Required to prevent anaphase onset in cytostatic factor-arrested oocytes. Inhibits the anaphase-promoting complex/cyclosome (APC/C) ubiquitin ligase and prevents cyclin degradation. 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. Accumulates during oocyte maturation. Phosphorylated on Thr-195 by CaMK2 in response to calcium during egg activation, which promotes subsequent phosphorylation by PLK1, ubiquitination and protesomal degradation. Ubiquitinated by FBXW1 during egg activation, which promotes proteasomal degradation. Sequencing errors.