Gosset Molecular Classification
Enzyme, Peptidase T1B family, Proteasome subunit
Other Names
LMPX, MB1, X chain, Macropain epsilon chain, Multicatalytic endopeptidase complex epsilon chain, Proteasome chain 6, Proteasome epsilon chain, Proteasome subunit MB1/X/beta–type–5/beta–subunit–X/beta–subunit MBX
Disease Roles
26S Proteasome Subunit Beta Type-5 Overview
The 26S proteasome subunit beta type-5 (PSMB5) is a crucial component of the 20S core particle of the proteasome, exhibiting chymotrypsin-like activity. It participates in ATP-dependent degradation of ubiquitinated proteins, maintaining protein homeostasis. It is also involved in ubiquitin-independent degradation, particularly in processes like antigen processing. Dysfunctional PSMB5 can contribute to various diseases, making it a therapeutic target, especially in oncology. Proteasome inhibitors that target PSMB5 are clinically used.
Mechanism of Action
Inhibition of chymotrypsin-like activity within the proteasome
Biological Functions
Protein quality control
Cell cycle regulation
Cell growth and differentiation
Gene transcription regulation
Signal transduction pathways
Apoptosis
Protein degradation
Disease Associations
Neurodegenerative disease
Cardiovascular disease
Inflammatory condition
Autoimmune disease
Cancer
Safety Considerations
No safety concerns listed
Interacting Drugs
Protease inhibitors (e.g., for multiple myeloma treatment)