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DJ-1 is known to play neuroprotective roles by eliminating reactive oxygen species (ROS) as an antioxidant protein. However, the molecular mechanism of DJ-1 function has not been well elucidated. This study explored the structural and functional changes of DJ-1 in response to oxidative stress. We found that Cys46 is also reactive cysteine residue in DJ-1, which was identified employing an NPSB-B chemical probe that selectively reacts with redox sensitive cysteine sulfhydryl. Peroxidatic Cys46doi:10.1101/2021.01.25.428026 fatcat:2sb6xplcordsvlq46tojop6tdu