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Authors: Schildknecht, Stefan
Kriegsheim, Alex von
Vujacic-Mirski, Ksenija
Di Lisa, Fabio
Ullrich, Volker
Daiber, Andreas
Title: Recovery of reduced thiol groups by superoxide-mediated denitrosation of nitrosothiols
Online publication date: 25-Jan-2023
Year of first publication: 2022
Language: english
Abstract: Nitrosation of critical thiols has been elaborated as reversible posttranslational modification with regulatory function in multiple disorders. Reversibility of S-nitrosation is generally associated with enzyme-mediated one-electron reductions, catalyzed by the thioredoxin system, or by nitrosoglutathione reductase. In the present study, we confirm previous evidence for a non-enzymatic de-nitrosation of nitrosoglutathione (GSNO) by superoxide. The interaction leads to the release of nitric oxide that subsequently interacts with a second molecule of superoxide (O2•−) to form peroxynitrite. Despite the formation of peroxynitrite, approximately 40–70% of GSNO yielded reduced glutathione (GSH), depending on the applied analytical assay. The concept of O2•− dependent denitrosation was then applied to S-nitrosated enzymes. S-nitrosation of isocitrate dehydrogenase (ICDH; NADP+-dependent) was accompanied by an inhibition of the enzyme and could be reversed by dithiothreitol. Treatment of nitrosated ICDH with O2•− indicated ca. 50% recovery of enzyme activity. Remaining inhibition was largely consequence of oxidative modifications evoked either by O2•− or by peroxynitrite. Recovery of activity in S-nitrosated enzymes by O2•− appears relevant only for selected examples. In contrast, recovery of reduced glutathione from the interaction of GSNO with O2•− could represent a mechanism to regain reducing equivalents in situations of excess O2•− formation, e.g. in the reperfusion phase after ischemia.
DDC: 610 Medizin
610 Medical sciences
Institution: Johannes Gutenberg-Universität Mainz
Department: FB 04 Medizin
Place: Mainz
Version: Published version
Publication type: Zeitschriftenaufsatz
Document type specification: Scientific article
License: CC BY-NC-ND
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Journal: Redox Biology
Pages or article number: 102439
Publisher: Elsevier
Publisher place: Amsterdam
Issue date: 2022
ISSN: 2213-2317
Publisher DOI: 10.1016/j.redox.2022.102439
Appears in collections:DFG-491381577-G

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