Cyclin-dependent kinase 2-associated protein 1 (CDK2AP1)

Cyclin-dependent kinase 2-associated protein 1 (CDK2AP1) is a multifunctional protein that negatively regulates cyclin-dependent kinase 2 (CDK2) through direct binding, sequestration, and promoting proteolysis, thereby enforcing the G1 to S-phase checkpoint and suppressing uncontrolled proliferation[1][2][3][5]. It additionally interacts with DNA polymerase alpha/primase and modulates DNA replication in S-phase. CDK2AP1 is also a core subunit of the NuRD (nucleosome remodeling and histone deacetylation) complex, supporting embryonic stem cell differentiation via epigenetic silencing of pluripotency genes such as Oct4 and suppressing Wnt signaling pathways[1]. Downregulation of CDK2AP1 (e.g., through microRNA-21) correlates with increased tumor proliferation, invasion, and poor differentiation in several cancers, and restoration promotes cell cycle arrest and apoptosis[1]. In fibroblasts, loss results in p53-dependent senescence[1]. Therefore, CDK2AP1 is both a cell cycle inhibitor and a chromatin regulator implicated as a tumor suppressor and regulator of stem cell fate[1][3][5].

Other names

DOC1DORC1ST19doc-1p12DOC-1Deleted in oral cancer 1Putative oral cancer suppressorCDK2-associated protein 1

Inhibition of CDK2 activity (enforces G1/S checkpoint), Promotion of cell cycle arrest and apoptosis, Modulation of epigenetic pathways (via NuRD complex), Regulation of DNA replication