Probable substrate recognition component of a CBC (Cul2-ElonginB-ElonginC) E3 ubiquitin-protein ligase complex which mediates the ubiquitination and subsequent proteasomal degradation of target proteins. Ensures germline precursor cell asymmetry by targeting germline proteins for destruction if expressed in non-germline cells. This process also requires elc-1, cul-2, rbx-1 and ubc-2. Protein modification; protein ubiquitination. Probable component of the CBC(zif-1) E3 ubiquitin-protein ligase complex formed of cul-2, elc-1, rbx-1 and zif-1. Interacts with pie-1, pos-1, mex-1, mex-5, mex-6 and elc-1.