Reversed electron transfer in submitochondrial particles causes the oxidation of cytochromes a3 + a and c, and reduction of cytochrome b upon addition of adenosine triphosphate, indicating a crossover point for the energy-linked reversal of electron transfer between cytochromes c and b. The cytochrome component designaged b555 is uniformly observed to show increased absorption in the low to high energy transition and vice versa. It is tentatively identified as a high energy intermediate in the energy transfer pathway. The 555 mµ compound is distinguished from cytochrome c by its presence in KCl-washed cytochrome c-deficient particles and by the lack of evidence for their interconvertibility. Its identification as a cytochrome of type b is confirmed.
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Chance et al. (1966) studied this question.