S-glutathionylation regulates GTP-binding of Rac2.

Phagocyte NADPH oxidase catalyzes the reduction of molecular oxygen to superoxide and is essential for defense against microbes. Rac2 is a low molecular weight GTP-binding protein that has been implicated in the regulation of phagocyte NADPH oxidase. Here we report that Cys(157) of Rac2 is a target of S-glutathionylation and that this modification is reversed by dithiothreitol as well as enzymatically by thioltransferase in the presence of GSH. S-glutathionylated Rac2 enhanced the binding of GTP, presumably due to structural alterations. These results elucidate the redox regulation of cysteine in Rac2 and a possible mechanism for regulating NADPH oxidase activation. Copyright © 2012 Elsevier Inc. All rights reserved.

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In Sup Kil, Seoung Woo Shin, Jeen-Woo Park. S-glutathionylation regulates GTP-binding of Rac2. Biochemical and biophysical research communications. 2012 Sep 07;425(4):892-6

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PMID: 22902632

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