During mitosis, may play a role in the control of metaphase-to-anaphase transition. Isoform 1 and isoform 2 interact with PICALM; this interaction may target PICALM to the nucleus (PubMed:16491119). During mitosis, associates with HDAC2 and MTA2 subunits of the chromatin-remodeling NuRD complex; this association is strongest at prometaphase and decreases as the cell progresses through metaphase and anaphase (PubMed:18757745). Partially localizes to the nucleolus. Expressed in thymus (at protein level). Detected in spleen, colon, ovary and small intestines. Regulated in a cell-cycle dependent manner, with lowest levels in quiescent cells or at G1 phase. Progressive up-regulation starting at S phase and peaking at G2 and G2/M phases, followed by a drastic drop as cells exit mitosis (at protein level). The N-terminal destruction box 2 (D-box 2) is required for APC/C ubiquitination and proteasomal degradation. Ubiquitinated by the anaphase-promoting complex/cyclosome (APC/C) complex in the presence of FZR1, leading to its degradation by the proteasome during mitotic exit. However, degradation is not essential for normal mitotic progression within a single cell cycle.