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.
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Protein Aliases: Macropain subunit C8; Multicatalytic endopeptidase complex subunit C8; multicatalytic proteinase subunit K; proteasome (prosome, macropain) subunit, alpha type, 3; Proteasome component C8; Proteasome subunit alpha type-3; proteasome subunit C8; Proteasome subunit K; PSA3; testicular secretory protein Li 43
Gene Aliases: HC8; Lmpc8; PSC3; PSC8; PSMA3; Psma3l
Molecular Function: protease