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J. Biol. Chem., Vol. 259, Issue 7, 4015-4018, 04, 1984

Iron-sulfur cluster 3 of beef heart succinate-ubiquinone oxidoreductase is a 3-iron cluster

BA Ackrell, EB Kearney, WB Mims, J Peisach and H Beinert

From a study of the magnetic field dependence of the linear electric field effect (LEFE) in EPR spectroscopy, we demonstrate that iron- sulfur cluster 3 in air-oxidized, beef heart succinate-ubiquinone oxidoreductase (Complex II) is a 3-iron cluster. This suggests that cluster 3 may arise by oxidative degradation from a 4-iron cluster originally present in the enzyme and may be reconverted back into a 4- iron cluster under reducing conditions. Linear electric field effect studies of succinate-reduced Complex II are in accord with the view that cluster 1 is a 2-iron cluster.
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