Proteasome Subunit Alpha Type-1 (PSMA1) Human Recombinant Protein

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. Alternative splicing results in multiple transcript variants encoding distinct isoforms.[provided by RefSeq, Jan 2009]

PSMA1: The proteasome is a multicatalytic proteinase complex which is characterized by its ability to cleave peptides with Arg, Phe, Tyr, Leu, and Glu adjacent to the leaving group at neutral or slightly basic pH. The proteasome has an ATP-dependent proteolytic activity. Mediates the lipopolysaccharide-induced signal transduction in the macrophage proteasome. Might be involved in the anti-inflammatory response of macrophages during the interaction with C.albicans heat-inactivated cells. Belongs to the peptidase T1A family. 2 isoforms of the human protein are produced by alternative splicing.

Protein type: EC 3.4.25.1; Proteasome complex; Protease

Chromosomal Location of Human Ortholog: 11p15.1

Cellular Component: centrosome; cytosol; nucleoplasm; nucleus; polysome; proteasome complex; proteasome core complex

Molecular Function: protein binding; RNA binding; threonine endopeptidase activity

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; 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 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