Enables ubiquitin-protein transferase activity. Involved in cellular response to cadmium ion; cellular response to mercury ion; and ubiquitin-dependent protein catabolic process. Predicted to be located in endosome membrane and plasma membrane. Predicted to be active in nucleus. Orthologous to human UBE2D3 (ubiquitin conjugating enzyme E2 D3). [provided by Alliance of Genome Resources, Apr 2022]