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Regulatory component of the cyclin D1-CDK4 (DC) complex that phosphorylates and inhibits members of the retinoblastoma (RB) protein family including RB1 and regulates the cell-cycle during G1/S transition. Phosphorylation of RB1 allows dissociation of the transcription factor E2F from the RB/E2F complex 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 substrate for SMAD3, phosphorylating SMAD3 in a cell-cycle-dependent manner and repressing its transcriptional activity. Component of the ternary complex, cyclin D1/CDK4/CDKN1B, required for nuclear translocation and activity of the cyclin D-CDK4 complex. Exhibits transcriptional corepressor activity with INSM1 on the NEUROD1 and INS promoters in a cell cycle-independent manner.
Gene Name: | cyclin D1 |
Synonyms: | CCND1, B-cell lymphoma 1 protein, BCL-1 oncogene, B-cell CLL/lymphoma 1, BCL-1, Cyclin D1, G1/S-specific cyclin-D1, U21B31, PRAD1, BCL1, D11S287E, PRAD1 oncogene |
Target Sequences: | NM_053056 NP_444284.1 P24385 |
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