Abstract
The conditions required to obtain rhodanese inactivation in the presence of dithiothreitol indicate the involvement of hydrogen peroxide produced by metal-ion catalyzed oxidation of dithiothreitol. Inhibition of dithiothreitol oxidation by a chelating agent, or by removal of hydrogen peroxide by catalase prevents the enzyme inactivation. The inactivated enzyme contains a disulfide bond resulting from the oxidation of the catalytic sulfhydryl group and another sulfhydryl group close to it. This disulfide might be formed via a sulfenic intermediate.
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