Abstract
The primary reaction in the bacterial reaction center (RC) from Rhodobacter sphaeroides is the absorption of light by the primary electron donor, D, and the subsequent fast electron transfer via several intermediate acceptors, a bacteriopheophytin, ΦA, a primary ubiquinone, QA, to the secondary ubiquinone, QB. The quinone in the QB site is capable of accepting two electrons to form the hydroquinone species and exchange with the quinone pool, whereas the quinone bound at the QA site serves as a one electron gate. Compared to the QB site the quinone at the QA site is very tightly bound and does not exchange with the pool. In Rhodopseudomonas viridis and in the photosystem I of green plants a menaquinone is found as the primary electron acceptor.
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