Probable core component of cullin-based SCF-like E3 ubiquitin-protein ligase complexes which mediate the ubiquitination and subsequent proteasomal degradation of target proteins. In association with rbx-2 seems to be involved in meiotic cell cycle progression in the germline. Required for phosphorylation of the MAP kinase MPK-1 in the germline. Protein modification; protein ubiquitination. Interacts with rbx-1 and rbx-2. Neddylated; which enhances the ubiquitination activity of SCF-like complex. Belongs to the cullin family.