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Determination of the Functional Size of Superoxide Dismutases by Radiation Inactivation Analysis



Five different superoxide dismutases (SODs) representing the three classes of SODs (FeSOD, MnSOD and CuZnSOD) were analyzed by the radiation inactivation technique, which is a unique method for the determination of the functional mass of oligomeric proteins. All SODs showed a single exponential inactivation curve, with a radiation target size corresponding to the dimer of each of the enzymes, suggesting that the dimer is the functional unit of SODs.
