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Title: Proteome-wide Light/Dark Modulation of Thiol Oxidation in Cyanobacteria Revealed by Quantitative Site-Specific Redox Proteomics

Journal Article · · Molecular & Cellular Proteomics. MCP

Reversible protein thiol oxidation is an essential regulatory mechanism of photosynthesis, metabolism, and gene expression in photosynthetic organisms. Herein, we present the first proteome-wide quantitative site-specific profiling of in vivo dynamics of thiol oxidation modulated by light/dark in cyanobacterium Synechocystis sp. PCC 6803, an oxygenic photosynthetic prokaryote. Our proteomic approach integrates resin-assisted enrichment with isobaric labeling to enable site-specific and quantitative measurements of reversibly oxidized thiols. The redox dynamics of ~2,200 cysteine sites from 1,060 proteins under different conditions (light, dark, and in the presence of a photosystem II inhibitor DCMU) were quantified. The results revealed broad proteome-wide changes in thiol oxidation in many key biological processes including photosynthesis, carbon fixation, and glycolysis. Moreover, the redox sensitivity data provides a good prediction of potential functional cysteine sites for proteins of interest. Together, our findings provided significant novel insights into the broad redox regulation of photosynthetic organisms.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1640887
Report Number(s):
PNNL-SA-100244
Journal Information:
Molecular & Cellular Proteomics. MCP, Vol. 13, Issue 12
Country of Publication:
United States
Language:
English

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