Proteasome Subunit Beta Type 4 (PSMb4)

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.

PSMB4 encodes a member of the proteasome B-type family, also known as the T1B family, that is a 20S core beta subunit.PSMB4 is mapped to 1q21 by fluorescence in situ hybridization.