Predicted to enable proteasome binding activity. Involved in cellular protein metabolic process; positive regulation of I-kappaB kinase/NF-kappaB signaling; and positive regulation of apoptotic process. Acts upstream of or within response to interferon-gamma and response to tumor necrosis factor. Located in cytoplasm and nucleus. Is expressed in alimentary system; aorta; male reproductive gland or organ; olfactory lobe; and thymus. Orthologous to human UBD (ubiquitin D). [provided by Alliance of Genome Resources, Apr 2022]