Proteasome 20S subunit beta 1 (PSMB1)

Proteasome 20S subunit beta 1 (PSMB1) is a non-catalytic structural subunit of the 20S core proteasome, an essential multicatalytic protease complex responsible for the ATP/ubiquitin-dependent degradation of most intracellular proteins in eukaryotic cells. PSMB1, together with other beta subunits, forms part of the proteolytic chamber necessary for regulated protein degradation, playing vital roles in processes including cell cycle control, apoptosis, transcription, immune responses, and degradation of damaged or misfolded proteins. Together, these processes are fundamental to cellular protein homeostasis and regulation. Dysfunction or dysregulation of the proteasome (including PSMB1) is implicated in the pathogenesis of cancer, neurodegeneration, cardiovascular disease, inflammation, and autoimmune disorders. PSMB1, as a notable proteasome subunit, is considered a therapeutic target as part of the proteasome complex, targeted by several approved proteasome inhibitors in oncology and experimental therapeutics.

Other names

Proteasome subunit beta type-1Proteasome subunit beta-1Proteasome subunit beta-6Proteasome component C5Proteasome gamma chainHC5PSC5PMSB1NEDMHALMacropain subunit C5Multicatalytic endopeptidase complex subunit C5Proteasome (prosome, macropain) subunit, beta type, 1testicular secretory protein Li 45

Inhibition of proteasome-mediated proteolysis prevents degradation of key regulatory proteins, leading to cell cycle arrest, apoptosis, and anti-tumor effects (as with bortezomib and related drugs)