eLife Assessment
The study presents a valuable finding on the ubiquitin-dependent regulatory loop in which proapoptotic Bim is targeted to the E3 ubiquitin ligase Cul5-Wsb2-mediated degradation through its sequestration by BCL2 proteins. The conclusions are supported by incomplete evidence and would benefit from additional experiments addressing both the mechanistic understanding and the physiological/cancer-related significance of the study.