Description: Homo sapiens proteasome (prosome, macropain) subunit, beta type, 1 (PSMB1), mRNA. RefSeq Summary (NM_002793): 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 proteasome B-type family, also known as the T1B family, that is a 20S core beta subunit. This gene is tightly linked to the TBP (TATA-binding protein) gene in human and in mouse, and is transcribed in the opposite orientation in both species. [provided by RefSeq, Jul 2008]. Transcript (Including UTRs) Position: hg19 chr6:170,844,204-170,862,417 Size: 18,214 Total Exon Count: 6 Strand: - Coding Region Position: hg19 chr6:170,844,308-170,862,330 Size: 18,023 Coding Exon Count: 6
ID:PSB1_HUMAN DESCRIPTION: RecName: Full=Proteasome subunit beta type-1; EC=3.4.25.1; AltName: Full=Macropain subunit C5; AltName: Full=Multicatalytic endopeptidase complex subunit C5; AltName: Full=Proteasome component C5; AltName: Full=Proteasome gamma chain; Flags: Precursor; FUNCTION: 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. CATALYTIC ACTIVITY: Cleavage of peptide bonds with very broad specificity. SUBUNIT: The 26S proteasome consists of a 20S proteasome core and two 19S regulatory subunits. The 20S proteasome core is composed of 28 subunits that are arranged in four stacked rings, resulting in a barrel-shaped structure. The two end rings are each formed by seven alpha subunits, and the two central rings are each formed by seven beta subunits. The catalytic chamber with the active sites is on the inside of the barrel. Interacts with SERPINB2. Interacts with HIV-1 TAT protein. INTERACTION: Q99436:PSMB7; NbExp=6; IntAct=EBI-372273, EBI-603319; SUBCELLULAR LOCATION: Cytoplasm. Nucleus. SIMILARITY: Belongs to the peptidase T1B family.
The RNAfold program from the Vienna RNA Package is used to perform the secondary structure predictions and folding calculations. The estimated folding energy is in kcal/mol. The more negative the energy, the more secondary structure the RNA is likely to have.
ModBase Predicted Comparative 3D Structure on P20618
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Orthologous Genes in Other Species
Orthologies between human, mouse, and rat are computed by taking the best BLASTP hit, and filtering out non-syntenic hits. For more distant species reciprocal-best BLASTP hits are used. Note that the absence of an ortholog in the table below may reflect incomplete annotations in the other species rather than a true absence of the orthologous gene.
Biological Process: GO:0006508 proteolysis GO:0016032 viral process GO:0016579 protein deubiquitination GO:0043312 neutrophil degranulation GO:0043687 post-translational protein modification GO:0051603 proteolysis involved in cellular protein catabolic process
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