Function: E3 ubiquitin-protein ligase mediating 'Lys-48'-and 'Lys-63'-linked polyubiquitination and subsequent proteasomal degradation of modified proteins. May play a role in myelopoiesis.
Subunit: Interacts (via RING-type 1) with UBE2L3. Interacts (via RING-type 2) with UBE2N. Interacts (via RING-type 2) with GFI1B. Interacts with GFI1; prevents its ubiquitination and proteasomal degradation.