Biochemical Studies on Quinone Derivatives. I. Effects of Naturally Occurring Benzoquinone Derivatives on Mitochondrial Preparations

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Abstract
Effects of naturally occurring p-benzoquinone derivatives on mitochondrial respiration were studied. Plant quinones, such as rapanone and mesaquinone, stimulated succinate oxidase of intact mitochondria. These quinones and other derivatives reactivated succinate oxidase which was inhibited by acetone-treatment of mitochondria. However methylated quinones did not reactivate efficiently. Reduced dihydroxymesaquinone dimethyl ether reacted with cytochrome c enzymatically, but the reaction was not inhibited by antimycin A addition. The other reduced quinones were reactive with cytochrome c nonenzymatically.

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