Required to establish and maintain the arrest of oocytes at the second meiotic metaphase until fertilization. Probably acts by inhibiting the anaphase-promoting complex/cyclosome (APC/C) ubiquitin ligase. Probably recognizes and binds to some phosphorylated proteins and promotes their ubiquitination and degradation. Protein modification; protein ubiquitination. Part of a SCF (SKP1-cullin-F-box) protein ligase complex (By similarity). Interacts with CDC20 (Probable). Present in testis and ovary (at protein level). Expression is high in immature oocytes, and diminishes after oocyte activation. Phosphorylated on Thr-176 and Ser-275 in response to calcium, which is a prerequisite for ubiquitination and proteasomal degradation. Ubiquitinated in response to calcium, which promotes proteasomal degradation.