The function of CEP85 (centrosomal protein 85, Ensembl gene identifier ENSG00000130695) is as follows. Acts as a regulator of centriole duplication through a direct interaction with STIL, a key factor involved in the early steps of centriole formation. The CEP85-STIL protein complex acts as a modulator of PLK4-driven cytoskeletal rearrangements and directional cell motility (PubMed:29712910, PubMed:32107292). Acts as a negative regulator of NEK2 to maintain the centrosome integrity in interphase. Suppresses centrosome disjunction by inhibiting NEK2 kinase activity (PubMed:26220856). {ECO:0000269|PubMed:26220856, ECO:0000269|PubMed:29712910, ECO:0000269|PubMed:32107292}.