| proto-oncogene protein p21(ras) | Cellular protein encoded by the c-ras genes. The protein has GTPase activity and is involved in transmembrane signal transduction as a guanine nucleotide binding protein. Elevated levels of p21 c-ras have been associated with neoplasia. (12 Dec 1998) |
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| proto-oncogene protein pp60(c-src) | <enzyme> Membrane-associated tyrosine-specific kinase encoded by the c-src genes. It has an important role in cellular growth control. Truncation of carboxy-terminal residues in pp60(c-src) leads to pp60(v-src) which has the ability to transform cells. This kinase pp60 c-src should not be confused with csk, also known as c-src kinase. Registry number: EC 2.7.1.- (12 Dec 1998) |
| oncogene protein gp140(v-fms) | Transforming glycoprotein coded by the fms oncogene from the susan mcdonough strain of feline sarcoma virus (sm-fesv). The oncogene protein v-fms lacks sequences, which, in the highly homologous proto-oncogene protein c-fms (csf-1 receptor), normally serve to regulate its tyrosine kinase activity. The missing sequences in v-fms mimic the effect of ligand and lead to constitutive cell growth. The protein gp120(v-fms) is post-translationally modified to generate gp140(v-fms). (12 Dec 1998) |
| oncogene protein p21(ras) | Transforming protein encoded by ras oncogenes. Point mutations in the cellular ras gene (c-ras) can also result in a mutant p21 protein that can transform mammalian cells. Oncogene protein p21(ras) has been directly implicated in human neoplasms, perhaps accounting for as much as 15-20% of all human tumours. (12 Dec 1998) |
| oncogene protein p55(v-myc) | Transforming protein coded by myc oncogenes. The v-myc protein has been found in several replication-defective avian retrovirus isolates which induce a broad spectrum of malignancies. (12 Dec 1998) |
| oncogene protein p65(gag-jun) | Transforming protein coded by jun oncogenes (genes, jun). This is a gag-onc fusion protein of about 65 kD derived from avian sarcoma virus. V-jun lacks a negative regulatory domain that regulates transcription in c-jun. (12 Dec 1998) |
| oncogene protein pp60(v-src) | <chemical> Tyrosine-specific protein kinase encoded by the v-src oncogene of rous sarcoma virus. The transforming activity of pp60(v-src) depends on both the lack of a critical carboxy-terminal tyrosine phosphorylation site at position 527, and the attachment of pp60(v-src) to the plasma membrane which is accomplished by myristylation of its n-terminal glycine. Chemical name: Kinase (phosphorylating), protein pp60src (12 Dec 1998) |
| recessive oncogene | <molecular biology> A single copy of this gene issufficient to suppress cell proliferation, the loss of both copies of the gene contributes to cancer formation. (09 Oct 1997) |
| viral oncogene | <molecular biology> A viral gene that contributes to cancer development in vertebrate hosts. (09 Oct 1997) |
| cellular oncogene | <molecular biology> A normal gene that, when mutated or improperly expressed, can cause cancer to develop. (09 Oct 1997) |
| c-oncogene | <molecular biology> A normal gene which has a tumour-producing insert that may have originated from a virus in it, turning it into a proto-oncogene. When these genes are sufficiently mutated, amplified, or over-expressed (transcribed too many times), they can begin to produce cancers. (05 Jan 1998) |
| proto-oncogene | <molecular biology> The normal, cellular equivalent of an oncogene, thus usually a gene involved in the signalling or regulation of cell growth. In general, cellular proto-oncogenes are prefixed with a c, rather than their abnormal viral counterparts, that are prefixed with a v, for example c myc and v myc. They are fragments of DNA, related to oncogenes but are the normal switches used to control growth and tissue repair. (06 Oct 1997) |
| proto-oncogene proteins | Products of proto-oncogenes. Normally they do not have oncogenic or transforming properties, but are involved in the regulation or differentiation of cell growth. They often have protein kinase activity. (12 Dec 1998) |
| proto-oncogene proteins c-abl | Membrane proteins encoded by the c-abl genes. They exhibit tyrosine kinase activity and play a role in normal haematopoiesis especially of the myeloid lineage. Oncogenic transformation of c-abl arises when specific n-terminal amino acids are deleted, releasing the kinase from negative regulation. (12 Dec 1998) |
| proto-oncogene proteins c-bcl-2 | Membrane proteins encoded by the bcl-2 genes and serving as a potent inhibitor of cell death by apoptosis. The proteins are found on mitochondrial, microsomal, and nuclear membrane sites within many cell types. Overexpression of bcl-2 proteins, due to a translocation of the gene, is associated with follicular lymphoma. (12 Dec 1998) |