WO1999021984A1 - A human e25 homolog - Google Patents

Abstract

CBCCFG03 polypeptides and polynucleotides and methods for producing such polypeptides by recombinant techniques are disclosed. Also disclosed are methods for utilizing CBCCFG03 polypeptides and polynucleotides in the design of protocols for the treatment of diseases associated with osteogenesis, among others, and diagnostic assays for such conditions.

Description

A HUMAN E25 HOMOLOG

FIELD OF INVENTION

This invention relates to newly identified polynucleotides, polypeptides encoded by them and to the use of such polynucleotides and polypeptides, and to their production. More particularly, the polynucleotides and polypeptides ofthe present invention relate to the integral membrane proteins family, hereinafter referred to as CBCCFG03. The invention also relates to inhibiting or activating the action of such polynucleotides and polypeptides.

BACKGROUND OF THE INVENTION

Integral membrane proteins interact extensively with the hydrocarbon chains of membrane lipids. .In fact, nearly all known integral membrane proteins span the lipid bilayer. Integral membrane proteins are tightly bound to membranes by hydrophobic forces and can only be separated from them by treatment with agents that disrupt membranes. The murine E25 gene has been cloned from in vitro cultured condyles. It is expressed in the outer perichondrial rim ofthe postnatal mandibular condyle which contains proliferating progenitor cells and in osteogenic tissues, such as neonatal calvaria, paws, tail, and skin. This indicates that the integral membrane proteins family has an established, proven history as therapeutic targets. Clearly there is a need for identification and characterization of further members of the integral membrane proteins femily which can play a role in preventing, ameliorating or correcting dysfunctions or diseases, including, but not limited to, diseases associated with osteogenesis.

SUMMARY OF THE INVENTION

In one aspect, the invention relates to CBCCFG03 polypeptides and recombinant materials and methods for their production. .Another aspect ofthe invention relates to methods for using such CBCCFG03 polypeptides and polynucleotides. Such uses include the treatment of diseases associated with osteogenesis, among others. In still another aspect, the invention relates to methods to identify agonists and antagonists using the materials provided by the invention, and treating conditions associated with CBCCFG03 imbalance with the identified compounds. Yet another aspect ofthe invention relates to diagnostic assays for detecting diseases associated with inappropriate CBCCFG03 activity or levels.

DESCRIPTION OF THE INVENTION Definitions The following definitions are provided to facilitate understanding of certain terms used frequently herein.

"CBCCFG03" refers, among others, generally to a polypeptide having the amino acid sequence set forth in SEQ ID NO:2 or an allelic variant thereof. "CBCCFG03 activity or CBCCFG03 polypeptide activity" or "biological activity ofthe

CBCCFG03 or CBCCFG03 polypeptide" refers to the metabolic or physiologic function of said CBCCFG03 including similar activities or improved activities or these activities with decreased undesirable side-effects. Also included are antigenic and immunogenic activities of said CBCCFG03. "CBCCFG03 gene" refers to a polynucleotide having the nucleotide sequence set forth in

SEQ ID NOJ or allelic variants thereof and/or their complements.

"Antibodies" as used herein includes polyclonal and monoclonal antibodies, chimeric, 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 the natural state. If an "isolated" composition or substance occurs in nature, it has been changed or removed from its original environment, or both. For example, a polynucleotide or a polypeptide naturally present in a living animal is not "isolated," but the same polynucleotide or polypeptide separated from the coexisting materials of its natural state is "isolated", as the teim is employed herein. "Polynucleotide" generally refers to any polyribonucleotide or polydeoxribonucleotide, which may be unmodified RNA or DNA 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, hybrid molecules comprising DNA and RNA that may be single-stranded or, more typically, double-stranded or a mixture of single- and double-stranded regions. In addition, "polynucleotide" refers to triple-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. "Modified" bases include, for example, tritylated bases and unusual bases such as inosine. A variety of modifications has been made to DNA and .RNA; thus, "polynucleotide" embraces chemically, enzymatically or metabolically modified forms of polynucleotides as typically found in nature, as well as the chemical forms of DNA and RNA characteristic of viruses and cells. "Polynucleotide" also embraces relatively short polynucleotides, often referred to as oligonucleotides. "Polypeptide" refers to any peptide or protein comprising 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 referred to as peptides, oligopeptides or oligomers, and to longer chains, generally referred 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 posttranslational processing, or by chemical modification techniques which 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 can 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 in the same or varying degrees at several sites in a given polypeptide. Also, a given polypeptide may contain many types of modifications. Polypeptides may be branched as a result of ubiquitination, and they may be cyclic, with or without branching. Cyclic, branched and branched cyclic polypeptides may result from posttranslation natural processes or may be made by synthetic methods. Modifications include acetylation, acylation, .ADP-ribosylation, amidation, covalent attachment of flavin, covalent attachment of a heme moiety, covalent attachment of a nucleotide or nucleotide derivative, covalent attachment of a lipid or lipid derivative, covalent attachment of phosphotidylinositol, cross-linking, cyclization, disulfide bond formation, demethylation, formation of covalent cross-links, formation of cystine, formation of pyroglutamate, formylation, gamma- carboxylation, glycosylation, GPI anchor formation, hydroxylation, iodination, methylation, myristoylation, oxidation, proteolytic processing, phosphorylation, prenylation, racemization, selenoylation, sulfation, transfer-.RNA mediated addition of amino acids to proteins such as arginylation, and ubiquitination. See, for instance, PROTEINS - STRUCTURE AND MOLECULAR PROPERTIES, 2nd Ed., T. E. Creighton, W. H. Freeman and Company, New York, 1993 and Wold, F., Posttr.anslational Protein Modifications: Perspectives and Prospects, pgs. 1-12 in POSTTRANSLATIONAL COV.ALENT MODIFICATION OF PROTEINS, B. C. Johnson, Ed., Academic Press, New York, 1983; Seifter et al, "Analysis for protein modifications and nonprotein cofactors", Meth Enzymol (1990) 182:626-646 and Rattan et al. , "Protein Synthesis: Posttranslational Modifications and Aging", Ann NY AcadSci (1992) 663:48-62. "Variant" as the term is used herein, is a polynucleotide or polypeptide that differs from a reference polynucleotide or polypeptide respectively, but retains essential properties. A typical variant of a polynucleotide differs in nucleotide sequence from another, reference polynucleotide. Changes in the nucleotide sequence ofthe variant may or may not alter the amino acid sequence of a polypeptide encoded by the reference polynucleotide. Nucleotide changes may result in amino acid substitutions, additions, deletions, fusions and truncations in the polypeptide encoded by the reference sequence, as discussed below. A typical variant of a polypeptide differs in amino acid sequence from another, reference polypeptide. Generally, differences are limited so that the sequences ofthe reference polypeptide and the variant 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, additions, deletions in any combination. A substituted or inserted amino acid residue may or may not be one encoded by the genetic code. A variant of a polynucleotide or polypeptide may be a naturally occurring such as an allelic variant, or it may be a variant that is not .known to occur naturally. Non-naturally occurring variants of polynucleotides and polypeptides may be made by mutagenesis techniques or by direct synthesis.

"Identity" is a measure ofthe identity of nucleotide sequences or amino acid sequences. In general, the sequences are aligned so that the highest order match is obtained. "Identity" per se has an art-recognized meaning and can be calculated using published techniques. See, e.g.: (COMPUTATIONAL MOLECULAR BIOLOGY, Lesk, A.M., ed., Oxford University Press, New York, 1988; BIOCOMPUTING: INFORMATICS AND GENOME PROJECTS, Smith, D.W., ed., Academic Press, New York, 1993; COMPUTER ANALYSIS OF SEQUENCE DATA, PART I, Griffin, A.M., and Griffin, H.G., eds., Humana Press, New Jersey, 1994; SEQUENCE ANALYSIS IN MOLECULAR BIOLOGY, von Heinje, G., Academic Press, 1987; and SEQUENCE ANALYSIS PRIMER, Gribskov, M. and Devereux, J., eds., M Stockton Press, New York, 1991). While there exist a number of methods to measure identity between two polynucleotide or polypeptide sequences, the term "identity" is well known to skilled artisans (Carillo, H., and Lipton, D., SIAM J Applied Math (1988) 48:1073). Methods commonly employed to determine identity or similarity between two sequences include, but are not limited to, those disclosed in Guide to Huge Computers, Martin J. Bishop, ed., Academic Press, San Diego, 1994, and Carillo, H., and Lipton, D., SIAM J Applied Math (1988) 48: 1073. Methods to determine identity and similarity are codified in computer programs. Preferred computer program methods to deteπnine identity and similarity between two sequences include, but are not limited to, GCS program package (Devereux, J., et al, Nucleic Acids Research (1984) 12(1):387), BLASTP, BLASTN, FASTA (Atschul, S.F. et al., JMolec Biol (1990) 215:403). As an illustration, by a polynucleotide having a nucleotide sequence having at least, for example, 95% "identity" to a reference nucleotide sequence of SEQ ID NO: 1 is intended that the nucleotide sequence ofthe polynucleotide is identical to the reference sequence except that the polynucleotide sequence may include up to five point mutations per each 100 nucleotides ofthe reference nucleotide sequence of SEQ ID NO: 1. In other words, to obtain a polynucleotide having a nucleotide sequence at least 95% identical to a reference nucleotide sequence, up to 5% ofthe nucleotides in the reference sequence may be deleted or substituted with .another nucleotide, or a number of nucleotides up to 5% ofthe total nucleotides in the reference sequence may be inserted into the reference sequence. These mutations ofthe reference sequence may occur at the 5 or 3 terminal positions ofthe reference nucleotide sequence or anywhere between those teπninal positions, interspersed either individually among nucleotides in the reference sequence or in one or more contiguous groups within the reference sequence.

Similarly, by a polypeptide having an amino acid sequence having at least, for example, 95% "identity" to a reference amino acid sequence of SEQ ID NO:2 is intended that the amino acid sequence ofthe polypeptide is identical to the reference sequence except that the polypeptide sequence may include up to five amino acid alterations per each 100 amino acids ofthe reference amino acid of SEQ ID NO: 2. In other words, to obtain a polypeptide having an amino acid sequence at least 95% identical to a reference amino acid sequence, up to 5% ofthe amino acid residues in the reference sequence may be deleted or substituted with another amino acid, or a number of amino acids up to 5% ofthe total amino acid residues in the reference sequence may be inserted into the reference sequence. These alterations ofthe reference sequence may occur at the amino or carboxy terminal positions ofthe reference amino acid sequence or anywhere between those terminal positions, interspersed either individually among residues in the reference sequence or in one or more contiguous groups within the reference sequence.

Polypeptides ofthe Invention

In one aspect, the present invention relates to CBCCFG03 polypeptides (or CBCCFG03 proteins). The CBCCFG03 polypeptides include the polypeptide of SEQ ID NO:2; as well as polypeptides comprising the amino acid sequence of SEQ ID NO: 2; and polypeptides comprising the amino acid sequence which have at least 80% identity to that of SEQ ID NO:2 over its entire length, and still more preferably at least 90% identity, and even still more preferably at least 95% identity to SEQ ID NO: 2. Furthermore, those with at least 97-99% are highly prefeired. Also included within CBCCFG03 polypeptides are polypeptides having the amino acid sequence which have at least 80% identity to the polypeptide having the amino acid sequence of SEQ ID NO:2 over its entire length, and still more preferably at least 90% identity, and still more preferably at least 95% identity to SEQ ID NO:2. Furthermore, those with at least 97-99% are highly preferred. Preferably CBCCFG03 polypeptide exhibit at least one biological activity of CBCCFG03.

The CBCCFG03 polypeptides may be in the form ofthe "mature" protein or may be a part of a larger protein such as a fusion protein. It is often advantageous to include an additional amino acid sequence which contains secretory or leader sequences, pro-sequences, sequences which aid in purification such as multiple histidine residues, or an additional sequence for stability during recombinant production.

Fragments ofthe CBCCFG03 polypeptides are also included in the invention. A fragment is a polypeptide having an amino acid sequence that entirely is the same as part, but not all, ofthe amino acid sequence ofthe aforementioned CBCCFG03 polypeptides. As with CBCCFG03 polypeptides, fragments may be "free-standing," or comprised within a larger polypeptide of which they form a part or region, most preferably as a single continuous region. Representative examples of polypeptide fragments ofthe invention, include, for example, fragments from about amino acid number 1-20, 21-40, 41-60, 61- 80, 81-100, and 101 to the end of CBCCFG03 polypeptide. In this context "about" includes the particularly recited ranges larger or smaller by several, 5, 4, 3, 2 or 1 amino acid at either extreme or at both extremes.

Preferred fragments include, for example, truncation polypeptides having the amino acid sequence of CBCCFG03 polypeptides, except for deletion of a continuous series of residues that includes the amino terminus, or a continuous series of residues that includes the carboxyl terminus or deletion of two continuous series of residues, one including the amino terminus and one including the carboxyl terminus. Also preferred are

characterized by structural or functional attributes such as fragments that comprise alpha-helix and alplia-helix forming regions, beta-sheet and beta-sheet- forming regions, turn and turn-forming regions, coil and coil-foiming regions, hydrophilic regions, hydrophobic regions, alplia amphipathic regions, beta amphipathic regions, flexible regions, surface- forming regions, substrate binding region, and high antigenic index regions. Other preferred fragments are biologically active fragments. Biologically active fragments are those that mediate CBCCFG03 activity, including those with a similar activity or an improved activity, or with a decreased undesirable activity. Also included are those that are antigenic or immunogenic in an animal, especially in a human. Preferably, all of these polypeptide fragments retain the biological activity ofthe CBCCFG03, including antigenic activity. Variants ofthe defined sequence and fragments also form part ofthe present invention. Preferred variants are those that vary from the referents by conservative amino acid substitutions — i.e., those that substitute a residue with another of like characteristics. Typical such substitutions are among Ala, Val, Leu and He; among Ser and Thr; among the acidic residues Asp and Glu; among Asn and Gin; and among the basic residues Lys and Arg; or aromatic residues Phe and Tyr. Particularly preferred are variants in which several, 5-10, 1-5, or 1-2 amino acids are substituted, deleted, or added in any combination.

The CBCCFG03 polypeptides ofthe invention can be prepared in any suitable manner. Such polypeptides include isolated naturally occurring polypeptides, recombinantly produced polypeptides, synthetically produced polypeptides, or polypeptides produced by a combination of these methods. Means for preparing such polypeptides are well understood in the art.

Polynucleotides ofthe Invention .Another aspect ofthe invention relates to CBCCFG03 polynucleotides. CBCCFG03 polynucleotides include isolated polynucleotides which encode the CBCCFG03 polypeptides and fragments, and polynucleotides closely related thereto. More specifically, CBCCFG03 polynucleotide of the invention include a polynucleotide comprising the nucleotide sequence contained in SEQ ID NO: 1 encoding a CBCCFG03 polypeptide of SEQ ID NO: 2, and polynucleotide having the particular sequence of SEQ ID NO : 1. CBCCFG03 polynucleotides further include a polynucleotide comprising a nucleotide sequence that has at least 85 % identity over its entire length to a nucleotide sequence encoding the CBCCFG03 polypeptide of SEQ ID NO:2, and a polynucleotide comprising a nucleotide sequence that is at least 85% identical to of SEQ ID NO: 1 over its entire length. In this regard, polynucleotides at least 90% identical are particularly preferred, and those with at least 95% are especially preferred. Furthermore, those with at least 97% are highly preferred and those with at least 98-99% are most highly preferred, with at least 99% being the most preferred. Also included under CBCCFG03 polynucleotides are a nucleotide sequence which has sufficient identity to a nucleotide sequence contained in SEQ ID NOJ to hybridize under conditions useable for amplification or for use as a probe or marker. The invention also provides polynucleotides which are complementary to such CBCCFG03 polynucleotides.

CBCCFG03 ofthe invention is structurally related to other proteins ofthe integral membrane proteins family, as shown by the results of sequencing the cDNA of Table 1 (SEQ ID NO: 1) encoding human CBCCFG03. The cDNA sequence of SEQ ID NO: 1 contains an open reading frame (nucleotide number 140 to 928) encoding a polypeptide of 263 amino acids of SEQ ID NO:2. The amino acid sequence of Table 2 (SEQ ID NO:2) has about 94.7% identity (using FASTA) in 262 amino acid residues with mouse E25 (W. Deleersnijder et al.J. Biol. Chem. 271:19475-19482,1996). The nucleotide sequence of Table 1 (SEQ ID NOJ) has about 85% identity (using FASTA) in 1079 nucleotide residues with mouse E25 (W. Deleersnijder et al.J. Biol. Chem. 271:19475-19482,1996). Thus CBCCFG03 polypeptides and polynucleotides ofthe present invention are expected to have, inter aha, similar biological functions/properties to their homologous polypeptides and polynucleotides, and their utility is obvious to anyone skilled in the art.

Table l^a

GATCCCAGACCTCGGCTTGCAGTAGTGTTAGACTGAAGATAAAGT.AAGTGCTGTTTGGGCTAACAGGAT CTCCTCTTGCAGTCTGCAGCCCAGGACGCTGATTCCAGCAGCGCCTTACCGCGCAGCCCGAAGATTCAC TATGGTGAAAATCGCCTTCAATACCCCTACCGCCGTGCAAAAGGAGGAGGCGCGGCAAGACGTGGAGGC CCTCCTGAGCCGCACGGTCAGAACTCAGATACTGACCGGCAAGGAGCTCCGAGTTGCCACCCAGGAAAA AGAGGGCTCCTCTGGGAGATGTATGCTTACTCTCTTAGGCCTTTCATTCATCTTGGCAGGACTTATTGT TGGTGGAGCCTGCATTTACAAGTACTTCATGCCCAAGAGCACCATTTACCGTGGAGAGATGTGCTTTTT TGATTCTGAGGATCCTGCAAATTCCCTTCGTGGAGGAGAGCCTAACTTCCTGCCTGTGACTGAGGAGGC TGACATTCGTGAGGATGAC.AACATTGC.AATCATTGATGTGCCTGTCCCCAGTTTCTCTGATAGTGACCC TGCAGCAATTATTCATGACTTTGAAAAGGGAATGACTGCTTACCTGGACTTGTTGCTGGGGAACTGCTA TCTGATGCCCCTCAATACTTCTATTGTTATGCCTCCAA.AAAATCTGGTAGAGCTCTTTGGCAAACTGGC GAGTGGCAGATATCTGCCTCAAACTTATGTGGTTCGAGAAGACCTAGTTGCTGTGGAGG.AAATTCGTGA TGTTAGTAACCTTGGCATCTTTATTTACCAACTTTGCAATAACAGAAAGTCCTTCCGCCTTCGTCGCAG AGACCTCTTGCTGGGTTTCAACAAACGTGCCATTGATAAATGCTGGAAGATTAGACACTTCCCCAACGA ATTTATTGTTGAGACCAAGATCTGTCAAGAGTAAGAGGCAACAGATAGAGTGTCCTTGGTAATAAGAAG TCAGAGATTTACAATATGACTTTAACATTAAGGTTTATGGGATACTCAAGATATTTACTCATGCATTTA CTCTATTGCTTATGCCGTAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

A nucleotide sequence of a human CBCCFG03 (SEQ ID NO: 1).

Table t

MVT IAFNTPTAVQKEEARQDVEALLSRT TQILTGKELRVATQEKEGSSGRCMLTL GL SFILAGLIVGGACIYKYFMPKSTIYRGEMCFFDSEDPANSLRGGEPNFLPVTEEADIRED DNIAIIDVPVPSFSDSDPaflAIIHDFEKGMTAY DLL GNCY iyiPLNTSIVMPPKNLVE F GKLASGRYLPQTYWREDLVAVEEIRDVSNLGIFIYQLC RKSFR RRRDLLLGFNKRA IDKCWKIRHFPNEFIVETKICQE*

An amino acid sequence of a human CBCCFG03 (SEQ ID NO: 2).

One polynucleotide ofthe present invention encoding CBCCFG03 may be obtained using standard cloning and screening, from a cDNA library derived from mRNA in cells of human cord blood using the expressed sequence tag (EST) analysis (Adams, M.D., et al. Science (1991) 252:1651- 1656; Adams, M.D. et al., Nature, (1992) 555:632-634; Adams, M.D., et al., Nature (1995) 377 Supp:3-174). Polynucleotides ofthe invention can also be obtained from natural sources such as genomic DNA libraries or can be synthesized using well known and commercially available techniques. The nucleotide sequence encoding CBCCFG03 polypeptide of SEQ ID NO: 2 may be identical to the polypeptide encoding sequence contained in Table 1 (nucleotide number 140 to 928 of SEQ ID NO: 1), or it may be a sequence, which as a result ofthe redundancy (degeneracy) ofthe genetic code, also encodes the polypeptide of SEQ ID NO:2. When the polynucleotides ofthe invention are used for the recombinant production of CBCCFG03 polypeptide, the polynucleotide may include the coding sequence for the mature polypeptide or a fragment thereof, by itself; the coding sequence for the mature polypeptide or fragment 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. For example, a marker sequence which facilitates purification ofthe fused polypeptide can be encoded. In ceitain preferred embodiments of this aspect ofthe invention, the marker sequence is a hexa-histidine peptide, as provided in the pQE vector (Qiagen, Inc.) and described in Gentz etal., Proc Natl AcadSci USA (1989) 86:821- 824, or is an HA tag. The polynucleotide may also contain non-coding 5' and 3' sequences, such as transcribed, non-translated sequences, splicing and polyadenylation signals, ribosome binding sites and sequences that stabilize mRNA.

Further preferred embodiments are polynucleotides encoding CBCCFG03 variants comprise the amino acid sequence CBCCFG03 polypeptide of Table 2 (SEQ ID NO:2) in which several, 5-10, 1-5, 1-3, 1-2 or 1 amino acid residues are substituted, deleted or added, in any combination. The present invention further relates to polynucleotides that hybridize to the herein above- described sequences. In this regard, the present invention especially relates to polynucleotides which hybridize under stringent conditions to the herein above-described polynucleotides. As herein used, the term "stringent conditions" means hybridization will occur only if there is at least 80%, and preferably at least 90%, and more preferably at least 95%, yet even more preferably 97-99% identity between the sequences.

Polynucleotides ofthe invention, which are identical or sufficiently identical to a nucleotide sequence contained in SEQ ID NO: 1 or a fragment thereof, may be used as hybridization probes for cDNA and genomic DNA to isolate full-length cDNAs and genomic clones encoding CBCCFG03 polypeptide and to isolate cDNA and genomic clones of other genes (including genes encoding homologs and oiihologs from species other than human) that have a high sequence similarity to the CBCCFG03 gene. Such hybridization techniques are known to those of skill in the art. Typically these nucleotide sequences are 80% identical, preferably 90% identical, more preferably 95% identical to that ofthe referent. The probes generally will comprise at least 15 nucleotides. Preferably, such probes will have at least 30 nucleotides and may have at least 50 nucleotides. Particularly preferred probes will range between 30 and 50 nucleotides.

In one embodiment, to obtain a polynucleotide encoding CBCCFG03 polypeptide, including homologs and orthologs from species other than human, comprises the steps of screening an appropriate library under stingent hybridization conditions with a labeled probe having the SEQ ID NO: 1 or a fragment thereof; and isolating full-lengt cDNA and genomic clones containing said polynucleotide sequence. Thus in another aspect, CBCCFG03 polynucleotides ofthe present invention further include a nucleotide sequence comprising a nucleotide sequence that hybridize under stringent condition to a nucleotide sequence having SEQ ID NO: 1 or a fragment thereof . Also included with CBCCFG03 polypeptides are polypeptide comprising amino acid sequence encoded by nucleotide sequence obtained by the above hybridization condition. Such hybridization techniques are well .known to those of skill in the art. Stringent hybridization conditions are as defined above or, alternatively, conditions under overnight incubation at 42°C in a solution comprising: 50% formamide, 5xSSC (150mM NaCl, 15mM trisodium citrate), 50 mM sodium phosphate (pH7.6), 5x Denhardt's solution, 10 % dextran sulfete, and 20 microgram/ml denatured, sheared salmon sperm DNA, followed by wasliing the filters in 0. lx SSC at about 65°C.

The polynucleotides and polypeptides ofthe present invention may be employed as research reagents and materials for discovery of treatments and diagnostics to animal and human disease.

Vectors, Host Cells, Expression The present invention also relates to vectors which comprise a polynucleotide or polynucleotides ofthe present invention, and host cells which are genetically engineered with vectors ofthe invention and to the production of polypeptides ofthe invention by recombinant techniques. Cell-free translation systems can also be employed to produce such proteins using RNAs derived from the DNA constructs of the present invention. For recombinant production, host cells can be genetically engineered to incorporate expression systems or portions thereof for polynucleotides ofthe present invention. Introduction of polynucleotides into host cells can be effected by methods described in many standard laboratory manuals, such as Davis et al, BASIC METHODS IN MOLECULAR BIOLOGY (1986) and Sambrook et al, OLEC(J R CLONING: A LABORATORY MANUAL, 2nd Ed., Cold Spring .Harbor Laboratory Press, Cold Spring Harbor, N.Y. (1989) such as calcium phosphate transfection, DE.AE-dextran mediated transfection, transvection, microinjection, cationic lipid-mediated transfection, electroporation, transduction, scrape loading, ballistic introduction or infection.

Representative examples of appropriate hosts include bacterial cells, such as streptococci, staphylococci, E. coll, Streptomyces and Bacillus subtilis cells; fungal cells, such as yeast cells and Aspergillus cells; insect cells such as Drosophila S2 and Spodoptera Sf9 cells; animal cells such as CHO, COS, HeLa, C127, 3T3, BHK, HEK 293 and Bowes melanoma cells; and plant cells.

A great variety of expression systems can be used. Such systems .include, among others, chromosomal, episomal and virus-derived systems, e.g., vectors derived from bacterial plasmids, from bacteriopliage, from transposons, from yeast episomes, from insertion elements, from yeast cliromosomal elements, from viruses such as baculoviruses, papova vinises, such as SV40, vaccinia viruses, adenoviruses, fowl pox viruses, pseudorabies viruses and retroviruses, and vectors derived from combinations thereof, such as those derived from plasmid and bacteriophage genetic elements, such as cosmids and phagemids. The expression systems may contain control regions that regulate as well as engender expression. Generally, any system or vector suitable to maintain, propagate or express polynucleotides to produce a polypeptide in a host may be used. The appropriate nucleotide sequence may be inserted into an expression system by any of a variety of well-known and routine techniques, such as, for example, those set forth in Sambrook et al., MOLECULAR CLONING, A LABORATORY MANUAL (supra). For secretion ofthe translated protein into the lumen ofthe endoplasmic reticulum, into the periplasmic space or into the extracellular environment, appropriate secretion signals may be incorporated into the desired polypeptide. These signals may be endogenous to the polypeptide or they may be heterologous signals.

If the CBCCFG03 polypeptide is to be expressed for use in screening assays, generally, it is preferred that the polypeptide be produced at the surface ofthe cell. In this event, the cells may be harveΛed prior to use in the screening assay. If CBCCFG03 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. CBCCFG03 polypeptides can be recovered and purified from recombinant cell cultures by well-l iown methods including ammonium sulfete or ethanol precipitation, acid extraction, anion or cation exchange chromatography, phosphocellulose chromatography, hydrophobic interaction chromatography, affinity chromatography, hydroxylapatite chromatography and lectin chromatography. Most preferably, high performance liquid chromatography is employed for purification. Well known techniques for refolding proteins may be employed to regenerate active conformation when the polypeptide is denatured during isolation and or purification.

Diagnostic Assays

This invention also relates to the use of CBCCFG03 polynucleotides for use as diagnostic reagents. Detection of a mutated form of CBCCFG03 gene 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 expression of CBCCFG03. Individuals carrying mutations in the CBCCFG03 gene may be detected at the DNA level by a variety of techniques.

Nucleic acids for diagnosis may be obtained from a subject's cells, such as from blood, urine, saliva, tissue biopsy or autopsy material. The genomic DNA may be used directly for detection or may be amplified enzymatically by using PCR or other amplification techniques prior to analysis. RNA or cDNA may also be used in similar fashion. Deletions and insertions can be detected by a change in size ofthe amplified product in comparison to the normal genotype. Point mutations can be identified by hybridizing amplified DNA to labeled CBCCFG03 nucleotide sequences. Perfectly matched sequences can be distinguished from mismatched duplexes by RNase digestion or by differences in melting temperatures. DNA sequence differences may also be detected by alterations in electrophoretic mobility of DNA fragments in gels, with or without denaturing agents, or by direct DNA sequencing. See, e.g., Myers et al. , Science (1985) 230: 1242. Sequence changes at specific locations may also be revealed by nuclease protection assays, such as RNase and SI protection or the chemical cleavage method. See Cotton etal., ProcNatlAcad Set USA (1985) 85: 4397-4401. In another embodiment, an array of oligonucleotides probes comprising CBCCFG03 nucleotide sequence or fragments thereof can be constructed to conduct efficient screening of e.g., genetic mutations.

methods are well known and have general applicability and can be used to address a variety of questions in molecular genetics including gene expression, genetic linkage, and genetic variability. (See for example: M.Chee et al., Science, Vol 274, pp 610-613 (1996)).

The dia^*no,stic assays offer a process for diagnosing or determining a susceptibility to diseases associated with osteogenesis through detection of mutation in the CBCCFG03 gene by the methods described. m addition, diseases associated with osteogenesis, can be diagnosed by methods comprising determining from a sample derived from a subject an abnormally decreased or increased level of CBCCFG03 polypeptide or CBCCFG03 mRNA. Decreased or increased expression can be measured at the RNA level using any ofthe methods well known in the art for the quantitation of polynucleotides, such as, for example, PCR, RT-PCR, RNase protection, Northern blotting and other hybridization methods. Assay techniques that can be used to determine levels of a protein, such as an CBCCFG03 polypeptide, in a sample derived from a host are well-known to those of skill in the art. Such assay methods include radioimmunoassays, competitive-binding assays, Western Blot analysis and ELISA assays.

Thus in another aspect, the present invention relates to a diagonostic kit for a disease or suspectability to a disease, particularly diseases associated with osteogenesis, which comprises: (a) a CBCCFG03 polynucleotide, preferably the nucleotide sequence of SEQ ID NO: 1, or a fragment thereof ;

(b) a nucleotide sequence complementary to that of (a);

(c) a CBCCFG03 polypeptide, preferably the polypeptide of SEQ ID NO: 2, or a fragment thereof; or (d) an antibody to a CBCCFG03 polypeptide, preferably to the polypeptide of SEQ ID NO: 2. It will be appreciated that in any such kit, (a), (b), (c) or (d) may comprise a substantial component.

Chromosome Assays

The nucleotide sequences ofthe present invention are also valuable for chromosome identification. The sequence is specifically targeted to and can hybridi∞ 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. Once a sequence has been mapped to a precise chromosomal location, the physical position ofthe sequence on the chromosome can be correlated with genetic map data. Such data are found, for example, in V. McKusick, Mendelian Inheritance 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 (coinheritance of physically adjacent genes).

The differences in the cDNA or genomic sequence between affected and unaffected individuals can also be determined. If a mutation is observed in some or all ofthe affected individuals but not in any normal individuals, then the mutation is likely to be the causative agent ofthe disease.

Antibodies

The polypeptides ofthe invention or their fragments or analogs thereof, or cells expressing them can also be used as immunogens to produce antibodies immunospecific for the CBCCFG03 polypeptides. The term "immunospecific" means that the antibodies have substantiall greater affinity for the polypeptides ofthe invention than their affinity for other related polypeptides in the prior art.

.antibodies generated against the CBCCFG03 polypeptides can be obtained by administeririg the polypeptides or epitope-bearing fragments, analogs or cells to an animal, preferably a nonhuman, 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 hybridoma technique (Kohler, G. and Milstein, C, Nαtwre (1975) 256:495-497), the trioma technique, the human B-cell hybridoma technique (Kozbor etal, Immunology Today (1983) 4:72) and the EBV-hybridoma technique (Cole et al. , MONOCLONAL ANTIBODIES AND CANCER THERAPY, pp. 77-96, Alan R. Liss, Inc., 1985). Techniques for the production of single chain antibodies (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.

The above-described antibodies may be employed to isolate or to identify clones expressing the polypeptide or to purify the polypeptides by affinity chromatography.

Antibodies against CBCCFG03 polypeptides may also be employed to treat diseases associated with osteogenesis, among others.

Vaccines Another aspect ofthe invention relates to a method for inducing an immunological response in a mammal which comprises inoculating the mammal with CBCCFG03 polypeptide, or a fragment thereof, adequate to produce antibody and/or T cell immune response to protect said animal from diseases associated with osteogenesis, among others. Yet another aspect ofthe invention relates to a method of inducing immunological response in a mammal which comprises, delivering CBCCFG03 polypeptide via a vector directing expression of CBCCFG03 polynucleotide in vivo in order to induce such an immunological response to produce antibody to protect said animal from diseases.

Further aspect ofthe invention relates to an immunological/vaccine formulation (composition) which, when introduced into a mammalian host, induces an immunological response in that mammal to a CBCCFG03 polypeptide wherein the composition comprises a CBCCFG03 polypeptide or CBCCFG03 gene. The vaccine formulation may further comprise a suitable carrier. Since CBCCFG03 polypeptide may be broken down in the stomach, it is preferably administered parenterally (including subcutaneous, intramuscular, intravenous, intradermal etc. injection). Foπnulations suitable for parenteral administration include aqueous and non-aqueous sterile injection solutions which may contain anti-oxidants, buffers, bacteriostats and solutes which render the formulation instonic with the blood ofthe recipient; and aqueous and non-aqueous sterile suspensions which may include suspending agents or thickening agents. The foπnulations may be presented in unit-dose or multi-dose containers, for example, sealed ampoules and vials and may be stored in a freeze-dried condition requiring only the addition ofthe sterile liquid carrier immediately prior to use. The vaccine formulation may also include adjuvant systems for enhancing the immunogenicity ofthe formulation, such as oil-in water systems and other systems known in the art. The dosage will depend on the specific activity ofthe vaccine and can be readily determined by routine experimentation. Screening Assays

The CBCCFG03 polypeptide ofthe present invention may be employed in a screening process for compounds which activate (agonists) or inhibit activation of (antagoni.sts, or otherwise called inhibitors) the CBCCFG03 polypeptide ofthe present invention. Thus, polypeptides ofthe invention may also be used to assess identify agonic or antagonists from, for example, cells, cell-free preparations, chemical libraries, and natural product mixtures. These agonists or antagonists may be natural or modified substrates, ligands, receptors, enzymes, etc., as the case may be, ofthe polypeptide ofthe present invention; or may be structural or functional mimetics ofthe polypeptide ofthe present invention. See Coligan etal, Current Protocols in Immunology l(2):Chapter 5 (1991). CBCCFG03 polypeptides are responsible for many biological functions, including many pathologies.

Accordingly, it is desirous to find compounds and drugs which stimulate CBCCFG03 polypeptide on the one hand and which can inhibit the function of CBCCFG03 polypeptide on the other hand. In general, agonists are employed for therapeutic and prophylactic purposes for such conditions as diseases associated with osteogenesis. .Antagonists may be employed for a variety of therapeutic and prophylactic purposes for such conditions as diseases associated with osteogenesis.

In general, such screening procedures may involve using appropriate cells which express the CBCCFG03 polypeptide or respond to CBCCFG03 polypeptide ofthe present invention. Such cells include cells from mammals, yeast, Drosophila or E. coli. Cells which express the CBCCFG03 polypeptide (or cell membrane containing the expressed polypeptide) or respond to CBCCFG03 polypeptide are then contacted with a test compound to observe binding, or stimulation or inhibition of a functional response. The ability ofthe cells which were contacted with the candidate compounds is compared with the same cells which were not contacted for CBCCFG03 activity.

The assays may simply test binding of a candidate compound wherein adherence to the cells bearing the CBCCFG03 polypeptide is detected by means of a label directly or indirectly associated with the candidate compound or in an assay involving competition with a labeled competitor. Further, these assays may test whether the candidate compound results in a signal generated by activation ofthe CBCCFG03 polypeptide, using detection systems appropriate to the cells bearing the CBCCFG03 polypeptide. Inhibitors of activation are generally assayed in the presence of a known agonist and the effect on activation by the agonist by the presence ofthe candidate compound is observed.

Further, the assays may simply comprise the steps of mixing a candidate compound with a solution containing a CBCCFG03 polypeptide to form a mixture, measuring CBCCFG03 activity in the mixture, and comparing the CBCCFG03 activity ofthe mixture to a standard. The CBCCFG03 cDNA, protein and antibodies to the protein may also be used to configure assays for detecting the effect of added compounds on the production of CBCCFG03 mRNA and protein in cells. For example, an ELISA may be constructed for measuring secreted or cell associated levels of CBCCFG03 protein using monoclonal and polyclonal antibodies by standard methods known in the art, and this can be used to discover agents which may inhibit or enhance the production of CBCCFG03 (also called antagonist or agonist, respectively) from suitably manipulated cells or tissues.

The CBCCFG03 protein 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, ligand binding and crosslinking assays in which the CBCCFG03 is labeled with a radioactive isotope (eg 1251), chemically modified (eg biotinylated), or fused to a peptide sequence suitable for detection or purification, and incubated with a source ofthe putative receptor (cells, cell membranes, cell supernatants, tissue extracts, bodily fluids). Other methods include biophysical techniques such as surface plasmon resonance and spectroscopy. In addition to being used for purification and cloning ofthe receptor, these binding assays can be used to identify agonists and antagonists of CBCCFG03 which compete with the binding of CBCCFG03 to its receptors, if any. Standard methods for conducting screening assays are well understood in the art. Examples of potential CBCCFG03 polypeptide antagonists include antibodies or, in some cases, oligonucleotides or proteins which are closely related to the ligands, substrates, receptors, enzymes, etc., as the case may be, ofthe CBCCFG03 polypeptide, e.g., a fragment ofthe hgands, substrates, receptors, enzymes, etc.; or small molecules which bind to the polypetide ofthe present invention but do not elicit a response, so that the activity ofthe polypeptide is prevented.

Thus in another aspect, the present invention relates to a screening kit for identifying agonists, antagonists, ligands, receptors, substrates, enzymes, etc. for CBCCFG03 polypeptides; or compounds which decrease or enhance the production of CBCCFG03 polypeptides, which comprises:

(a) a CBCCFG03 polypeptide, preferably that of SEQ ID NO:2;

(b) a recombinant cell expressing a CBCCFG03 polypeptide, preferably that of SEQ ID NO:2;

(c) a cell membrane expressing a CBCCFG03 polypeptide; preferably that of SEQ ID NO: 2; or (d) antibody to a CBCCFG03 polypeptide, preferably that of SEQ ID NO : 2.

It will be appreciated that in any such kit, (a), (b), (c) or (d) may comprise a substantial component.

Prophylactic and Therapeutic Methods This invention provides methods of treating abnormal conditions such as, diseases associated with osteogenesis, related to both an excess of and insufficient amounts of CBCCFG03 polypeptide activity.

If the activity of CBCCFG03 polypeptide is in excess, several approaches are available. One approach comprises administering to a subject an inhibitor compound (antagonist) as hereinabove described along with a pliaπnaceutically acceptable carrier in an amount effective to inhibit the function ofthe CBCCFG03 polypeptide, such as, for example, by blocking the binding of ligands, substrates, receptors, enzymes, etc., or by inhibiting a second signal, and thereby alleviating the abnormal condition. In another approach, soluble forms of CBCCFG03 polypeptides still capable of binding the ligand, substrate, enzymes, receptors, etc. in competition with endogenous CBCCFG03 polypeptide may be administered. Typical embodiments of such competitors comprise fragments ofthe CBCCFG03 polypeptide.

In still another approach, expression ofthe gene encoding endogenous CBCCFG03 polypeptide can be inhibited using expression blocking techniques. Known such techniques involve the use of antisense sequences, either internally generated or separately administered. See, for example, O'Connor, J Neurochem (1991) 56:560 in Oligodeoxynucleotides as Antisense Inhibitors of Gene Expression. CRC Press, Boca Raton, FL (1988). Alternatively, oligonucleotides which form triple helices with the gene can be supplied. See, for example, Lee et al., Nucleic Acids Res (1979) 6:3073; Cooney et al, Science (1988) 241:456; Dervan et al, Science (1991) 251:1360. These oligomers can be administered per se or the relevant oligomers can be expressed in vivo.

For treating abnormal conditions related to an under-expression of CBCCFG03 and its activity, several approaches are also available. One approach comprises administering to a subject a therapeutically effective amount of a compound which activates CBCCFG03 polypeptide, i.e., an agonist as described above, in combination with a pharmaceutically acceptable carrier, to thereby alleviate the abnormal condition. Alternatively, gene therapy may be employed to effect the endogenous production of CBCCFG03 by the relevant cells in the subject. For example, a polynucleotide ofthe invention may be engineered for expression in a replication defective retroviral vector, as discussed above. The retroviral expression construct may then be isolated and introduced into a packaging cell transduced with a retroviral plasmid vector containing RNA encoding a polypeptide ofthe present invention such that the packaging cell now produces infectious viral particles containing the gene of interest. These producer cells may be administered to a subject for engineering cells in vivo and expression ofthe polypeptide in vivo. For overview of gene therapy, see Chapter 20, Gene Therapy and other Molecular Genetic-based Therapeutic Approaches, (and references cited therein) in Human Molecular Genetics, T Strachan and A P Read, BIOS Scientific Publishers Ltd (1996). Another approach is to administer a therapeutic amount of CBCCFG03 polypeptides in combination with a suitable pharmaceutical carrier.

Formulation and Administration Peptides, such as the soluble form of CBCCFG03 polypeptides, and agonists and antagonist peptides or small molecules, may be formulated in combination with a suitable pharmaceutical carrier. Such formulations comprise a therapeutically effective amount ofthe polypeptide or compound, and a pharmaceutically acceptable carrier or excipient. Such carriers include but are not limited to, saline, buffered saline, dextrose, water, glycerol, ethanol, and combinations thereof. Formulation should suit the mode of administration, and is well within the skill ofthe art. The invention further relates to pharmaceutical packs and kits comprising one or more containers filled with one or more ofthe ingredients ofthe aforementioned compositions ofthe invention.

Polypeptides and other compounds ofthe present invention may be employed alone or in conjunction with other compounds, such as therapeutic compounds. Preferred forms of systemic administration ofthe pharmaceutical compositions include injection, typically by intravenous injection. Other injection routes, such as subcutaneous, intramuscular, or intraperitoneal, can be used. Alternative means for systemic administration include transmucosal and transdermal administration using penetrants such as bile salts or fusidic acids or other detergents. In addition, if properly formulated in enteric or encapsulated formulations, oral administration may also be possible. Administration of these compounds may also be topical and/or localized, in the form of salves, pastes, gels and the like.

The dosage range required depends on the choice of peptide, the route of administration, the nature ofthe formulation, the nature ofthe subject's condition, and the judgment ofthe attending practitioner. Suitable dosages, however, are in the range of 0.1-100 μg/kg of subject. Wide variations in the needed dosage, however, are to be expected in view ofthe variety of compounds available and the differing efficiencies of various routes of administration. For example, oral administration would be expected to require higher dosages than administration by intravenous injection. Variations in these dosage levels can be adjusted using standard empirical routines for optimi.zation, as is well understood in the art. Polypeptides used in treatment can also be generated endogenously in the subject, in treatment modahties often referred to as "gene therapy" as described above. Thus, for example, cells from a subject may be engineered with a polynucleotide, such as a DNA or RNA, to encode a polypeptide ex vivo, and for example, by the use of a retroviral plasmid vector. The cells are then introduced into the subject All publications, including but not limited to patents and patent applications, cited in this specification are herein incorporated by reference as if each individual publication were specifically and individually indicated to be incorporated by reference herein as though fully set forth.

SEQUENCE LISTING

(1) GENERAL INFORMATION

(i) APPLICANT: FU, GANG MAO, MAO WANG, YA-XIN

(ii) TITLE OF THE INVENTION: A HUMAN E25 HOMOLOG

(iii) NUMBER OF SEQUENCES: 2

(iv) CORRESPONDENCE ADDRESS:

(A) ADDRESSEE: RATNER & PRESTIA

(B) STREET: P.O. BOX 980

(C) CITY: VALLEY FORGE (D) STATE: PA

(E) COUNTRY: USA

(F) ZIP: 19482

(v) COMPUTER READABLE FORM: (A) MEDIUM TYPE: Diskette

(B) COMPUTER: IBM Compatible

(C) OPERATING SYSTEM: DOS

(D) SOFTWARE: FastSEQ for Windows Version 2.0

(vi) CURRENT APPLICATION DATA:

(A) APPLICATION NUMBER: TO BE ASSIGNED

(B) FILING DATE:

(C) CLASSIFICATION: UNKNOWN

(vii) PRIOR APPLICATION DATA:

(A) APPLICATION NUMBER:

(B) FILING DATE:

(viii) ATTORNEY/AGENT INFORMATION:

(A) NAME: PRESTIA, PAUL F

(B) REGISTRATION NUMBER: 23,031 ( C ) REFERENCE/ DOCKET NUMBER : GP-70307

( ix ) TELECOMMUNICATION INFORMATION :

(A) TELEPHONE : 610-407- 0700

( B ) TELEFAX : 610-407 - 0701

( C ) TELEX : 846169

( 2 ) INFORMATION FOR SEQ ID NO : l :

(i) SEQUENCE CHARACTERISTICS:

(A) LENGTH: 1082 base pairs

(B) TYPE: nucleic acid

(C) STRANDEDNESS: single (D) TOPOLOGY: linear

(ii) MOLECULE TYPE: cDNA

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:l:

GATCCCAGAC CTCGGCTTGC AGTAGTGTTA GACTGAAGAT AAAGTAAGTG CTGTTTGGGC 60

TAACAGGATC TCCTCTTGCA GTCTGCAGCC CAGGACGCTG ATTCCAGCAG CGCCTTACCG 120

CGCAGCCCGA AGATTCACTA TGGTGAAAAT CGCCTTCAAT ACCCCTACCG CCGTGCAAAA 180

GGAGGAGGCG CGGCAAGACG TGGAGGCCCT CCTGAGCCGC ACGGTCAGAA CTCAGATACT 240

GACCGGCAAG GAGCTCCGAG TTGCCACCCA GGAAAAAGAG GGCTCCTCTG GGAGATGTAT 300 GCTTACTCTC TTAGGCCTTT CATTCATCTT GGCAGGACTT ATTGTTGGTG GAGCCTGCAT 360

TTACAAGTAC TTCATGCCCA AGAGCACCAT TTACCGTGGA GAGATGTGCT TTTTTGATTC 420

TGAGGATCCT GCAAATTCCC TTCGTGGAGG AGAGCCTAAC TTCCTGCCTG TGACTGAGGA 480

GGCTGACATT CGTGAGGATG ACAACATTGC AATCATTGAT GTGCCTGTCC CCAGTTTCTC 540

TGATAGTGAC CCTGCAGCAA TTATTCATGA CTTTGAAAAG GGAATGACTG CTTACCTGGA 600 CTTGTTGCTG GGGAACTGCT ATCTGATGCC CCTCAATACT TCTATTGTTA TGCCTCCAAA 660

AAATCTGGTA GAGCTCTTTG GCAAACTGGC GAGTGGCAGA TATCTGCCTC AAACTTATGT 720

GGTTCGAGAA GACCTAGTTG CTGTGGAGGA AATTCGTGAT GTTAGTAACC TTGGCATCTT 780

TATTTACCAA CTTTGCAATA ACAGAAAGTC CTTCCGCCTT CGTCGCAGAG ACCTCTTGCT 840

GGGTTTCAAC AAACGTGCCA TTGATAAATG CTGGAAGATT AGACACTTCC CCAACGAATT 900 TATTGTTGAG ACCAAGATCT GTCAAGAGTA AGAGGCAACA GATAGAGTGT CCTTGGTAAT 960

AAGAAGTCAG AGATTTACAA TATGACTTTA ACATTAAGGT TTATGGGATA CTCAAGATAT 1020

TTACTCATGC ATTTACTCTA TTGCTTATGC CGT.AAAAAAA AAAAAAAAAA AAAAAAAAAA 1080

AA 1082

(2) INFO.RMATION FOR SEQ ID NO: 2:

(i) SEQUENCE CHARACTERISTICS: (A) LENGTH: 263 amino acids (B) TYPE: amino acid

(C) STRANDEDNESS: single

(D) TOPOLOGY: linear

(ii) MOLECULE TYPE: protein

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:2:

Met Val Lys lie Ala Phe Asn Thr Pro Thr Ala Val Gin Lys Glu Glu 1 5 10 15 Ala Arg Gin Asp Val Glu Ala Leu Leu Ser Arg Thr Val Arg Thr Gin 20 25 30 lie Leu Thr Gly Lys Glu Leu Arg Val .Ala Thr Gin Glu Lys Glu Gly

35 40 45

Ser Ser Gly Arg Cys Met Leu Thr Leu Leu Gly Leu Ser Phe lie Leu 50 55 60

Ala Gly Leu lie Val Gly Gly Ala Cys lie Tyr Lys Tyr Phe Met Pro 65 70 75 80

Lys Ser Thr lie Tyr Arg Gly Glu Met Cys Phe Phe Asp Ser Glu Asp 85 90 95 Pro Ala Asn Ser Leu Arg Gly Gly Glu Pro Asn Phe Leu Pro Val Thr 100 105 110

Glu Glu Ala Asp lie Arg Glu Asp Asp Asn lie Ala lie lie Asp Val

115 120 125

Pro Val Pro Ser Phe Ser Asp Ser Asp Pro Ala Ala lie lie His Asp 130 135 140

Phe Glu Lys Gly Met Thr Ala Tyr Leu Asp Leu Leu Leu Gly Asn Cys

145 150 155 160

Tyr Leu Met Pro Leu Asn Thr Ser lie Val Met Pro Pro Lys Asn Leu

165 170 175 Val Glu Leu Phe Gly Lys Leu Ma Ser Gly Arg Tyr Leu Pro Gin Thr

180 185 190

Tyr Val Val Arg Glu Asp Leu Val Ala Val Glu Glu lie Arg Asp Val

195 200 205

Ser Asn Leu Gly lie Phe lie Tyr Gin Leu Cys Asn Asn Arg Lys Ser 210 215 220

Phe Arg Leu Arg Arg Arg Asp Leu Leu Leu Gly Phe Asn Lys Arg Ala 225 230 235 240 lie Asp Lys Cys Trp Lys lie Arg His Phe Pro Asn Glu Phe lie Val 245 250 255 Glu Thr Lys He Cys Gin Glu 260

Claims

What is claimed is:

1. An isolated polynucleotide comprising a nucleotide sequence that has at least 86% identity over its entire length to a nucleotide sequence encoding the CBCCFG03 polypeptide of SEQ ID NO:2; or a nucleotide sequence complementary to said isolated polynucleotide.

2. The polynucleotide of claim 1 wherein said polynucleotide comprises the nucleotide sequence contained in SEQ ID NOJ encoding the CBCCFG03 polypeptide of SEQ ID N02.

3. The polynucleotide of claim 1 wherein said polynucleotide comprises a nucleotide sequence that is at least 86% identical to that of SEQ ID NO: 1 over its entire length.

4. The polynucleotide of claim 3 which is polynucleotide of SEQ ID NO: 1.

5. The polynucleotide of claim 1 which is DNA or RNA.

6. A DNA or RNA molecule comprising an expression system, wherein said expression system is capable of producing a CBCCFG03 polypeptide comprising an amino acid sequence, which has at least 95% identity with the polypeptide of SEQ ID NO:2 when said expression system is present in a compatible host cell.

7. A host cell comprising the expression system of claim 6.

8. A process for producing a CBCCFG03 polypeptide comprising culturing a host of claim 7 under conditions sufficient for the production of said polypeptide and recovering the polypeptide from the culture.

9. A process for producing a cell which produces a CBCCFG03 polypeptide thereof comprising transforming or transfecting a host cell with the expression system of claim 6 such that the host cell, under appropriate culture conditions, produces a CBCCFG03 polypeptide.

10. A CBCCFG03 polypeptide comprising an amino acid sequence which is at least 95% identical to the amino acid sequence of SEQ ID NO:2 over its entire length.

11. The polypeptide of claim 10 which comprises the amino acid sequence of SEQ ID NO:2.

12. An antibody immunospecific for the CBCCFG03 polypeptide of claim 10.

13. A method for the treatment of a subject in need of enhanced activity or expression of CBCCFG03 polypeptide of claim 10 comprising:

(a) administering to the subject a therapeutically effective amount of an agonist to said polypeptide; and or

(b) providing to the subject an isolated polynucleotide comprising a nucleotide sequence that has at least 86% identity to a nucleotide sequence encoding the CBCCFG03 polypeptide of SEQ ID NO:2 over its entire length; or a nucleotide sequence complementary to said nucleotide sequence in a form so as to effect production of said polypeptide activity in vivo.

14. A method for the treatment of a subject having need to inhibit activity or expression of CBCCFG03 polypeptide of claim 10 comprising: (a) administering to the subject a therapeutically effective amount of an antagonist to said polypeptide; and/or

(b) administering to the subject a nucleic acid molecule that inhibits the expression of the nucleotide sequence encoding said polypeptide; and/or

(c) administering to the subject a therapeutically effective amount of a polypeptide that competes with said polypeptide for its ligand, substrate , or receptor.

15. A process for diagnosing a disease or a susceptibility to a disease in a subject related to expression or activity of CBCCFG03 polypeptide of claim 10 in a subject comprising:

(a) determining the presence or absence of a mutation in the nucleotide sequence encoding said CBCCFG03 polypeptide in the genome of said subject; and/or

(b) analyzing for the presence or amount ofthe CBCCFG03 polypeptide expression in a sample derived from said subject.

16. A method for identifying compounds which inhibit (antagonize) or agonize the CBCCFG03 polypeptide of claim 10 which comprises:

(a) contacting a candidate compound with cells which express the CBCCFG03 polypeptide (or cell membrane expressing CBCCFG03 polypeptide) or respond to CBCCFG03 polypeptide; and

(b) observing the binding, or stimulation or inhibition of a functional response; or compaiϊng the ability ofthe cells (or cell membrane) which were contacted with the candidate compounds with the same cells which were not contacted for CBCCFG03 polypeptide activity.

17. An agonist identified by the method of claim 16.

18. .An antagonist identified by the method of claim 16.

19. A recombinant host cell produced by a method of Claim 9 or a membrane thereof expressing a CBCCFG03 polypeptide.