| Post Translational Modifications | Phosphorylation of Thr-140 or Ser-141 impairs binding to PCNA. Phosphorylation at Ser-112 by GSK3-beta enhances ubiquitination by the DCX(DTL) complex. Phosphorylation of Thr-140 by PIM2 enhances its stability and inhibits cell proliferation. Phosphorylation of Thr-140 by PIM1 results in the relocation of CDKN1A to the cytoplasm and enhanced CDKN1A protein stability. UV radiation-induced phosphorylation at Ser-78 and Ser-141 by NUAK1 leads to its degradation. Ubiquitinated by MKRN1.leading to polyubiquitination and 26S proteasome-dependent degradation. Ubiquitinated by the DCX(DTL) complex, also named CRL4(CDT2) complex, leading to its degradation during S phase or following UV irradiation. Ubiquitination by the DCX(DTL) complex is essential to control replication licensing and is PCNA-dependent: interacts with PCNA via its PIP-box, while the presence of the containing the 'K+4' motif in the PIP box, recruit the DCX(DTL) complex, leading to its degradation. Ubiquitination at Ser-2 leads to degradation by the proteasome pathway. Ubiquitinated by RNF114.leading to proteasomal degradation. Acetylation leads to protein stability. Acetylated in vitro on Lys-136, Lys-149, Lys-156 and Lys-158. Deacetylation by HDAC1 is prevented by competitive binding of C10orf90/FATS to HDAC1. |
| Function | May be involved in p53/TP53 mediated inhibition 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. Inhibits DNA synthesis by DNA polymerase delta by competing with POLD3 for PCNA binding. Plays an important role in controlling cell cycle progression and DNA damage-induced G2 arrest. Plays an important role in controlling cell cycle progression and DNA damage-induced G2 arrest. Involved in p53/TP53 mediated inhibition of cellular proliferation in response to DNA damage. Also involved in p53-independent DNA damage-induced G2 arrest mediated by CREB3L1 in astrocytes and osteoblasts. 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. Inhibits DNA synthesis by DNA polymerase delta by competing with POLD3 for PCNA binding. Negatively regulates the CDK4- and CDK6-driven phosphorylation of RB1 in keratinocytes, thereby resulting in the release of E2F1 and subsequent transcription of E2F1-driven G1/S phase promoting genes. |
| Protein Name | Cyclin-Dependent Kinase Inhibitor 1Cdk-Interacting Protein 1Melanoma Differentiation-Associated ProteinP21 |
| Database Links | Reactome: R-MMU-187577Reactome: -MMU-198323Reactome: -MMU-2559582Reactome: -MMU-2559586Reactome: -MMU-6804116Reactome: -MMU-69202Reactome: -MMU-69231Reactome: -MMU-69563Reactome: -MMU-69656Reactome: -MMU-8852276Reactome: -MMU-9616222 |
| Cellular Localisation | CytoplasmNucleus |
| Alternative Protein Names | Cyclin-Dependent Kinase Inhibitor 1 proteinCdk-Interacting Protein 1 proteinMelanoma Differentiation-Associated Protein proteinP21 proteinCdkn1a proteinCip1 proteinWaf1 protein |
Information sourced from Uniprot.org
