Required for normal progression through mitosis. Required for normal congress of chromosomes at the metaphase plate, and for normal rate of chromosomal segregation during anaphase. Plays a role in the regulation of mitotic spindle dynamics. Increases the rate of turnover of microtubules on metaphase spindles, and contributes to the generation of normal tension across sister kinetochores. Recruits KIF2A and ANKRD53 to the mitotic spindle and spindle poles. May participate in p53/TP53-regulated growth suppression. Interacts with APC2 (By similarity). Interacts with KIF2A (PubMed:18411309). Interacts with ANKRD53; recruits ANKRD53 to the spindle during mitosis (PubMed:26820536). Detected at the mitotic spindle and spindle poles. Diffusely distributed throughout the cell during interphase. Widely expressed in adult and fetal tissues, with highest expression in the adult brain and fetal thymus. Not detected in adult skeletal muscle. Phosphorylated during mitosis. Belongs to the PSRC1 family.