The function of ENSG00000095261 (PSMD5, proteasome 26S subunit, non-ATPase 5) is as follows. Acts as a chaperone during the assembly of the 26S proteasome, specifically of the base subcomplex of the PA700/19S regulatory complex (RC). In the initial step of the base subcomplex assembly is part of an intermediate PSMD5:PSMC2:PSMC1:PSMD2 module which probably assembles with a PSMD10:PSMC4:PSMC5:PAAF1 module followed by dissociation of PSMD5. {ECO:0000269|PubMed:19412159, ECO:0000269|PubMed:19490896}.