| Background: | 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 one of the ATPase subunits, a member of the triple-A family of ATPases which have a chaperone-like activity. This subunit and a 20S core alpha subunit interact specifically with the hepatitis B virus X protein, a protein critical to viral replication. This subunit also interacts with the adenovirus E1A protein and this interaction alters the activity of the proteasome. Finally, this subunit interacts with ataxin-7, suggesting a role for the proteasome in the development of spinocerebellar ataxia type 7, a progressive neurodegenerative disorder. |
| UniProt Protein Function: | RPT2: The 26S protease is involved in the ATP-dependent degradation of ubiquitinated proteins. The regulatory (or ATPase) complex confers ATP dependency and substrate specificity to the 26S complex. Belongs to the AAA ATPase family. |
| UniProt Protein Details: | Protein type:Protease; Proteasome complex Chromosomal Location of Human Ortholog: 14q32.11 Cellular Component: cytoplasm; cytosol; membrane; nucleoplasm; nucleus; proteasome complex Molecular Function:ATP binding; ATPase activity; protein binding; TATA-binding protein binding Biological Process: activation of MAPKK activity; anaphase-promoting complex-dependent proteasomal ubiquitin-dependent protein catabolic process; antigen processing and presentation of exogenous peptide antigen via MHC class I; antigen processing and presentation of exogenous peptide antigen via MHC class I, TAP-dependent; antigen processing and presentation of peptide antigen via MHC class I; apoptosis; axon guidance; DNA damage response, signal transduction by p53 class mediator resulting in cell cycle arrest; epidermal growth factor receptor signaling pathway; ER-associated protein catabolic process; fibroblast growth factor receptor signaling pathway; G1/S transition of mitotic cell cycle; gene expression; innate immune response; insulin receptor signaling pathway; MAPKKK cascade; mitotic cell cycle; negative regulation of apoptosis; negative regulation of ubiquitin-protein ligase activity during mitotic cell cycle; nerve growth factor receptor signaling pathway; polyamine metabolic process; positive regulation of transcriptional preinitiation complex assembly; positive regulation of ubiquitin-protein ligase activity during mitotic cell cycle; programmed cell death; protein polyubiquitination; Ras protein signal transduction; regulation of amino acid metabolic process; regulation of apoptosis; regulation of mRNA stability; regulation of ubiquitin-protein ligase activity during mitotic cell cycle; small GTPase mediated signal transduction; stimulatory C-type lectin receptor signaling pathway; T cell receptor signaling pathway; tumor necrosis factor-mediated signaling pathway; vascular endothelial growth factor receptor signaling pathway; viral reproduction |
| NCBI Summary: | 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 one of the ATPase subunits, a member of the triple-A family of ATPases which have a chaperone-like activity. This subunit and a 20S core alpha subunit interact specifically with the hepatitis B virus X protein, a protein critical to viral replication. This subunit also interacts with the adenovirus E1A protein and this interaction alters the activity of the proteasome. Finally, this subunit interacts with ataxin-7, suggesting a role for the proteasome in the development of spinocerebellar ataxia type 7, a progressive neurodegenerative disorder. [provided by RefSeq, Jul 2008] |
| UniProt Code: | P62191 |
| NCBI GenInfo Identifier: | 49065817 |
| NCBI Gene ID: | 5700 |
| NCBI Accession: | P62191.1 |
| UniProt Secondary Accession: | P62191,P62193, P62192, |
| UniProt Related Accession: | P62191 |
| Molecular Weight: | 49185 |
| NCBI Full Name: | 26S proteasome regulatory subunit 4 |
| NCBI Synonym Full Names: | proteasome 26S subunit, ATPase 1 |
| NCBI Official Symbol: | PSMC1 |
| NCBI Official Synonym Symbols: | S4; p56; P26S4 |
| NCBI Protein Information: | 26S proteasome regulatory subunit 4 |
| UniProt Protein Name: | 26S protease regulatory subunit 4 |
| UniProt Synonym Protein Names: | 26S proteasome AAA-ATPase subunit RPT2; Proteasome 26S subunit ATPase 1 |
| Protein Family: | Ribose-phosphate pyrophosphokinase |
| UniProt Gene Name: | PSMC1 |
| UniProt Entry Name: | PRS4_HUMAN |
