Oxidation of catalytic cysteine of human deubiquitinase BAP1 triggers misfolding and aggregation in addition to functional loss.
Biochem Biophys Res Commun
; 599: 57-62, 2022 04 09.
Article
in En
| MEDLINE
| ID: mdl-35176625
ABSTRACT
Deubiquitinating enzymes (DUBs) form a large protease family involved in a myriad of biological and pathological processes, including ROS sensors. ROS-mediated inhibition of their DUB activities is critical for fine-tuning the stress-activated signaling pathways. Here, we demonstrate that the ubiquitin C-terminal hydrolase (UCH) domain of BAP1 (BAP1-UCH) is highly sensitive to moderate oxidative stress. Oxidation of the catalytic C91 significantly destabilizes BAP1-UCH and increases the population of partially unfolded form, which is prone to aggregation. Unlike other DUBs, the oxidation-induced structural and functional loss of BAP1-UCH cannot be fully reversed by reducing agents. The oligomerization of oxidized BAP1-UCH is attributed to inter-molecular disulfide bond formation. Hydrogen-deuterium mass exchange spectrometry (HDX-MS) reveals increased fluctuations of the central ß-sheet upon oxidation. Our findings suggest that oxidation-mediated functional loss and increased aggregation propensity may contribute to oncogenesis associated with BAP1.
Key words
Full text:
1
Database:
MEDLINE
Main subject:
Cysteine
/
Tumor Suppressor Proteins
/
Ubiquitin Thiolesterase
Limits:
Humans
Language:
En
Journal:
Biochem Biophys Res Commun
Year:
2022
Type:
Article
Affiliation country:
Taiwan