Abstract
The Photosystem I reaction center in green plants and cyanobacteria is a thylakoid-embedded, multi-protein complex containing antenna chlorophyll a (and b) molecules, a chlorophyll electron donor, P700, a chlorophyll electron acceptor, A0, a quinone intermediate electron acceptor, A1, and three iron-sulfur clusters, FX, FB, and FA [see ref. 1 for review]. The function of the acceptor molecules is to stabilize the transient charge separation between the primary reactants, P700 and A0, by permitting rapid forward electron transfer to outcompete the inherent backreaction between the initial primary reactants. The iron-sulfur clusters, FX, FB and FA, are clearly essential in stabilizing the early events of charge separation in Photosystem I.
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