ubiquinone/ubiquinol exchange between the RC and cytochrome b/c1 (12, 17–20). Bio-chemical studies on these systems have shown that PufX is present in the RC-LH1 complex in a 1:1 stoichiometry with the RC and that it has a strong tendency to interact with the LH1 -polypeptide (17). There is evidence that PufX is involved directly in the supramolecular organization of the photosyn-thetic system, prevents LH1 from completely encircling the RC, and perhaps induces a specific orientation of the RC inside the LH1 complex (29). An equivalent gene for the PufX protein has not been identified in the Rps. palustris ge
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