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Figure 4.
Figure 4. Q[B] binding sites of RCsph. All pictures are
represented in stereoview. (a) Arrangement of the cofactors Q[A]
and Q[B], subunits H, L, M and the location of the membrane in
RCsph. The colouring scheme is: H, L, M subunit (dark grey),
cofactors Q[A] (red), Q[B] (orange). The approximate position of
the membrane is indicated by the light grey square. (b) Refined
electron density for the Q[B] binding pocket. The 2F[o] – F[c]
map is contoured at 1σ. (c) Simulated-annealing omit map
omitting Q[B] contoured at 1σ. (d) Superposition of ubiquinone
in the Q[B] binding pocket. Colour code and PDB entries: red,
1YST;^43 light green, 1AIG;^45 dark green, 1AIJ;^45 blue,
1RG5;^44 orange, present structure 2GNU.
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