Predicted to be involved in positive regulation of proteasomal ubiquitin-dependent protein catabolic process; protein ubiquitination; and ubiquitin-dependent protein catabolic process. Predicted to be located in cytosol; nucleolus; and nucleoplasm. Is expressed in several structures, including alimentary system; brain; eye; genitourinary system; and hemolymphoid system gland. Orthologous to human NUB1 (negative regulator of ubiquitin like proteins 1). [provided by Alliance of Genome Resources, Apr 2022]