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Relative distances between the the primary donor P, the intermediary pheophytin acceptor H, and the iron-quinone acceptor Q of bacterial reaction centers were determined by recording laser flash-induced photovoltages in two experimental systems with nanosecond time resolution. In one system a suspension of chromatophores was subjected to a light gradient and in the other system chromatophores were spread at a heptane/water interface. The 10-ns back reaction occurring in reaction centers with reduced Q could be time resolved. The initial photovoltage amplitude under conditions in which the charge separation proceeded up to the state [P(+)H(-)] was about (2/3) of that when it proceeded up to the state [P(+)HQ(-)]. If the amplitude of the photovoltage is considered to be proportional to the spatial displacement of charges, this result means that pheophytin lies closer to Q than to P.

proceedings of the national academy of sciences of the united states of america

Spatial correlation between primary redox components in reaction centers of <i>Rhodopseudomonas sphaeroides</i> measured by two electrical methods in the nanosecond range

Spatial correlation between primary redox components in reaction centers of Rhodopseudomonas sphaeroides measured by two electrical methods in the nanosecond range