F-box-like protein which is required for entry into mitosis. Acts by participating in E3 ligase complexes that mediate the ubiquitination and degradation of WEE1 kinase at G2/M phase (By similarity). Protein modification; protein ubiquitination. Interacts with SKP1. Part of a SCF (SKP1-cullin-F-box) protein ligase complex. The KEN box is required for the association with the APC/C-Cdh1 complex. Ubiquitinated and degraded by the APC/C-Cdh1 complex.