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The proteasome is a multicatalytic proteinase complex with a highly ordered ring-shaped 20S core structure. The core structure is composed of 4 rings of 28 non-identical subunits\; 2 rings are composed of 7 alpha subunits and 2 rings are composed of 7 beta subunits. Proteasomes are distributed throughout eukaryotic cells at a high concentration and cleave peptides in an ATP/ubiquitin-dependent process in a non-lysosomal pathway. An essential function of a modified proteasome, the immunoproteasome, is the processing of class I MHC peptides. This gene encodes a member of the peptidase T1A family, that is a 20S core alpha subunit. Two alternative transcripts encoding different isoforms have been identified.
macropain subunit C8
, multicatalytic endopeptidase complex subunit C8
, proteasome component C8
, proteasome subunit C8
, proteasome subunit alpha type-3
, multicatalytic proteinase subunit K
, proteasome subunit K
, proteasome (prosome, macropain) subunit, alpha type, 3
, molybdenum cofactor sulfurase
, proteasome alpha 3 subunit