YajL, Prokaryotic Homolog of Parkinsonism-associated Protein DJ-1, Functions as a Covalent Chaperone for Thiol Proteome SCIE SCOPUS

Cited 32 time in WEB OF SCIENCE Cited 32 time in Scopus
Title
YajL, Prokaryotic Homolog of Parkinsonism-associated Protein DJ-1, Functions as a Covalent Chaperone for Thiol Proteome
Author(s)
Hai-Tuong Le; Gautier, Valerie; Kthiri, Fatoum; Malki, Abderrahim; Messaoudi, Nadia; Mihoub, Mouadh; Landoulsi, Ahmed; An, Young Jun; Cha, Sun-Shin; Richarme, Gilbert
KIOST Author(s)
An, Young Jun(안영준)
Alternative Author(s)
안영준; 차선신
Publication Year
2012-02
Abstract
YajL is the closest Escherichia coli homolog of the Parkinsonism-associated protein DJ-1, a multifunctional oxidative stress response protein whose biochemical function remains unclear. We recently reported the aggregation of proteins in a yajL mutant in an oxidative stress-dependent manner and that YajL exhibits chaperone activity. Here, we show that YajL displays covalent chaperone and weak protein oxidoreductase activities that are dependent on its exposed cysteine 106. It catalyzes reduced RNase oxidation and scrambled RNase isomerization and insulin reduction and forms mixed disulfides with many cellular proteins upon oxidative stress. The formation of mixed disulfides was detected by immunoblotting bacterial extracts with anti-YajL antibodies under nonreducing conditions. Disulfides were purified from bacterial extracts on a YajL affinity column, separated by nonreducing-reducing SDS-PAGE, and identified by mass spectrometry. Covalent YajL substrates included ribosomal proteins, aminoacyl-tRNA synthetases, chaperones, catalases, peroxidases, and other proteins containing cysteines essential for catalysis or FeS cluster binding, such as glyceraldehyde-3-phosphate dehydrogenase, aldehyde dehydrogenase, aconitase, and FeS cluster-containing subunits of respiratory chains. In addition, we show that DJ-1 also forms mixed disulfides with cytoplasmic proteins upon oxidative stress. These results shed light on the oxidative stress-dependent chaperone function of YajL and identify YajL substrates involved in translation, stress protection, protein solubilization, and metabolism. They reveal a crucial role for cysteine 106 and suggest that DJ-1 also functions as a covalent chaperone. These findings are consistent with several defects observed in yajL or DJ-1 mutants, including translational defects, protein aggregation, oxidative stress sensitivity, and metabolic deficiencies.
ISSN
0021-9258
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/3627
DOI
10.1074/jbc.M111.299198
Bibliographic Citation
JOURNAL OF BIOLOGICAL CHEMISTRY, v.287, no.8, pp.5861 - 5870, 2012
Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
Type
Article
Language
English
Document Type
Article
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