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Possible mechanisms for the inhibition or inactivation of enzymes by glutathione-bound mercury. (a) is the physiological mechanism for enzyme action or regulation by the glutathione/glutathione disulfide redox pair; (b) is the interaction of glutathione-bound mercury with the vicinal thiol groups with intermediate transfer of mercury to the vicinal thiol pair, followed by oxidation of the thiols to an intramolecular disulfide and reduction of mercury(II) to the elemental form.
