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. A pseudogene has been identified on the Y chromosome.
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Protein Aliases: 27 kDa prosomal protein; Macropain iota chain; macropain subunit iota; MGC22756; MGC2333; MGC23846; Multicatalytic endopeptidase complex iota chain; PROS 27; PROS-27; prosomal P27K protein; proteasome (prosome, macropain) subunit, alpha type, 6; proteasome alpha 6 subunit; Proteasome iota chain; Proteasome subunit alpha type-6; proteasome subunit iota; PSA6; PSMA 6; testicular secretory protein Li 44
Gene Aliases: IOTA; p27K; PROS27; PSMA6
Molecular Function: protease