Predicted to enable ATPase binding activity; ubiquitin binding activity; and ubiquitin protein ligase binding activity. Predicted to contribute to K48-linked polyubiquitin modification-dependent protein binding activity and K63-linked polyubiquitin modification-dependent protein binding activity. Predicted to be involved in several processes, including negative regulation of RIG-I signaling pathway; negative regulation of type I interferon production; and proteolysis involved in cellular protein catabolic process. Predicted to be located in cytosol. Predicted to be part of UFD1-NPL4 complex and VCP-NPL4-UFD1 AAA ATPase complex. Predicted to be active in nucleus. Orthologous to human NPLOC4 (NPL4 homolog, ubiquitin recognition factor). [provided by Alliance of Genome Resources, Apr 2022]