Predicted to enable enzyme regulator activity. Predicted to be involved in proteasome-mediated ubiquitin-dependent protein catabolic process. Predicted to act upstream of or within regulation of protein catabolic process. Predicted to be part of proteasome regulatory particle, base subcomplex. Predicted to be active in nucleus and proteasome storage granule. Orthologous to human PSMD2 (proteasome 26S subunit ubiquitin receptor, non-ATPase 2).