The function of Ensembl gene identifier ENSG00000110801 (PSMD9, proteasome 26S subunit, non-ATPase 9) 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). During the base subcomplex assembly is part of an intermediate PSMD9:PSMC6:PSMC3 module, also known as modulator trimer complex; PSMD9 is released during the further base assembly process. .