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Dylan M. Silver, Leslie P. Silva, Emmanuelle Issakidis-Bourguet, Mikkel A. Glaring, David C. Schriemer and Greg B. G. Moorhead Insight into the redox regulation of the phosphoglucan phosphatase SEX4 involved in starch degradation The FEBS Journal 280

Version of Record online: 21 MAR 2012 | DOI: 10.1111/j.1742-4658.2012.08546.x

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The dual-specificity phosphatase SEX4 is required for reversible glucan phosphorylation during starch degradation in plants. We demonstrate that SEX4 activity is modulated between reduced (active) and oxidized (inactive) states by a disulfide linkage with the catalytic cysteine, like other redox-regulated phosphatases. This represents the first plant phosphatase to undergo reversible oxidation via disulfide bond formation like its mammalian counterparts.

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