Target intelligence / Profile preview

Proteasome inhibitor PI31 subunit (PSMF1)

Target
PSMF1
Molecular classification
Other, Proteasome regulator, Endopeptidase inhibitor
01

Overview

The **Proteasome inhibitor PI31 subunit (PSMF1)** is a regulatory protein that inhibits the activation and proteolytic activity of the 20S proteasome by interacting with its regulatory complexes, PA700 (19S) and PA28 (11S). PSMF1 thereby modulates protein turnover in the cell, particularly in pathways reliant on ubiquitin-mediated degradation. Its function is crucial for maintaining the balance between protein synthesis and degradation, and alterations in PSMF1 have been associated with neurodegenerative disorders such as early-onset Parkinson's disease[1][3][5].

Other names
PI31hPI31proteasome inhibitor subunit 1PSMF1PI-31proteasome (prosome, macropain) inhibitor subunit 1proteasome inhibitor hP131 subunit
02

Mechanism of action

Inhibition of proteasome-mediated protein hydrolysis; blocks activation of proteasome by regulatory complexes

03

Biological functions

Regulation of proteasome activityEndopeptidase inhibitionProtein degradation controlInhibition of proteasome activation by regulatory particles (PA700/19S and PA28/11S)
04

Disease associations

Neurodegenerative disease (e.g., Parkinson disease 15, autosomal recessive early-onset)Potential relevance in diseases involving ubiquitin-proteasome system and protein homeostasis
05

Safety considerations

Targeting or inhibiting proteasome regulators could impair essential protein degradation and cellular homeostasis, with risks of unintended cell death or dysfunction

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