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Subunit: Interacts with HDAC1; the interaction is prevented by competitive binding of C10orf90/FATS to HDAC1 facilitating acetylation and protein stabilization of CDKN1A/p21 (By similarity). Interacts with MKRN1. Interacts with PSMA3. Interacts with PCNA. Component of the ternary complex, cyclin D-CDK4-CDKN1A. Interacts (via its N-terminal domain) with CDK4; the interaction promotes the assembly of the cyclin D-CDK4 complex, its nuclear translocation and promotes the cyclin D-dependent enzyme activity of CDK4. Binding to CDK2 leads to CDK2/cyclin E inactivation at the G1-S phase DNA damage checkpoint, thereby arresting cells at the G1-S transition during DNA repair. Interacts with PIM1 Sequence caution: Sequence=AAB59559.1; Type=Erroneous initiation; Note=Translation N-terminally shortened; Sequence=AAB59560.1; Type=Erroneous initiation; Note=Translation N-terminally shortened;
Tissue specificity: Expressed in all adult tissues, with 5-fold lower levels observed in the brain [IMAGE] Pathway & Disease-focused RT2 Profiler PCR Arrays including CDKN1A (see all 32): Lung Cancer in human mouse rat Prostate Cancer in human mouse rat Stress & Toxicity Pat
Function: UniProtKB/Swiss-Prot Summary: CDN1A_HUMAN, P38936 Function: May be the important intermediate by which p53/TP53 mediates its role as an inhibitor of cellular proliferation in response to DNA damage. Binds to and inhibits cyclin-dependent kinase activity, preventing phosphorylation of critical cyclin-dependent kinase substrates and blocking cell cycle progression. Functions in the nuclear localization and assembly of cyclin D-CDK4 complex and promotes its kinase activity towards RB1. At higher stoichiometric ratios, inhibits the kinase activity of the cyclin D-CDK4 complex
Similarity: Belongs to the CDI family [IMAGE]
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