PMSB1 is an alias for the gene, Proteasome subunit beta 1, in humans. Other names include: Proteasome subunit beta type-1; Multicatalytic endopeptidase complex subunit C5; Proteasome component C5; Proteasome gamma chain; Macropain subunit C5; Proteasome subunit beta type-1 ; proteasome (prosome, macropain) subunit, beta type, 1. The encoded protein is an enzyme with an amino acid length of 241 and a mass of 26.5 kDa. PMSB1 is a member of the Peptidase T1B family. This gene shares homology with other species, including: Mouse, Fly, Rat, Zebrafish, Frog, Chicken.