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In bacterial photosynthetic reaction centers (bRC), the electron is transferred from the special pair (P) via accessory bacteriochlorophyll (B A ), bacteriopheopytin (H A ), the primary quinone (Q A ) to the secondary quinone (Q B ). Although the non-heme iron complex (Fe complex) is located between Q A and Q B , it was generally supposed not to be redox-active...
To elucidate the role of the non-heme iron complex (Fe-complex) in the electron transfer (ET) events of bacterial photosynthetic reaction centers (bRC), we calculated redox potentials of primary/secondary quinones Q A/B (E m (Q A/B )) in the Fe-depleted bRC. Removing the Fe-complex, the calculated E m (Q A/B ) are downshifted by ∼220mV/∼80mV explaining both...
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