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Figure 5.
Fig. 5. Stereo representation of hydrogen bonding
networks in the charge-separated (D^+Q[A]Q[B]  ) state of
the native RC (7, 18) from Rb. sphaeroides spanning the region
between the Cd^2+ (or Zn2+) binding site (indicated by arrow)
and Q[B] . L
subunit (yellow), M subunit (blue), and H subunit (green), and
Q[B] and water
molecules (red). Dashed lines represent hydrogen bonds. Wat-72
is displaced when Cd^2+ or Zn2+ binds. The metal ion is located
at the proton entry point.
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