An effect of malate on the redox state of a cytochrome b component in mitochondria from various sources

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Abstract

During a study of the respiratory chain of mitochondria from the spadix of Arum maculatum, it was noticed that the degree of reduction of the cytochrome b components in the anaerobic state varied with the substrate used and furthermore that L-malate appeared to cause a specific reoxidation of a b-type cytochrome on addition to mitochondria which had been allowed to go anaerobic with succinate as substrate or, alternatively, had been reduced by sodium dithionite. We report these findings here, and also some preliminary observations on mitochondria from other sources, which indicate that the effect of malate on cytochrome b components may be a widespread phenomenon.

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