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Figure 2.
Figure 2. Structural changes within the RC in response to bright
light. (a) Reproducible difference electron density features
(yellow, negative density; blue, positive density) are large
spheres (observed in all six difference Fourier maps) and small
spheres (observed in five of six). Statistics are given in
Supplementary Table 2 online. Arginines with increased trypsin
susceptibility in bright light are red, and those with decreased
susceptibility are blue. The H subunit is cyan. (b) Refined
structural changes. Arrowheads indicate the relative magnitude
and direction of the movements (blue, positively charged
residues; red, negatively charged residues; gray, every fifth
residue). Surface-exposed histidines are green, buried water
molecules red and the C-terminal  -helix
gray. The subdomain from Pro121H to Thr226H (purple) experiences
a net electrostatic force (yellow vector) due to interactions
with Q-[A] (red).
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