FUNCTION Required for normal spindle assembly (PubMed:21406398, PubMed:21983783, PubMed:26297806, PubMed:35793002). Plays a key role in mother-centriole-dependent centriole duplication; the function seems also to involve CEP152, CDK5RAP2 and WDR62 through a stepwise assembled complex at the centrosome that recruits CDK2 required for centriole duplication (PubMed:21983783, PubMed:26297806). Reported to be required for centrosomal recruitment of CEP152; however, this function has been questioned (PubMed:21983783, PubMed:26297806). Also recruits CDK1 to centrosomes (PubMed:21406398). Plays a role in DNA damage response (PubMed:21406398). Following DNA damage, such as double-strand breaks (DSBs), is removed from centrosomes; this leads to the inactivation of spindle assembly and delay in mitotic progression (PubMed:21406398). Promotes stabilization of FXR1 protein by inhibiting FXR1 ubiquitination (PubMed:35989368).SUBUNIT Interacts with CEP152 and CDK1; these interactions recruit both ligands to centrosomes (PubMed:21406398). Interacts with CDK2, CDK5RAP2, WDR62, CEP90, KIAA0753/moonraker and CCDC14 (PubMed:21406398, PubMed:26297806). CEP63, CDK5RAP2, CEP152, WDR62 are proposed to form a stepwise assembled complex at the centrosome forming a ring near parental centrioles (PubMed:21406398, PubMed:21983783, PubMed:26297806). Interacts with CCDC57; the interaction is required for their location to proximal end of centrioles (PubMed:32402286). Interacts with FXR1; promoting its stabilization (PubMed:35989368).SUBUNIT (Microbial infection) Interacts with zika virus serine protease NS3; this interaction disorganizes the centrosome.INTERACTION Colocalizes with CDK5RAP2, CEP152 and WDR62 in a discrete ring around the proximal end of the parental centriole. At this site, a cohesive structure is predicted to engage parental centrioles and procentrioles.ALTERNATIVE PRODUCTS Polyubiquitinated via 'Lys-48'-linked ubiquitin, leading to its degradation (PubMed:35989368). Deubiquitinated by USP36, promoting its stabilization (PubMed:35989368).DISEASE The disease is caused by variants affecting the gene represented in this entry.MISCELLANEOUS CEP63 and DEUP1 paralogs are both involved in centriole amplification: while CEP63 mediates mother-centriole-dependent centriole duplication, DEUP1 mediates de novo centriole amplification in multiciliated cells.SIMILARITY Belongs to the CEP63 family.
