Predicted to enable adenosine receptor binding activity; identical protein binding activity; and thiol-dependent deubiquitinase. Predicted to be involved in several processes, including negative regulation of protein ubiquitination; protein localization to cell surface; and spliceosomal tri-snRNP complex assembly. Predicted to act upstream of or within proteolysis. Predicted to be located in cytosol and plasma membrane. Predicted to be active in nucleus. Orthologous to human USP4 (ubiquitin specific peptidase 4). [provided by Alliance of Genome Resources, Apr 2022]