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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Photosynthetic electron transfer through the cytochrome b6f complex can bypass cytochrome f.

The cytochrome b(6)f complex is an obligatory electron transfer and proton-translocating enzyme in all oxygenic photosynthesis. Its operation has been described by the "Q-cycle." This model proposes that electrons are transferred from plastoquinol to plastocyanin (the reductant of P700 in Photosystem I) through, obligatorily in series, the iron-sulfur and the cytochrome f redox centers in the cytochrome b(6)f complex. However, here we demonstrate that (a) the iron-sulfur center-dependent reductions of plastocyanin and P700 are much faster than cytochrome f reduction, both in Chlamydomonas reinhardtii cytochrome f mutants and in the wild type, and (b) the steady-state photosynthetic electron transport does not correlate with strongly inhibited cytochrome f reduction kinetics in the mutants. Thus, cytochrome f is not an obligatory intermediate for electrons flowing through the cytochrome b(6)f complex. The oxidation equivalents from Photosystem I are delivered to the high potential chain of the cytochrome b(6)f complex both at the cytochrome f level and, independently, at another site connected to the quinol-oxidizing site, possibly the iron-sulfur center.[1]

References

  1. Photosynthetic electron transfer through the cytochrome b6f complex can bypass cytochrome f. Fernández-Velasco, J.G., Jamshidi, A., Gong, X.S., Zhou, J., Ueng, R.Y. J. Biol. Chem. (2001) [Pubmed]
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