Abstract
In the photosynthetic bacterial reaction center (RC), the electron transfer reaction proceeds from the primary electron donor P, a dimer of bacteriochlorophyll, via an intermediate acceptor (a bacteriopheophytin molecule) to a primary quinone QA and then to a secondary quinone QB. In Rb. sphaeroides RC, both quinones are ubiquinone while in Rps. viridis RC, QA is a menaquinone and QB is a ubiquinone. In addition, charge recombination between P+ and QA − or P+ and QB − proceeds faster in Rps. viridis (≈1 msec and ≈100 msec, respectively [1]) than in Rb. sphaeroides (≈100 msec and a few sec, respectively [2]) RCs. Below 100K, the electron is no longer transferred from QA to QB [3].
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