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Ser/Thr-kinase component of cyclin D-CDK4 (DC) complexes that phosphorylate and inhibit members of the retinoblastoma (RB) protein family including RB1 and regulate the cell-cycle during G1/S transition. Phosphorylation of RB1 allows dissociation of the transcription factor E2F from the RB/E2F complexes and the subsequent transcription of E2F target genes which are responsible for the progression through the G1 phase. Hypophosphorylates RB1 in early G1 phase. Cyclin D-CDK4 complexes are major integrators of various mitogenenic and antimitogenic signals. Also phosphorylates SMAD3 in a cell-cycle-dependent manner and represses its transcriptional activity. Component of the ternary complex, cyclin D/CDK4/CDKN1B, required for nuclear translocation and activity of the cyclin D-CDK4 complex.
Gene Name: | cyclin-dependent kinase 4 |
Family/Subfamily: | Protein Kinase , CDC2/CDK |
Synonyms: | CDK4, Cell division protein kinase 4, Crk3, Cyclin-dependent kinase 4, CMM3, p34/cdk4, PSK-J3 |
Target Sequences: | NM_000075 NP_000066.1 P11802 |
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