Abstract
Cysteine is widely involved in redox signaling pathways through a number of reversible and irreversible modifications. Reversible modifications (e.g., S-glutathionylation, S-nitrosylation, disulfide bonds, and sulfenic acid) are used to protect proteins from oxidative attack and maintain cellular homeostasis, while irreversible oxidations (e.g., sulfinic acid and sulfonic acid) serve as hallmarks of oxidative stress. Proteomic analysis of cysteine-enriched peptides coupled with reduction of oxidized thiols can be used to measure the oxidation states of cysteine, which is helpful for elucidating the role that oxidative stress plays in biology and disease. As an extension of our previously reported cysDML method, we have developed oxidized cysteine-selective dimethylation (OxcysDML), to investigate the site-specific total oxidation of cysteine residues in biologically relevant samples. OxcysDML employs (1) blocking of free thiols by a cysteine-reactive reagent, (2) enrichment of peptides containing reversibly oxidized cysteine by a solid phase resin, and (3) isotopic labeling of peptide amino groups to quantify cysteine modifications arising from different biological conditions. On-resin enrichment and labeling minimizes sample handing time and improves efficiency in comparison with other redox proteomic methods. OxcysDML is also inexpensive and flexible, as it can accommodate the exploration of various cysteine modifications. Here, we applied the method to liver tissues from a late-stage Alzheimer’s disease (AD) mouse model and wild-type (WT) controls. Because we have previously characterized this proteome using the cysDML approach, we are able here to probe deeper into the redox status of cysteine in AD. OxcysDML identified 1129 cysteine sites (from 527 proteins), among which 828 cysteine sites underwent oxidative modifications. Nineteen oxidized cysteine sites had significant alteration levels in AD and represent proteins involved in metabolic processes. Overall, we have demonstrated OxcysDML as a simple, rapid, robust, and inexpensive redox proteomic approach that is useful for gaining deeper insight into the proteome of AD.
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Acknowledgments
This research was supported by the University of Pittsburgh Start-up Funds. The authors acknowledge Xi Wang for assistance with statistical testing.
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Animal protocols were approved by the Institutional Animal Care and Use Committee at the University of Pittsburgh.
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Published in the topical collection featuring Young Investigators in Analytical and Bioanalytical Science with guest editors S. Daunert, A. Baeumner, S. Deo, J. Ruiz Encinar, and L. Zhang.
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Gu, L., Robinson, R.A.S. A simple isotopic labeling method to study cysteine oxidation in Alzheimer’s disease: oxidized cysteine-selective dimethylation (OxcysDML). Anal Bioanal Chem 408, 2993–3004 (2016). https://doi.org/10.1007/s00216-016-9307-4
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DOI: https://doi.org/10.1007/s00216-016-9307-4