Proteasome (prosome, macropain) inhibitor subunit 1 (PI31), also known as PSMF1, is a human gene.cite web | title = Entrez Gene: PSMF1 proteasome (prosome, macropain) inhibitor subunit 1 (PI31)| url =| accessdate = ]

section_title =
summary_text = The 26S proteasome is a multicatalytic proteinase complex with a highly ordered structure composed of 2 complexes, a 20S core and a 19S regulator. The 20S core 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. The 19S regulator is composed of a base, which contains 6 ATPase subunits and 2 non-ATPase subunits, and a lid, which contains up to 10 non-ATPase 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 protein that inhibits the activation of the proteasome by the 11S and 19S regulators. Alternative transcript variants have been identified for this gene.cite web | title = Entrez Gene: PSMF1 proteasome (prosome, macropain) inhibitor subunit 1 (PI31)| url =| accessdate = ]


Further reading

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