PSME2 (proteasome activator subunit 2)

Gene

• Entrez ID: 5721
• Gene name: Proteasome activator subunit 2
• Gene symbol: PSME2
• Synonyms (NCBI Gene): PA28B, PA28beta, REGbeta
• Chromosome: 14
• Chromosome location: 14q12
• 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 a

Gene ontology (GO)

GO ID	Ontology	Definition	Evidence	Reference
GO:0000502	Component	Proteasome complex	IEA
GO:0000502	Component	Proteasome complex	TAS	8811196
GO:0005515	Function	Protein binding	IPI	16189514, 32296183, 33961781, 35271311
GO:0005654	Component	Nucleoplasm	IBA
GO:0005654	Component	Nucleoplasm	TAS
GO:0005737	Component	Cytoplasm	IBA
GO:0005829	Component	Cytosol	TAS
GO:0008537	Component	Proteasome activator complex	IEA
GO:0016020	Component	Membrane	HDA	19946888
GO:0042802	Function	Identical protein binding	IPI	16189514, 32296183
GO:0061133	Function	Endopeptidase activator activity	IBA
GO:0061136	Process	Regulation of proteasomal protein catabolic process	IBA
GO:0070062	Component	Extracellular exosome	HDA	19056867, 23533145
GO:2000045	Process	Regulation of G1/S transition of mitotic cell cycle	IBA

Other IDs

• MIM: 602161
• HGNC: 9569
• e!Ensembl: ENSG00000100911

Protein

• UniProt ID: Q9UL46
• Protein name: Proteasome activator complex subunit 2 (11S regulator complex subunit beta) (REG-beta) (Activator of multicatalytic protease subunit 2) (Proteasome activator 28 subunit beta) (PA28b) (PA28beta)
• Protein function: Implicated in immunoproteasome assembly and required for efficient antigen processing. The PA28 activator complex enhances the generation of class I binding peptides by altering the cleavage pattern of the proteasome.
• PDB: 7DR6, 7DRW, 7NAO, 7NAP, 8CXB
• Family and domains:

  Pfam

  Accession	ID	Position in sequence	Description	Type
  PF02251	PA28_alpha	11 → 71	Proteasome activator pa28 alpha subunit	Family
  PF02252	PA28_beta	93 → 237	Proteasome activator pa28 beta subunit	Family

• Sequence:

  MAKPCGVRLSGEARKQVEVFRQNLFQEAEEFLYRFLPQKIIYLNQLLQEDSLNVADLTSL
  RAPLDIPIPDPPPKDDEMETDKQEKKEVHKCGFLPGNEKVLSLLALVKPEVWTLKEKCIL
  VITWIQHLIPKIEDGNDFGVAIQEKVLERVNAVKTKVEAFQTTISKYFSERGDAVAKASK
  ETHVMDYRALVHERDEAAYGELRAMVLDLRAFYAELYHIISSNLEKIVNPKGEEKPSMY

• Sequence length: 239