic Methods in Molecular Biology ( 1986) and Sambrook et al (ibid)
  • Preferred methods of introducing polynucleotides into host cells include, for instance, calcium phosphate transfection, DEAE-dextran mediated transfection, transvection, microinjection, canonic l ⁇ id- mediated transfection, electroporation, transduction, scrape loading, ballistic introduction or infection
  • bacte ⁇ al cells such as Streptococci.
  • E coll. Streptomvces and Bacillus subtilis cells fungal cells, such as yeast cells and Aspergillus cells
  • insect cells such as Drosophda S2 and Spodoptera Sf9 cells
  • animal cells such as CHO, COS, HeLa, C127, 3T3, BHK. HEK 293 and Bowes melanoma cells
  • a great va ⁇ ety of expression systems can be used, for instance, chromosomal, episomal and virus-de ⁇ ved systems, e ?
  • the expression systems may contain control regions that regulate as well as engender expression Generally, any system or vector that is able to maintain, propagate or express a polynucleotide to produce a polypeptide in a host may be used.
  • the appropnate polynucleotide sequence may be inserted into an expression system by any of a va ⁇ ety of well-known and routine techniques, such as, for example, those set forth in Sambrook et al , (ibid)
  • Appropnate secretion signals may be incorporated into the desired polypeptide to allow secretion of the translated protein into the lumen of the endoplasmic reticulum, the pe ⁇ plasmic space or the extracellular environment These signals may be endogenous to the polypeptide or they may be heterologous signals
  • a polypeptide of the present invention is to be expressed for use in screening assays, it is generally preferred that the polypeptide be produced at the surface of the cell In this event, the cells may be harvested p ⁇ or to use in the screening assay If the polypeptide is secreted into the medium, the medium can be recovered in order to recover and purify the polypeptide If produced intracellularly, the cells must first be lysed before the polypeptide is recovered
  • Polypeptides of the present invention can be recovered and pu ⁇ fied from recombinant cell cultures by well-known methods including ammonium sulfate or ethanol precipitation, acid extraction, anion or cation exchange chromatography, phosphocellulose chromatography, hydrophobic interaction chromatography, affinity chromatography, hydroxylapatite chromatography and lectm chromatography Most preferably, high performance liquid chromatography is employed for pu ⁇ fication Well known techniques for refolding proteins may be employed to regenerate active conformation when the polypeptide is denatured dunng intracellular synthesis, isolation and/or pu ⁇ fication
  • Polynucleotides of the present invention may be used as diagnostic reagents, through detecting mutations in the associated gene Detection of a mutated form of the gene characte ⁇ sed by the polynucleotide of SEQ ID NO 1 in the cDNA or genomic sequence and which is associated with a dysfunction will provide a diagnostic tool that can add to, or define, a diagnosis of a disease, or susceptibility to a disease, which results from under-expression, over-expression or altered spatial or temporal expression of the gene Individuals carrying mutations in the gene may be detected at the DNA level by a variety of techniques well known in the art Nucleic acids for diagnosis may be obtained from a subject s cells, such as from blood, u ⁇ ne.
  • the genomic DNA may be used directlv for detection or it may be amplified enzymatically by using PCR, preferably RT-PCR, or other amplification techniques p ⁇ or to analysis RNA or cDNA may also be used in similar fashion
  • Deletions and insertions can be detected bv a change in size of the amplified product in compa ⁇ son to the normal genotype
  • Point mutations can be identified by hyb ⁇ dizing amplified DNA to labeled RGS8LIKE nucleotide sequences Perfectly matched sequences can be distinguished from mismatched duplexes by RNase digestion or by differences in melting temperatures
  • DNA sequence difference may also be detected by alterations in the electrophoretic mobility of DNA fragments in gels, with or without denatu ⁇ ng agents, or by direct DNA sequencing (see, for instance.
  • An array of oligonucleotides probes comp ⁇ sing RGS8LIKE polynucleotide sequence or fragments thereof can be constructed to conduct efficient screening of e g , genetic mutations
  • Such arrays are preferably high density arrays or g ⁇ ds
  • Array technology methods are well known and have general applicability and can be used to address a vanety of questions in molecular genetics including gene expression, genetic linkage, and genetic va ⁇ abihty, see, for example, M Chee et al , Science, 274, 610-613 (1996) and other references cited therein
  • Detection of abnormally decreased or increased levels of polypeptide or mRNA expression may also be used for diagnosing or determining susceptibility of a subject to a disease of the invention Decreased or increased expression can be measured at the RNA level using any of the methods well known in the art for the quantitation of polynucleotides, such as, for example, nucleic acid amplification, for instance PCR,
  • the present invention relates to a diagonostic kit comp ⁇ sing (a) a polynucleotide of the present invention, preferably the nucleotide sequence of SEQ ID NO 1 , or a fragment or an RNA transc ⁇ pt thereof,
  • kits a polypeptide of the present invention, preferably the polypeptide of SEQ ID NO 2 or a fragment thereof, or (d) an antibody to a polypeptide of the present invention, preferably to the polypeptide of SEQ ID NO.2
  • kit may comprise a substantial component
  • Such a kit will be of use in diagnosing a disease or susceptibility to a disease, particularly diseases of the invention, amongst others
  • the polynucleotide sequences of the present invention are valuable for chromosome localisation studies
  • the sequence is specifically targeted to and can hybndize with, a particular location on an individual human chromosome
  • the mapping of relevant sequences to chromosomes according to the present invention is an important first step in correlating those sequences with gene associated disease
  • genetic map data are found in, for example, V McKusick, Mendehan Inhe ⁇ tance in Man (available on-line through Johns Hopkins University Welch Medical Library)
  • the relationship between genes and diseases that have been mapped to the same chromosomal region are then identified through linkage analysis (co-inhentance of physically adjacent genes)
  • Precise human chromosomal localisations for a genomic sequence can be determined using Radiation Hybrid (RH) Mapping (Walter, M
  • polynucleotide sequences of the present invention are also valuable tools for tissue expression studies Such studies allow the determination of expression patterns of polynucleotides of the present invention which may give an indication as to the expression patterns of the encoded polypeptides in tissues, by detecting the mRNAs that encode them
  • the techniques used are well known in the art and include in situ hyd ⁇ disation techniques to clones arrayed on a grid, such as cDNA microarray hyb ⁇ disation (Schena et al.
  • a further aspect of the present invention relates to antibodies
  • the polypeptides of the invention or their fragments, or cells expressing them, can be used as immunogens to produce antibodies that are lmmunospecific for polypeptides of the present invention
  • the term 'lmmunospecific means that the antibodies have substantially greater affinity for the polypeptides of the invention than their affinity for other related polypeptides in the p ⁇ or art
  • Antibodies generated against polypeptides of the present invention may be obtained by administe ⁇ ng the polypeptides or epitope-bea ⁇ ng fragments or cells to an animal, preferably a non- human animal, using routine protocols For preparation of monoclonal antibodies, any technique which provides antibodies produced by continuous cell line cultures can be used Examples include the hybndoma technique (Kohler, G and Milstein, C , Nature (1975) 256 495-497), the t ⁇ oma technique, the human B-cell hybndoma technique (Kozbor et al , Immunology Today (1983) 4 72) and the EBV-hybndoma technique (Cole et al , Monoclonal Antibodies and Cancer Therapy, 77-96, Alan R Liss, Inc , 1985) Techniques for the production of single chain antibodies, such as those desc ⁇ bed in U S
  • Patent No 4,946,778 can also be adapted to produce single chain antibodies to polypeptides of this invention. Also, transgenic mice, or other organisms, including other mammals, may be used to express humanized antibodies
  • antibodies against polypeptides of the present invention may be employed to treat diseases of the invention, amongst others
  • the present invention relates to a method for inducing an immunological response in a mammal that comprises inoculating the mammal with a polypeptide of the present invention, adequate to produce antibody and/or T cell immune response, including for example, cytokine-producing T cells or cytotoxic T cells, to protect said animal from disease, whether that disease is already established within the individual or not
  • An immunological response in a mammal mav also be induced by a method comp ⁇ ses delivering a polypeptide of the present invention via a vector directing expression of the polynucleotide and coding for the polypeptide in vivo in order to induce such an immunological response to produce antibody to protect said animal from diseases of the invention
  • One wav of administering the vector is by
  • nucleic acid vector may comprise DNA, RNA, a modified nucleic acid, or a DNA/RNA hybrid
  • a polypeptide or a nucleic acid vector will be normally provided as a vaccine formulation (composition)
  • the formulation may further comprise a suitable carrier Since a polypeptide may be broken down in the stomach, it is preferably administered parenterally (for instance, subcutaneous, intramuscular, intravenous, or intradermal injection)
  • Formulations suitable for parenteral administration include aqueous and non-aqueous ste ⁇ le injection solutions that may contain anti-oxidants.
  • the formulations may be presented in unit-dose or multi-dose containers, for example, sealed ampoules and vials and may be stored in a freeze-d ⁇ ed condition requiring only the addition of the ste ⁇ le liquid earner immediately p ⁇ or to use
  • the vaccine formulation may also include adjuvant systems for enhancing the immunogenicity of the formulation, such as oil-in water systems and other systems known in the art The dosage will depend on the specific activity of the vaccine and can be readily determined by routine expe ⁇ mentation
  • Polypeptides of the present invention have one or more biological functions that are of relevance in one or more disease states, in particular the diseases of the invention which include neurological conditons, for example neuropathic pain, pain, chronic pain, postoperative pain, rheumatoid arth ⁇ tic pain, neuralgia, neuropathies, algesia, nerve injury, lschaemia, neurodegeneration, stroke, incontinence, inflammatory disorders, spasticity, myoclonus, epilepsy, head trauma, It is therefore useful to to identify compounds that stimulate or inhibit the function or level of the polypeptide Accordingly, in a further aspect, the present invention provides for a method of screening compounds to identify those that stimulate or inhibit the function or level of the polypeptide Such methods identify agonists or antagonists that may be employed for therapeutic and prophylactic purposes for such diseases of the invention as hereinbefore mentioned Compounds may be identified from a va ⁇ ety of sources, for example, cells, cell-free preparations, chemical branes collections of chemical compounds, and natural product mixture
  • the screening method may simply measure the binding of a candidate compound to the polypeptide, or to cells or membranes bea ⁇ ng the polypeptide, or a fusion protein thereof, by means of a label directly or indirectly associated with the candidate compound
  • the screening method may involve measuring or detecting (qualitatively or quantitatively) the competitive binding of a candidate compound to the polypeptide against a labeled competitor (e g agonist or antagonist)
  • these screening methods may test whether the candidate compound results in a signal generated bv activation or inhibition of the polypeptide, using detection systems approp ⁇ ate to the cells bearing the polypeptide Inhibitors of activation are generallv assayed in the presence of a known agonist and the effect on activation by the agonist by the presence of the candidate compound is observed
  • the screening methods may simply comprise the steps of mixing a candidate compound with a solution containing a polypeptide of the present invention, to form a mixture, measuring a RGS8LIKE activity in the mixture, and comparing the RGS8LIKE activity
  • Polypeptides of the present invention may be employed in conventional low capacity screening methods and also in high-throughput screening (HTS) formats
  • HTS formats include not only the well-established use of 96- and, more recently, 384-well micotiter plates but also emerging methods such as the nanowell method descnbed by Schullek et al, Anal Biochem , 246, 20-29, (1997)
  • Fusion proteins such as those made from Fc portion and RGS8LIKE polypeptide, as hereinbefore described, can also be used for high-throughput screening assays to identify antagonists for the polypeptide of the present invention (see D Bennett et al , J Mol Recognition, 8 52-58 ( 1995), and K Johanson et al , J Biol Chem, 270( 16) 9459-9471 (1995))
  • polypeptides and antibodies to the polypeptide of the present invention may also be used to configure screening methods for detecting the effect of added compounds on the production of mRNA and polypeptide in cells
  • an ELISA assay may be constructed for measuring secreted or cell associated levels of polypeptide using monoclonal and polyclonal antibodies by standard methods known in the art This can be used to discover agents that may inhibit or enhance the production of polypeptide (also called antagonist or agonist, respectively) from suitably manipulated cells or tissues
  • a polypeptide of the present invention may be used to identify membrane bound or soluble receptors, if any, through standard receptor binding techniques known in the art These include, but are not limited to, hgand binding and crosshnking assays in which the polypeptide is labeled with a radioactive isotope (for instance, ⁇ - > ⁇ ), chemically modified (for instance, biotinylated), or fused to a peptide sequence suitable for detection or punfication, and incubated with a source of the putative receptor (cells, cell membranes, cell supernatants, tissue extracts, bodily fluids) Other methods include biophysical techniques such as surface plasmon resonance and spectroscopy These screening methods may also be used to identify agonists and antagonists of the polypeptide that compete with the binding of the polypeptide to its receptors, if any Standard methods for conducting such assays are well understood in the art Examples of antagonists of polypeptides of the present invention include antibodies or, in some cases, o gonucleotides
  • substrates, receptors, enzymes, etc as the case may be, of the polypeptide, e.g , a fragment of the ligands, substrates, receptors, enzymes, etc , or a small molecule that bind to the polypeptide of the present invention but do not elicit a response, so that the activity of the polypeptide is prevented
  • transgenic technology may also involve the use of transgenic technology and RGS8LIKE gene
  • the RGS8LIKE gene may be introduced through microinjection into the male pronucleus of fertilized oocytes, retroviral transfer into pre- or post-implantation embryos, or injection of genetically modified, such as by electroporation, embryonic stem cells into host blastocysts
  • Particularly useful transgenic animals are so-called "knock-in” animals in which an animal gene is replaced by the human equivalent within the genome of that animal. Knock-in transgenic animals are useful in the drug discovery process, for target validation, where the compound is specific for the human target.
  • transgenic animals are so-called "knock-out' animals in which the expression of the animal ortholog of a polypeptide of the present invention and encoded by an endogenous DNA sequence in a cell is partially or completely annulled
  • the gene knock-out may be targeted to specific cells or tissues, may occur only in certain cells or tissues as a consequence of the limitations of the technology, or may occur in all, or substantially all, cells in the animal
  • Transgenic animal technology also offers a whole animal expression-cloning system in which introduced genes are expressed to give large amounts of polypeptides of the present invention
  • Screening kits for use in the above described methods form a further aspect of the present invention
  • Such screening kits comp ⁇ se
  • polypeptide of the present invention (d) an antibody to a polypeptide of the present invention, which polypeptide is preferably that of SEQ ID NO 2.
  • Antibodies as used herein includes polyclonal and monoclonal antibodies, chime ⁇ c, single chain, and humanized antibodies, as well as Fab fragments, including the products of an Fab or other immunoglobulin expression library
  • Isolated means altered “by the hand of man” from its natural state, : e , if it occurs in nature, it has been changed or removed from its original environment, or both
  • a polynucleotide or a polypeptide naturally present in a living organism is not “isolated,” but the same polynucleotide or polypeptide separated from the coexisting materials of its natural state is 'isolated", as the term is employed herein
  • a polynucleotide or polypeptide that is introduced into an organism by transformation, genetic manipulation or by any other recombinant method is "isolated” even if it is still present in said organism, which organism may be living or non-living
  • Polynucleotide generally refers to any polynbonucleotide (RNA) or polydeox ⁇ bonucleotide (DNA), which may be unmodified or modified RNA or DNA
  • Polynucleotides include, without limitation, single- and double-stranded DNA, DNA that is a mixture of single- and double-stranded regions, single- and double-stranded RNA, and RNA that is mixture of single- and double-stranded regions, hyb ⁇ d molecules comp ⁇ sing DNA and RNA that may be single-stranded or, more typically, double-stranded or a mixture of single- and double-stranded regions
  • polynucleotide refers to t ⁇ ple-stranded regions comprising RNA or DNA or both RNA and DNA
  • the term 'polynucleotide also includes DNAs or RNAs containing one or more modified bases and DNAs or RNAs with backbones modified for stability or for other reasons "Mod
  • Polypeptide refers to any polypeptide comp ⁇ sing two or more amino acids joined to each other by peptide bonds or modified peptide bonds, I e , peptide isosteres
  • Polypeptide refers to both short chains, commonly refened to as peptides, ohgopeptides or ohgomers, and to longer chains, generally refened to as proteins Polypeptides may contain amino acids other than the 20 gene-encoded amino acids
  • Polypeptides include amino acid sequences modified either by natural processes, such as post-translational processing, or by chemical modification techniques that are well known in the art Such modifications are well described in basic texts and in more detailed monographs, as well as in a voluminous research literature Modifications may occur anywhere in a polypeptide, including the peptide backbone, the amino acid side-chains and the amino or carboxyl termini It will be appreciated that the same type of modification may be present to the same or varying degrees at several sites in a given polypeptide Also, a
  • cross-linking cychzation, disulfide bond formation, demethylation, formation of covalent cross-links, formation of cystine, formation of pyroglutamate, formylation, gamma-carboxylation, glycosylation, GPI anchor formation hydroxylation. lodmation, methylauon, my ⁇ stoylation, oxidation, proteolytic processing, phosphor) lation.
  • Vanant ' refers to a polynucleotide or polypeptide that differs from a reference polynucleotide or polypeptide, but retains the essential properties thereof
  • a typical vanant of a polynucleotide differs in nucleotide sequence from the reference polynucleotide Changes in the nucleotide sequence of the vanant may or may not alter the amino acid sequence of a polypeptide encoded by the reference polynucleotide Nucleotide changes may result in am o acid substitutions, additions, deletions, fusions and truncations in the polypeptide encoded by the reference sequence, as discussed below
  • a typical vanant of a polypeptide differs in amino acid sequence from the reference polypeptide Generally, alterations are limited so that the sequences of the reference polypeptide and the vanant are closely similar overall and, in many regions, identical
  • a variant and reference polypeptide may differ in amino acid sequence by one or more substitutions, insertions, deletions in
  • Allele refers to one of two or more alternative forms of a gene occu ⁇ ng at a given locus in the genome
  • Polymo ⁇ hism refers to a variation in nucleotide sequence (and encoded polypeptide sequence, if relevant) at a given position in the genome within a population
  • SNP Single Nucleotide Polymo ⁇ hism '
  • ASA Specific Amplification
  • RNA Vanant refers to cDNA molecules produced from RNA molecules initially transcribed from the same genomic DNA sequence but which have undergone alternative RNA splicing
  • Alternative RNA splicing occurs when a primary RNA transcnpt undergoes splicing, generally for the removal of introns, which results in the production of more than one mRNA molecule each of that may encode different amino acid sequences
  • the term splice variant also refers to the proteins encoded by the above cDNA molecules.
  • Identity reflects a relationship between two or more polypeptide sequences or two or more polynucleotide sequences, determined by comparing the sequences. In general, identity refers to an exact nucleotide to nucleotide or amino acid to amino acid conespondence of the two polynucleotide or two polypeptide sequences, respectively, over the length of the sequences being compared
  • % Identity For sequences where there is not an exact conespondence, a "%> identity” may be determined.
  • the two sequences to be compared are aligned to give a maximum correlation between the sequences. This may include inserting "gaps" in either one or both sequences, to enhance the degree of alignment.
  • a 7 ⁇ identity may be determined over the whole length of each of the sequences being compared (so-called global alignment), that is particularly suitable for sequences of the same or very similar length, or over shorter, defined lengths (so- called local alignment), that is more suitable for sequences of unequal length
  • Similarity means a comparison between the amino acids of two polypeptide chains, on a residue by residue basis, taking into account not only exact conespondences between a between pairs of residues, one from each of the sequences being compared (as tor identity) but also, where there is not an exact correspondence, whether, on an evolutionary basis, one residue is a likely substitute for the other This likelihood has an associated "score" from which the "% similarity" of the two sequences can then be determined
  • BESTFIT finds the best single region of similarity between two sequences BESTFIT is more suited to comparing two polynucleotide or two polypeptide sequences that are dissimilar in length, the program assuming that the shorter sequence represents a portion of the longer In comparison, GAP aligns two sequences, finding a "maximum simila ⁇ ty", according to the algo ⁇ thm of Neddleman and Wunsch (J Mol Biol. 48, 443-453,
  • GAP is more suited to comparing sequences that are approximately the same length and an alignment is expected over the entire length.
  • the parameters "Gap Weight” and “Length Weight” used in each program are 50 and 3, for polynucleotide sequences and 12 and 4 for polypeptide sequences, respectively.
  • % identities and similarities are determined when the two sequences being compared are optimally aligned
  • the BLOSUM62 amino acid substitution matrix (Henikoff S and Henikoff J G, Proc. Nat. Acad Sci. USA, 89, 10915-10919, 1992) is used in polypeptide sequence comparisons including where nucleotide sequences are first translated into amino acid sequences before compa ⁇ son.
  • the program BESTFIT is used to determine the % identity of a query polynucleotide or a polypeptide sequence with respect to a reference polynucleotide or a polypeptide sequence, the query and the reference sequence being optimally aligned and the parameters of the program set at the default value, as hereinbefore descnbed
  • Identity Index is a measure of sequence relatedness which may be used to compare a candidate sequence (polynucleotide or polypeptide) and a reference sequence
  • a candidate polynucleotide sequence having, for example, an Identity Index of 0 95 compared to a reference polynucleotide sequence is identical to the reference sequence except that the candidate polynucleotide sequence may include on average up to five differences per each 100 nucleotides of the reference sequence Such differences are selected from the group consisting of at least one nucleotide deletion, substitution, including transition and transversion, or insertion These differences may occur at the 5 ' or 3' terminal positions of the reference polynucleotide sequence or anywhere between these terminal positions, interspersed either individually among the nucleotides in the reference sequence or in one or more contiguous groups within the reference sequence In other words, to obtain a polynucleotide sequence having an Identity Index of 0 95 compared to a reference polynucleotide sequence, an average
  • a candidate polypeptide sequence having, for example, an Identity Index of 0 95 compared to a reference polypeptide sequence is identical to the reference sequence except that the polypeptide sequence may include an average of up to five differences per each 100 ammo acids of the reference sequence Such differences are selected from the group consisting of at least one amino acid deletion, substitution, including conservative and non- conservative substitution, or insertion These differences may occur at the amino- or carboxy- terminal positions of the reference polypeptide sequence or anywhere between these terminal positions, interspersed either individually among the ammo acids in the reference sequence or in one or more contiguous groups within the reference sequence.
  • an average of up to 5 in every 100 of the ammo acids in the reference sequence may be deleted, substituted or inserted, or any combination thereof, as hereinbefore descnbed
  • n a is the number of nucleotide or amino acid differences
  • ⁇ a is the total number of nucleotides or am o acids in SEQ ID NO 1 or SEQ ID NO 2, respectively
  • I is the Identity Index
  • • is the symbol for the multiplication operator, and in which any non-integer product of x a and I is rounded down to the nearest integer prior to subtracting it from x a
  • “Homolog” is a generic term used in the art to indicate a polynucleotide or polypeptide sequence possessing a high degree of sequence relatedness to a reference sequence Such relatedness may be quantified by determining the degree of identity and/or similanty between the two sequences as hereinbefore defined Falling within this genenc term are the terms "ortholog", and “paralog” "Ortholog ' refers to a polynucleotide or polypeptide that is the functional equivalent of the polynucleotide or polypeptide in another species "Paralog” refers to a polynucleotideor polypeptide that within the same species which is functionally similar
  • Fusion protein refers to a protein encoded by two, often unrelated, fused genes or fragments thereof
  • EP-A-0 464 533-A discloses fusion proteins comprising va ⁇ ous portions of constant region of immunoglobulin molecules together with another human protein or part thereof
  • employing an immunoglobulin Fc region as a part of a fusion protein is advantageous for use in therapy and diagnosis resulting in, for example, improved pharmacokinetic properties [see, e g , EP-A 0232 262]
  • Brain* 20 tissues examined in the Syber-Green experiments were Brain*, pituitary, heart, lung, liver, foetal liver kidney, skeletal muscle, stomach, small/large intestine, spleen, lymphocytes (PBMC), macrophages, adipose, pancreas, prostate (4 males), placenta, cartilage, bone (l male, 3 females) and bone marrow
  • Brain an equal-part mix of the 18 most distinct brain regions representing 75% of sample and 25% of sample is spinal cord This approach was designed to maximise the chance of detecting genes expressed speftcally in small brain sub-regions
  • PBMC Lymphocytes

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Abstract

La présente invention concerne des polypeptides et des polynucléotides RGS8LIKE appartenant à la famille des polypeptides régulateurs de la signalisation par la protéine G et des procédés permettant de produire les polypeptides précités par des techniques de recombinaison. L'invention se rapporte également à des procédés d'utilisation des polypeptides et polynucléotides RGS8LIKE dans des méthodes diagnostiques.
EP00958883A 1999-09-14 2000-09-11 Polypeptides et polynucleotides rgs8like, appartenant a la famille des polypeptides regulateurs de la signalisation par la proteine g Withdrawn EP1131423A1 (fr)

Applications Claiming Priority (3)

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GBGB9921690.5A GB9921690D0 (en) 1999-09-14 1999-09-14 Novel compounds
GB9921690 1999-09-14
PCT/GB2000/003501 WO2001019984A1 (fr) 1999-09-14 2000-09-11 Polypeptides et polynucleotides rgs8like, appartenant a la famille des polypeptides regulateurs de la signalisation par la proteine g

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EP1131423A1 true EP1131423A1 (fr) 2001-09-12

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EP (1) EP1131423A1 (fr)
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Publication number Priority date Publication date Assignee Title
CA2408665A1 (fr) * 2000-05-12 2001-11-15 Merck Patent Gesellschaft Mit Beschraenkter Haftung Nouveau regulateur de signalisation proteine g
US7846671B2 (en) 2002-01-28 2010-12-07 Bristol-Myers Squibb Company Methods of screening for agents that modulate the interaction of RGS and Gαq and urinary incontinence

Non-Patent Citations (2)

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See also references of WO0119984A1 *

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