Centrosomal protein of 55 kDais aproteinthat in humans is encoded by theCEP55gene. CEP55 is a mitotic phosphoprotein that plays a key role in cytokinesis, the final stage of cell division. Interacts (phosphorylated on Ser-425 and Ser-428) with PLK1. Interacts with AKAP9, the interaction occurs in interphase and is lost upon mitotic entry. Interacts with PCNT, the interaction occurs in interphase and is lost upon mitotic entry. Interacts with PDCD6IP, the interaction is direct, CEP55 binds PDCD6IP in a 2:1 stoechiometry, PDCD6IP competes with TSG101 for the same binding site.