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. Author manuscript; available in PMC: 2009 Jul 1.
Published in final edited form as: Biochim Biophys Acta. 2008 May 1;1777(7-8):1001–1019. doi: 10.1016/j.bbabio.2008.04.037

Fig. 1. The modified Q-cycle mechanism.

Fig. 1

The mechanism demonstrated in the 1980’s, superimposed on the Rb. sphaeroides structure (PDB file 2QJK). Electron transfers are shown by blue arrows; H+ release or uptake by red arrows, exchange of Q or QH2 by open blue-green (Qo-site) or yellow (Qi-site) arrows; inhibition sites by cyan arrows. See text for description of operation.