A new model of superoxide dismutase (SOD) functioning has been proposed on the basis of recent data. This model takes into account both experimental data and results of quantum mechanics calculations. One substrate molecule (superoxide radical) binds copper ion in active center of SOD, and the second superoxide radical interacts with a peripheral region of the enzyme. Uncoupled electron from the active center is transferred to the peripheral superoxide anion. This results in formation of oxygen molecule in the active center, and of hydrogen peroxide molecule in the peripheral region.
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