function:Plays a role in mitotic exit and cytokinesis. Not required for microtubule nucleation. Recruits PDCD6IP and TSG101 to midbody during cytokinesis. ,PTM:There is a hierachy of phosphorylation , where both Ser-425 and Ser-428 are phosphorylated at the onset of mitosis , prior to Ser-436. Phosphorylation at Ser-425 and Ser-428 is required for dissociation from the centrosome at the G2/M boundary. Phosphorylation at the 3 sites , Ser-425 , Ser-428 and Ser-436 , is required for protein function at the final stages of cell division to complete cytokinesis successfully. ,subcellular location:Present at the centrosomes at interphase. A small portion is associated preferentially with the mother centriole , whereas the majority localizes to the pericentriolar material. During mitosis , loss of affinity for the centrosome at the onset of prophase and diffusion throughout the cell. This dissociation from the centrosome is phosphorylation-dependent. May remain localized at the centrosome during mitosis in certain cell types. Appears at the cleavage furrow in late anaphase and in the midbody in cytokinesis. ,subunit:Homodimer. 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. Interacts with TSG101; TSG101 competes with PDCD6IP for the same binding site; interaction is required for cytokinesis but not for viral budding. Interacts with FAM125A , VPS37B , VPS37C and VPS28. ,tissue specificity:Widely expressed , mostly in proliferative tissues. Highly expressed in testis. Intermediate levels in adult and fetal thymus , as well as in various cancer cell lines. Low levels in different parts of the digestive tract , bone marrow , lymph nodes , placenta , fetal heart and fetal spleen. Hardly detected in brain. ,
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