Probable substrate-recognition component of a SCF-like ECS (Elongin-Cullin-SOCS-box protein) E3 ubiquitin-protein ligase complex which mediates the ubiquitination and subsequent proteasomal degradation of target proteins. {ECO:0000250, ECO:0000269|PubMed:16325183}. This is the function of ASB12 (ankyrin repeat and SOCS box containing 12, ENSG00000198881).