PBD1 (PROTEASOME SUBUNIT PRGB); peptidase. Identical to Proteasome subunit beta type-2-A (PBD1) [Arabidopsis Thaliana] (GB:O23714); similar to PBD2 (20S PROTEASOME BETA SUBUNIT 2), peptidase [Arabidopsis thaliana] (TAIR:AT4G14800.1); similar to unknown [Populus trichocarpa x Populus deltoides] (GB:ABK96308.1); contains InterPro domain Proteasome, beta-type subunit, conserved site (InterPro:IPR016050); contains InterPro domain 20S proteasome, A and B subunits; (InterPro:IPR001353)