Predicted to enable cysteine-type endopeptidase activity; thiol-dependent deubiquitinase; and ubiquitin binding activity. Predicted to be involved in positive regulation of proteasomal ubiquitin-dependent protein catabolic process and protein K48-linked deubiquitination. Predicted to act upstream of or within proteolysis. Predicted to be active in cytosol and nucleus. Orthologous to human USP5 (ubiquitin specific peptidase 5). [provided by Alliance of Genome Resources, Apr 2022]