Chemistry: molecular biology and microbiology – Micro-organism – tissue cell culture or enzyme using process... – Recombinant dna technique included in method of making a...
Reexamination Certificate
2000-04-19
2001-05-01
Slobodyansky, Elizabeth (Department: 1646)
Chemistry: molecular biology and microbiology
Micro-organism, tissue cell culture or enzyme using process...
Recombinant dna technique included in method of making a...
C435S194000, C435S252300, C435S317100, C435S320100, C435S366000, C536S023500, C536S023200
Reexamination Certificate
active
06225090
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to newly identified polypeptides and polynucleotides encoding such polypeptides, to their use in therapy and in identifying compounds which may be agonists, antagonists and/or inhibitors which are potentially useful in therapy, and to production of such polypeptides and polynucleotides.
BACKGROUND OF THE INVENTION
The drug discovery process is currently undergoing a fundamental revolution as it embraces “functional genomics”, that is, high throughput genome- or gene-based biology. This approach as a means to identify genes and gene products as therapeutic targets is rapidly superseding earlier approaches based on “positional cloning”. A phenotype, that is a biological function or genetic disease, would be identified and this would then be tracked back to the responsible gene, based on its genetic map position.
Functional genomics relies heavily on high-throughput DNA sequencing technologies and the various tools of bioinformatics to identify gene sequences of potential interest from the many molecular biology databases now available. There is a continuing need to identify and characterise further genes and their related polypeptides/proteins, as targets for drug discovery.
SUMMARY OF THE INVENTION
The present invention relates to SVP4b, in particular SVP4b polypeptides and SVP4b polynucleotides, recombinant materials and methods for their production. In another aspect, the invention relates to methods for using such polypeptides and polynucleotides, including the treatment of disease states that involve leucocyte activation and infiltration including diseases such as arthritis, psoriasis, COPD and ARDS, hereinafter referred to as “the Diseases”, amongst others. In a further aspect, the invention relates to methods for identifying agonists and antagonists/inhibitors using the materials provided by the invention, and treating conditions associated with SVP4b imbalance with the identified compounds. In a still further aspect, the invention relates to diagnostic assays for detecting diseases associated with inappropriate SVP4b activity or levels.
DESCRIPTION OF THE INVENTION
In a first aspect, the present invention relates to SVP4b polypeptides. Such peptides include isolated polypeptides comprising an amino acid sequence which has at least 95% identity, most preferably at least 97-99% identity, to that of SEQ ID NO:2 over the entire length of SEQ ID NO:2. Such polypeptides include those comprising the amino acid of SEQ ID NO:2.
Further peptides of the present invention include isolated polypeptides in which the amino acid sequence has at least 95% identity, most preferably at least 97-99% identity, to the amino acid sequence of SEQ ID NO:2 over the entire length of SEQ ID NO:2. Such polypeptides include the polypeptide of SEQ ID NO:2.
Further peptides of the present invention include isolated polypeptides encoded by a polynucleotide comprising the sequence contained in SEQ ID NO: 1.
Polypeptides of the present invention are believed to be members of the adaptor protein family of polypeptides. They are therefore of interest because they are involved in the generation of the important second messenger, phosphatidylinositol 3,4,5-triphosphate (PIP3); PIP3 is generated following the stimulation of various receptors and is involved, for example in leucocytes, in regulating chemotaxis, adherence and degranulation. PIP3 is primarily generated via the action of phosphatidylinositol 3-kinase, several of which are thought to exist however, one that appears to be particularly relevant in leucocytes is directly regulated, i.e. activated by G protein &bgr;&ggr; subunits. Importantly, this regulation is dependent upon a novel adaptor protein, p101. Inhibition of this activation process by, for example, preventing G&bgr;&ggr; binding to p101 should prevent PIP3 accumulation. Such an action would be of benefit in various disease states that involve leucocyte activation and infiltration. These properties are hereinafter referred to as SVP4b activity” or SVP4b polypeptide activity” or “biological activity of SVP4b”. Also included amongst these activities are antigenic and immunogenic activities of said SVP4b polypeptides, in particular the antigenic and immunogenic activities of the polypeptide of SEQ ID NO:2. Preferably, a polypeptide of the present invention exhibits at least one biological activity of SVP4b.
The 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 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.
The present invention also includes include variants of the aforementioned polypeptides, that is polypeptides that vary from the referents by conservative amino acid substitutions, whereby a residue is substituted by another with like characteristics. Typical such substitutions are among Ala, Val, Leu and Ile; among Ser and Thr, among the acidic residues Asp and Glu; among Asn and Gln; 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, 1-3, 1-2 or 1 amino acids are substituted, deleted, or added in any combination.
Polypeptides of the present 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.
In a further aspect, the present invention relates to SVP4b polynucleotides. Such polynucleotides include isolated polynucleotides comprising a nucleotide sequence encoding a polypeptide which has at least 95% identity to the amino acid sequence of SEQ ID NO:2, over the entire length of SEQ ID NO:2. In this regard, polypeptides which have at least 97% identity are highly preferred, whilst those with at least 98-99% identity are more highly preferred, and those with at least 99% identity are most highly preferred. Such polynucleotides include a polynucleotide comprising the nucleotide sequence contained in SEQ ID NO:1 encoding the polypeptide of SEQ ID NO:2.
Further polynucleotides of the present invention include isolated polynucleotides comprising a nucleotide sequence that has at least 95% identity to a nucleotide sequence encoding a polypeptide of SEQ ID NO:2, over the entire coding region. In this regard, polynucleotides which have at least 97% identity are highly preferred, whilst those with at least 98-99% identity are more highly preferred, and those with at least 99% identity are most highly preferred.
Further polynucleotides of the present invention include isolated polynucleotides comprising a nucleotide sequence which has at least 95% identity to SEQ ID NO:1 over the entire length of SEQ ID NO:1. In this regard, polynucleotides which have at least 97% identity are highly preferred, whilst those with at least 98-99% identity are more highly preferred, and those with at least 99% identity are most highly preferred. Such polynucleotides include a polynucleotide comprising the polynucleotide of SEQ ID NO:1 as well as the polynucleotide of SEQ ID NO:1.
The invention also provides polynucleotides which are complementary to all the above described polynucleotides.
The nucleotide sequence of SEQ ID NO:1 is a splice variant of the human p101 gene (EP0899328 SmithKline Beecham), which lacks exons 7b, 9 and 10. The polynucleotide of SEQ ID NO:1 is a cDNA sequence and comprises a polypeptide encoding sequence (nucleotide 296 to 2019) encoding a polypeptide of 575 amino acids, the polypeptide of SEQ ID NO:2. The nucleotide sequence encoding the polypeptide of SEQ ID NO:2 may be identical to the polypeptide encoding sequence contained in SEQ ID NO:1 or it may be a sequence other than the o
Han William T.
King William T.
Ratner & Presia
Slobodyansky Elizabeth
SmithKline Beecham Corporation
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