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• W2147968009 abstract "The reversible oxidation of the active site cysteine in typical 2-Cys peroxiredoxins (Prx) to sulfinic acid during oxidative stress plays an important role in peroxide-mediated cell signaling. The catalytic retroreduction of Prx-SO(2)(-) by sulfiredoxin (Srx) has been proposed to proceed through two novel reaction intermediates, a sulfinic phosphoryl ester and protein-based thiosulfinate. Two scenarios for the repair mechanism have been suggested that differ in the second step of the reaction. The attack of Srx or GSH on the Prx-SO(2)PO(3)(2-) intermediate would result in either the formation of Prx-Cys-S(=O)-S-Cys-Srx or the formation of Prx-Cys-S(=O)-S-G thiosulfinates, respectively. To elucidate the mechanism of Prx repair, we monitored the reduction of human PrxII-SO(2)(-) using rapid chemical quench methodology and electrospray ionization time-of-flight mass spectrometry. An (18)O exchange study revealed that the Prx sulfinic acid phosphoryl ester is rapidly formed and hydrolyzed (k = 0.35 min(-1)). Furthermore, we observed the exclusive formation of a thiosulfinate linkage between Prx and Srx (k = 1.4 min(-1)) that collapses to the disulfide-bonded Srx-Prx species (k = 0.14 min(-1)). Thus, the kinetic and chemical competences of the first two steps in the Srx reaction have been demonstrated. It is clear, however, that GSH may influence thiosulfinate formation and that GSH and Srx may play additional roles in the resolution of the thiosulfinate intermediate." @default.
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• W2147968009 date "2008-08-01" @default.
• W2147968009 modified "2023-10-06" @default.
• W2147968009 title "Identification of Intact Protein Thiosulfinate Intermediate in the Reduction of Cysteine Sulfinic Acid in Peroxiredoxin by Human Sulfiredoxin" @default.
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• W2147968009 doi "https://doi.org/10.1074/jbc.c800124200" @default.
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