Tbio PSME3 Proteasome activator complex subunit 3

Protein Summary

Description

Subunit of the 11S REG-gamma (also called PA28-gamma) proteasome regulator, a doughnut-shaped homoheptamer which associates with the proteasome. 11S REG-gamma activates the trypsin-like catalytic subunit of the proteasome but inhibits the chymotrypsin-like and postglutamyl-preferring (PGPH) subunits. Facilitates the MDM2-p53/TP53 interaction which promotes ubiquitination- and MDM2-dependent proteasomal degradation of p53/TP53, limiting its accumulation and resulting in inhibited apoptosis after DNA damage. May also be involved in cell cycle regulation. Mediates CCAR2 and CHEK2-dependent SIRT1 inhibition (PubMed:25361978). 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. The immunoproteasome contains an alternate regulator, referred to as the 11S regulator or PA28, that replaces the 19S regulator. Three subunits (alpha, beta and gamma) of the 11S regulator have been identified. This gene encodes the gamma subunit of the 11S regulator. Six gamma subunits combine to form a homohexameric ring. Alternate splicing results in multiple transcript variants. [provided by RefSeq, May 2012]

Uniprot Accession IDs

• P61289
• A8K9A3
• O35563
• P97373
• Q12920
• Q13172
• Q9BQD9

Gene Name

• PSME3

Ensembl ID

• ENST00000293362
• ENSP00000293362
• ENSG00000131467
• ENST00000441946
• ENSP00000409487
• ENST00000590720
• ENSP00000466794

Symbol

• Ki
• PA28G
• HEL-S-283
• PA28gamma
• REG-GAMMA
• PA28-gamma

Knowledge Table

Most Knowledge About	Knowledge Value (0 to 1 scale)
disease perturbation	1
kinase perturbation	1
biological process	0.99
interacting protein	0.98
virus	0.89

Protein Classes

No PANTHER Classes or DTO Classes found

IDG Development Level Summary

Tdark

These are targets about which virtually nothing is known. They do not have known drug or small molecule activities
- AND - satisfy two or more of the following criteria:

Pubmed score: 140.06   (req: < 5)

Gene RIFs: 71   (req: <= 3)

Antibodies: 309   (req: <= 50)

Tbio

These targets do not have known drug or small molecule activities
- AND - satisfy two or more of the following criteria:

Pubmed score: 140.06   (req: >= 5)

Gene RIFs: 71   (req: > 3)

Antibodies: 309   (req: > 50)

- OR - satisfy the following criterion:

Gene Ontology Terms: 12

Tchem

Target has at least one ChEMBL compound with an activity cutoff of < 30 nM - AND - satisfies the preceding conditions

Active Ligand: 0

Tclin

Target has at least one approved drug - AND - satisfies the preceding conditions

Active Drug: 0