[Activation of succinate oxidase in the inner membrane of rat liver mitochondria].

It is shown that the process of activation of succinate oxidase from inner membranes of the rat liver mitochondria by succinate and malonate is specific for the succinate dehydrogenase component of oxidase. These activation constants are comparable with those found by other authors in activation of succinate dehydrogenase and succinate oxidase from oxaloacetate-preincubated submitochondrial fragments of the bull heart. Probably, the 4-fold activation of succinate oxidase from inner membranes of the liver mitochondria reported in this paper depends on separation of endogenous oxaloacetate from the succinate dehydrogenase component of oxidase.