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  • Title: Ethylene enhances reactivity of superoxide with peroxidase to form the oxy-ferrous complex.
    Author: Smith AM, Morrison WL, Milham PJ.
    Journal: Biochemistry; 1983 Mar 29; 22(7):1645-50. PubMed ID: 6303390.
    Abstract:
    Ethylene and its analogues acetylene, carbon monoxide, and propylene inhibited the rate of oxidation of indole-3-acetic acid by peroxidase. Annulment of this effect by addition of superoxide dismutase showed that inhibition occurred only in the presence of the superoxide anion radical (O2-.). Kinetic and spectral data established that ethylene and its analogues enhanced markedly the rate of reaction of O2-. with peroxidase. This reaction resulted in the formation of compound III, an oxy-ferrous complex of peroxidase. In the presence of indole-3-acetic acid, the interaction between ethylene, peroxidase, and O2-. activated the reduced peroxidase in equilibrium compound III shuttle. O2-. is a major product of this shuttle, and compound III constitutes the dominant steady-state form of peroxidase. These interactions may help to explain the mechanism of action of ethylene as a plant growth regulator.
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