S-glutathionylation regulates GTP-binding of Rac2 |
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Authors: | In Sup Kil Seoung Woo Shin Jeen-Woo Park |
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Affiliation: | School of Life Sciences and Biotechnology, College of Natural Sciences, Kyungpook National University, Taegu 702701, Republic of Korea. |
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Abstract: | 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. |
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