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Figure 1.
Fig. 1. Schematic of cyt b[6]f complex in a membrane
bilayer (a), a detergent micelle (b), and a detergent-lipid
mixture (c). The 13 transmembrane helices predicted for the
complex are shown, with cyt b[6] (pink) and subunit IV (yellow)
having four and three transmembrane spans, respectively. In b,
the greater conformational freedom of the subunits of the
protein complex in the detergent micelle is depicted
qualitatively by an exaggerated tilting of the  -helices.
The prediction of a more ordered ensemble of subunits in the
presence of a low stoichiometry of lipid (  10 per
monomer) is shown. Red, lipid head group; green, detergent head
group.
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