CDK4 siRNA – Cyclin-Dependent Kinase 4 (Human)

The protein encoded by this gene is a member of the Ser/Thr protein kinase family. This protein is highly similar to the gene products of S. cerevisiae cdc28 and S. pombe cdc2. It is a catalytic subunit of the protein kinase complex that is important for cell cycle G1 phase progression. The activity of this kinase is restricted to the G1-S phase, which is controlled by the regulatory subunits D-type cyclins and CDK inhibitor p16(INK4a). This kinase was shown to be responsible for the phosphorylation of retinoblastoma gene product (Rb). Mutations in this gene as well as in its related proteins including D-type cyclins, p16(INK4a) and Rb were all found to be associated with tumorigenesis of a variety of cancers. Multiple polyadenylation sites of this gene have been reported. [provided by RefSeq, Jul 2008]

CDK4: a protein kinase of the CDK family that is important for cell cycle G1 phase progression. Its activity is restricted to the G1-S phase. Controlled by the regulatory subunits D-type cyclins and CDK inhibitor p16(INK4a). Phosphorylates the retinoblastoma gene product (Rb). Point mutations found in somatic and familial melanoma. Amplified in sarcomas, glioma and lymphoma. Amplified, methylated or deleted in head and neck squamous cell carcinoma. Overexpression drives epithelial tumors in mice. Disruption makes mice resistant to cancer. Inhibitor: PD332991.

Protein type: Protein kinase, CMGC; EC 2.7.11.22; Protein kinase, Ser/Thr (non-receptor); Cell cycle regulation; Kinase, protein; CMGC group; CDK family; CDK/CDK4 subfamily; CDK4 subfamily

Chromosomal Location of Human Ortholog: 12q14

Cellular Component: nucleoplasm; transcription factor complex; nuclear membrane; tight junction; perinuclear region of cytoplasm; nucleolus; cyclin-dependent protein kinase holoenzyme complex; chromatin; nucleus; cytosol

Molecular Function: cyclin binding; protein binding; cyclin-dependent protein kinase activity; protein complex binding; cyclin-dependent protein kinase regulator activity; ATP binding

Biological Process: circadian rhythm; lens development in camera-type eye; response to drug; organ regeneration; establishment and/or maintenance of chromatin architecture; positive regulation of translation; positive regulation of cell size; positive regulation of apoptosis; response to toxin; response to testosterone stimulus; signal transduction; protein amino acid phosphorylation; positive regulation of fibroblast proliferation; response to hyperoxia; cell division; regulation of gene expression; positive regulation of cell proliferation; response to lead ion; mitotic cell cycle; regulation of protein kinase activity; G1/S transition of mitotic cell cycle

Disease: Melanoma, Cutaneous Malignant, Susceptibility To, 3