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Figure 1.
Figure 1 Representative parts of the experimental
electron-density maps for crystal form A calculated with the
MIRAS phases after density modification and phase extension to
2.2 ? resolution. C, N, O, P and S atoms are shown in grey,
blue, red, light green and green, respectively; haem iron
centres are shown in orange. Contour levels are 1.0  (green)
and 9.0 (red)
above the mean density of the map. Figs 1-4 and 6 were prepared
with a version of Molscript46 modified by R. Esnouf for colour
ramping47 and map drawing48 capabilities. a, b, The two haem b
molecules (b[P] in the top half; b[D] in the bottom half of each
panel) and the side chains of some neighbouring residues in the
transmembrane region. c, The covalently bound FAD prosthetic
group.
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