May be a 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. Protein modification; protein ubiquitination. Specifically expressed in testis (PubMed:15460110). Localizes to spermatogenic cells in testis, with highest expression in round spermatids and condensing spermatids and lower expression in pachytene spermatocytes (PubMed:15204681, PubMed:15460110). Expressed in testis from 3 weeks of age onwards, reaching maximum levels by 4 to 5 weeks of age. The SOCS box domain mediates the interaction with the Elongin BC complex, an adapter module in different E3 ubiquitin-protein ligase complexes. Belongs to the ankyrin SOCS box (ASB) family.