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The saturation kinetics of NADH and succinate oxidation for Coenzyme Q (CoQ) has been re‐investigated in pentane‐extracted lyophilized beef heart mitochondria reconstituted with exogenous CoQ 10 . The apparent ‘ K m ’ for CoQ 10 was one order of magnitude lower in succinate cytochrome c reductase than in NADH cytochrome c reductase. The K m value in NADH oxidation approaches the natural CoQ content of beef heart mitochondria, whereas that in succinate oxidation is close to the content of respiratory chain enzymes.
Estornell et al. (Mon,) studied this question.
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