The proteasome is a multicatalytic proteinase complex which is characterized by its ability to cleave peptides with Arg, Phe, Tyr, Leu, and Glu adjacent to the leaving group at neutral or slightly basic pH. The proteasome has an ATP-dependent proteolytic activity (By similarity). PSA6_TOBAC 20S proteasome alpha subunit A 246 PSA1 PAA1 20S proteasome subunit alpha-1 Proteasome subunit alpha type-6 MSRGSGGGYDRHITIFSPEGRLFQVEYAFKAVKAAGITSIGVRGKDSVCVVTQKKVPDKLLDQTSVSHLFPITKYLGLLATGMTADARTLVQQARNEAAEFRFKYGYEMPVDVLSKWIADKSQVYTQHAYMRPLGVVAMILGIDEEKGPQLFKCDPAGHFFGHKATSAGSKEQEAINFLEKKMKNDPAFSYEETVQTAISALQSVLQEDFKASEIEVGVVKKEDPIFRVLTTEEIDEHLTAISERD