Predicted to enable protein tag and ubiquitin protein ligase binding activity. Predicted to be involved in modification-dependent protein catabolic process; positive regulation of protein monoubiquitination; and protein ubiquitination. Predicted to act upstream of or within several processes, including animal organ development; energy homeostasis; and meiosis I. Predicted to be located in mitochondrion; neuron projection; and neuronal cell body. Predicted to be active in cytoplasm and nucleus. Orthologous to human UBB (ubiquitin B). [provided by Alliance of Genome Resources, Apr 2022]