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Official Full Name: proteasome 26S subunit ubiquitin receptor, non-ATPase 4<br />Also known as: AF; ASF; S5A; AF-1; MCB1; Rpn10; pUB-R5<br />The 26S proteasome is a multicatalytic protease complex with a highly ordered structure consisting of 2 complexes, a 20S core and a 19S regulator. The 20S core consists of 4 rings composed of 28 different subunits; 2 rings composed of 7 α subunits, and 2 rings composed of 7 β subunits. The 19S regulator consists of a base (containing 6 ATPase subunits and 2 non-ATPase subunits) and a lid (containing up to 10 non-ATPase subunits). The proteasome is distributed in high concentrations in eukaryotic cells and cleaves peptides in a non-lysosomal pathway in an ATP/ubiquitin-dependent process. A modified proteasome, the essential function of the immunoproteasome is to process MHC class I peptides. This gene encodes a non-ATPase subunit of the 19S regulatory lid. Pseudogenes were identified on chromosomes 10 and 21.