Substrate-specific adapter of a BCR (BTB-CUL3-RBX1) E3 ubiquitin-protein ligase complex involved in regulation of cytoskeleton structure. The BCR(TNFAIP1) E3 ubiquitin ligase complex mediates the ubiquitination of target proteins, leading to their degradation by the proteasome (By similarity). Protein modification; protein ubiquitination. Component of the BCR(TNFAIP1) E3 ubiquitin ligase complex, at least composed of cul3, tnfaip1/bacurd2 and rbx1. Belongs to the BACURD family.