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Proteome-Wide Survey Reveals Norbornene Is Complementary to Dimedone and Related Nucleophilic Probes for Cysteine Sulfenic Acid

preprint
submitted on 16.07.2019 and posted on 16.07.2019 by Lisa Alcock, Maike Langini, Kai Stühler, Marc Remke, Michael Perkins, Gonçalo Bernardes, Justin Chalker

Detection of cysteine sulfenic acid in live cells is critical in advancing our understanding of cysteine redox chemistry and its biological function. Accordingly, there is a need to develop sulfenic acid-specific chemical probes with distinct reaction mechanisms to facilitate proteome-wide detection of this important posttranslational modification. Herein, we report the first whole-cell proteomics analysis using a norbornene probe to detect cysteine sulfenic acid in live HeLa cells. Comparison of the enriched proteins to those identified using dimedone and other C-nucleophilic probes revealed a complementary reactivity profile. Remarkably, 148 new members of the sulfenome were identified. These discoveries highlight how subtle differences in chemical reactivity of both the probes and cysteine residues influence detection. Overall, this study expands our understanding of protein oxidation at cysteine and reveals new proteins to consider for future studies of cysteine oxidation, redox regulation and signaling, and the biochemistry of oxidative stress.

Funding

Australian Research Council (DE150101863)

The Royal Society (URF\R\180019)

FCT Portugal (iFCT, IF/00624/2015)

The Australian Government Endeavour Postgraduate Scholarship

History

Email Address of Submitting Author

justin.chalker@flinders.edu.au

Institution

Flinders University

Country

Australia

ORCID For Submitting Author

0000-0002-7504-5508

Declaration of Conflict of Interest

The authors declare no conflict of interest.

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