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Catalytic cycle of eukaryotic typical 2-Cys Prx. 1, reaction of a molecule of peroxide with the CP thiolate to form cysteine sulfenic acid. 2, transition from the FF to the LU conformation. 3, reaction of CP sulfenic acid with CR. 4, reduction of disulfide Prx. 5, overoxidation of CP to sulfinic acid. 6, reduction of cysteine sulfinic acid by sulfiredoxin (Srx)/ATP. The protein is represented as one of two active sites within a functional dimer.
