Recombinant Human Cyclin D1 protein (Tagged)

Specifications

Form

Liquid

Additional notes

Affinity purified.

General info

Function

The protein expressed by the CCND1 gene acts as a regulatory component of the cyclin D1-CDK4 (DC) complex, which phosphorylates and inhibits retinoblastoma (RB) protein family members, including RB1, regulating the cell cycle during the G(1)/S transition. Phosphorylation of RB1 allows the transcription factor E2F to dissociate from the RB/E2F complex, enabling transcription of E2F target genes responsible for G(1) phase progression. In early G(1) phase, it hypophosphorylates RB1. Cyclin D-CDK4 complexes integrate various mitogenic and antimitogenic signals. The protein also serves as a substrate for SMAD3, phosphorylating it in a cell-cycle-dependent manner to repress its transcriptional activity, and forms part of the cyclin D1/CDK4/CDKN1B complex necessary for nuclear translocation and activity. Additionally, it exhibits transcriptional corepressor activity with INSM1 on the NEUROD1 and INS promoters, independent of the cell cycle. This supplementary information is collated from multiple sources and compiled automatically.

Sequence similarities

Belongs to the cyclin family. Cyclin D subfamily.

Post-translational modifications

Phosphorylation at Thr-286 by MAP kinases is required for ubiquitination and degradation by the DCX(AMBRA1) complex (PubMed:10766840, PubMed:33854232, PubMed:33854235, PubMed:33854239). It also plays an essential role for recognition by the FBXO31 component of SCF (SKP1-cullin-F-box) protein ligase complex following DNA damage (PubMed:19412162).. Ubiquitinated at Lys-269 by the DCX(AMBRA1) complex during the transition from G1 to S cell phase, leading to its degradation: ubiquitination is dependent on Thr-286 phosphorylation (PubMed:33854232, PubMed:33854235, PubMed:33854239). The DCX(AMBRA1) complex represents the major regulator of CCND1 stability during the G1/S transition (PubMed:33854232, PubMed:33854235, PubMed:33854239). Also ubiquitinated by a SCF (SKP1-CUL1-F-box protein) ubiquitin-protein ligase complex containing FBXO4 and CRYAB (By similarity). Following DNA damage it is ubiquitinated by some SCF (SKP1-cullin-F-box) protein ligase complex containing FBXO31 (PubMed:19412162). SCF-type ubiquitination is dependent on Thr-286 phosphorylation (PubMed:10766840, PubMed:19412162). Ubiquitinated also by UHRF2 apparently in a phosphorylation-independent manner (PubMed:21952639). Ubiquitination leads to its degradation and G1 arrest. Deubiquitinated by USP2; leading to its stabilization (PubMed:19917254).

Subcellular localisation

Nucleus