Immunogen sequence: PIREELVSSD ELRQDKSSGA SSESVQTVNQ AEVESLTVKS ESTGTPGHLR SDTEHSTNEV GTLCHKTDLN NLEMAIKEDQ IADNFQGISG PKE. The proteasome is a multicatalytic proteinase complex with a highly ordered ring-shaped 20S core structure. The core structure is