Functions as a regulator of cell cycle progression by stabilizing the FBXO5 protein and promoting cyclin-A accumulation during interphase. May play a role in cytokinesis (By similarity). Dimeric and monomeric. Interacts with alpha- and gamma-tubulin. Interacts with FBXO5. Interacts with the chromosome passenger complex (CPC) which is at least composed of AURKB/aurora-B, BIRC5/survivin, CDCA8/borealin and INCENP (By similarity). Associates with the mitotic spindle through anaphase and remains within the midzone and midbody until completion of cytokinesis. Widely expressed. Detected in the embryo from 7 dpc to 17 dpc. Probably phosphorylated by PLK1; may be required for degradation during mitosis. Ubiquitinated. Degradation during prophase is ubiquitin-dependent (By similarity). This gene is a common site of retroviral integration in T-cell lymphomas of AKXD mice.