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Using the technique of flash photolysis‐electron spin resonance, we have detected, by means of a kinetic analysis, a rapidly decaying signal in reaction center preparations from the R26 blue‐green mutant of Rhodopseudomonas spheroides. This signal, which we designate Signal B3, is essentially the same as that seen previously in iron‐free preparations. Signal B3 decays at 20°C with a 1/ e time of ˜ 3 ms and exhibits an activation energy of 5 ± 1 kcal mol ‐1 over the temperature range 0–30°C. Extraction with isooctane completely eliminates Signal B3, whereas readdition of exogenous ubiquinone‐30 completely restores the signal. o ‐Phenanthroline has no effect on Signal B3. We discuss these results in terms of a model in which the primary acceptor is an iron‐ubiquinone complex with excess ubiquinone serving as a secondary electron acceptor pool.
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Bolton et al. (1973) studied this question.
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