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Surface cysteines could protect the SARS-CoV-2 main protease from oxidative damage

Ravanfar, Raheleh and Sheng, Yuling and Shahgholi, Mona and Lomenick, Brett and Jones, Jeff and Chou, Tsui-Fen and Gray, Harry B. and Winkler, Jay R. (2022) Surface cysteines could protect the SARS-CoV-2 main protease from oxidative damage. Journal of Inorganic Biochemistry, 234 . Art. No. 111886. ISSN 0162-0134. PMCID PMC9161685. doi:10.1016/j.jinorgbio.2022.111886.

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The SARS-CoV-2 main protease (Mᵖʳᵒ) is responsible for cleaving twelve nonstructural proteins from the viral polyprotein. Mᵖʳᵒ, a cysteine protease, is characterized by a large number of noncatalytic cysteine (Cys) residues, none involved in disulfide bonds. In the absence of a tertiary-structure stabilizing role for these residues, a possible alternative is that they are involved in redox processes. We report experimental work in support of a proposal that surface cysteines on M^(pro) can protect the active-site Cys145 from oxidation by reactive oxygen species (ROS). In investigations of enzyme kinetics, we found that mutating three surface cysteines to serines did not greatly affect activity, which in turn indicates that these cysteines could protect Cys145 from oxidative damage.

Item Type:Article
Related URLs:
URLURL TypeDescription Data CentralArticle
Ravanfar, Raheleh0000-0003-2992-0575
Shahgholi, Mona0000-0002-8879-4305
Lomenick, Brett0000-0002-5023-9998
Chou, Tsui-Fen0000-0003-2410-2186
Gray, Harry B.0000-0002-7937-7876
Winkler, Jay R.0000-0002-4453-9716
Additional Information:© 2022 Elsevier Inc. Received 2 March 2022, Revised 28 April 2022, Accepted 29 May 2022, Available online 2 June 2022. We thank Dr. Jennifer Keeffe for assistance with SEC-MALS. Experimental work was performed in the Caltech Mass Spectrometry Laboratory in the Division of Chemistry and Chemical Engineering; and the Beckman Institute Laser Resource Center and Proteome Exploration Laboratory supported by the Arnold and Mabel Beckman Foundation. The work was supported by the National Institute of Diabetes and Digestive and Kidney Diseases of the National Institutes of Health under award number R01DK019038. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. CRediT authorship contribution statement: Raheleh Ravanfar: Investigation, Methodology, Writing – original draft, Writing – review & editing. Yuling Sheng: Investigation. Mona Shahgholi: Investigation, Methodology, Writing – review & editing. Brett Lomenick: Investigation, Methodology, Formal analysis, Writing – review & editing. Jeff Jones: Investigation, Methodology, Formal analysis, Writing – review & editing. Tsui-Fen Chou: Writing – review & editing, Methodology. Harry B. Gray: Funding acquisition, Project administration, Writing – review & editing. Jay R. Winkler: Conceptualization, Funding acquisition, Project administration, Writing – review & editing. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Funding AgencyGrant Number
Arnold and Mabel Beckman FoundationUNSPECIFIED
Subject Keywords:SARS-CoV-2 main protease; Reactive oxygen species; Cysteine
PubMed Central ID:PMC9161685
Record Number:CaltechAUTHORS:20220603-698843600
Persistent URL:
Official Citation:Raheleh Ravanfar, Yuling Sheng, Mona Shahgholi, Brett Lomenick, Jeff Jones, Tsui-Fen Chou, Harry B. Gray, Jay R. Winkler, Surface cysteines could protect the SARS-CoV-2 main protease from oxidative damage, Journal of Inorganic Biochemistry, Volume 234, 2022, 111886, ISSN 0162-0134,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115017
Deposited By: Tony Diaz
Deposited On:03 Jun 2022 19:56
Last Modified:30 Jun 2022 17:10

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