Immunogen sequence: DSEGEEGEYS EEENSKVELK SEANDAVNSS TKEEKGEEKP DTKSTVTGER QSGDGQESTE PVENKVGKKG PKHLDDDEDR KNPAYIPRKG LFFEHDLR. The 26S proteasome is a multicatalytic proteinase complex with a highly ordered structure composed of 2 complexes, a 20S core