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 a non-ATPase subunit of the 19S regulator. A pseudogene has been identified on chromosome 3. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. |
UniProt Protein Function: | PSMD12: Acts as a regulatory subunit of the 26S proteasome which is involved in the ATP-dependent degradation of ubiquitinated proteins. Belongs to the proteasome subunit p55 family. 2 isoforms of the human protein are produced by alternative splicing. |
UniProt Protein Details: | Protein type:Protease; Proteasome complex Chromosomal Location of Human Ortholog: 17q24.2 Cellular Component: proteasome complex; nucleoplasm; membrane; proteasome regulatory particle; cytosol Biological Process: positive regulation of ubiquitin-protein ligase activity during mitotic cell cycle; negative regulation of ubiquitin-protein ligase activity during mitotic cell cycle; protein polyubiquitination; viral reproduction; apoptosis; antigen processing and presentation of exogenous peptide antigen via MHC class I, TAP-dependent; DNA damage response, signal transduction by p53 class mediator resulting in cell cycle arrest; regulation of apoptosis; antigen processing and presentation of peptide antigen via MHC class I; regulation of ubiquitin-protein ligase activity during mitotic cell cycle; anaphase-promoting complex-dependent proteasomal ubiquitin-dependent protein catabolic process; antigen processing and presentation of exogenous peptide antigen via MHC class I; gene expression; mitotic cell cycle; regulation of amino acid metabolic process; G1/S transition of mitotic cell cycle; negative regulation of apoptosis |
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 a non-ATPase subunit of the 19S regulator. A pseudogene has been identified on chromosome 3. [provided by RefSeq, Jul 2008] |
UniProt Code: | O00232 |
NCBI GenInfo Identifier: | 20978544 |
NCBI Gene ID: | 5718 |
NCBI Accession: | O00232.3 |
UniProt Secondary Accession: | O00232,Q53HA2, Q6P053, A6NP15, |
UniProt Related Accession: | O00232 |
Molecular Weight: | 50,579 Da |
NCBI Full Name: | 26S proteasome non-ATPase regulatory subunit 12 |
NCBI Synonym Full Names: | proteasome (prosome, macropain) 26S subunit, non-ATPase, 12 |
NCBI Official Symbol: | PSMD12 |
NCBI Official Synonym Symbols: | p55; Rpn5 |
NCBI Protein Information: | 26S proteasome non-ATPase regulatory subunit 12; 26S proteasome regulatory subunit p55; 26S proteasome regulatory subunit RPN5 |
UniProt Protein Name: | 26S proteasome non-ATPase regulatory subunit 12 |
UniProt Synonym Protein Names: | 26S proteasome regulatory subunit RPN5; 26S proteasome regulatory subunit p55 |
Protein Family: | 26S proteasome non-ATPase regulatory |
UniProt Gene Name: | PSMD12 |
UniProt Entry Name: | PSD12_HUMAN |