Plays a role in microtubule organization (PubMed:15616186). Required for centriole subdistal appendage assembly (PubMed:28422092). Interacts with CCDC68 and CCDC120; leading to recruitment to centrosomes (PubMed:28422092). Interacts with PLK1 (PubMed:15616186). Interacts with NIN (By similarity). Interacts with FHDC1 (By similarity). Interacts with CCDC61 (PubMed:30354798, PubMed:31789463). Interacts with TBK1; efficient complex formation may be dependent on the presence of CCDC61 (PubMed:30354798). Associated with the mature mother centriole. Associated with spindle microtubules during mitosis. Localizes to the distal appendage region of the centriole (PubMed:31789463). Localizes at the centriole proximal ends (PubMed:31789463). Phosphorylated; probably by PLK1. Belongs to the CEP170 family.