Potential coactivator of the androgen receptor. May play critical roles in two RAB6-dependent retrograde transport processes: one from endosomes to the Golgi and the other from the Golgi to the ER (By similarity). Mediates STAT3 degradation. Component of the SNF/SWI transcription factor complexes (By similarity). Interacts with RAB6A. Interacts with TCEB1 (By similarity). Interacts with STAT3 and FER. Interacts with TRNP1; may regulate TRNP1 proteasomal degradation. Concentrated at the budding structures localized at the tips of cisternae. The Elongin BC complex binding domain is also known as BC-box with the consensus [APST]-L-x(3)-C-x(3)-[AILV]. Phosphorylated by FER.