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Redox potentials for two inactivating intrasubunit disulfides that link helix-5 and helix-9 in mutant Escherichia coli malate dehydrogenases have been determined. The E m is -285 mV when cysteines are at positions 121 and 305 and -295 mV when the cysteines are at positions 122 and 305. Oxidation to the disulfide affects k cat but not K m values. In the single V121C...
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