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. [provided by RefSeq, Jul 2008]
Function:
Plays an important role in control of proteasome function. Inhibits the hydrolysis of protein and peptide substrates by the 20S proteasome. Also inhibits the activation of the proteasome by the proteasome regulatory proteins PA700 and PA28.
Similarity:
Belongs to the proteasome inhibitor PI31 family.
SWISS:
Q92530
Gene ID:
9491
Database links:
Entrez Gene: 9491 Human
Entrez Gene: 228769 Mouse
Entrez Gene: 689852 Rat
SwissProt: Q92530 Human
SwissProt: Q8SHL8 Mouse
SwissProt: Q5XIU5 Rat
Unigene: 471917 Human
Unigene: 146984 Mouse
Unigene: 103325 Rat
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