Figure 2.
Fig. 2. Stereoview of the Cd^2+ binding site (orange) on
the RC from Rb. sphaeroides. The six Cd^2+ ligands are His-H126,
His-H128, Asp-H124 (green), and three water molecules (red). Two
nearby aspartic acid residues, Asp-L210 (yellow) and Asp-M17
(blue), are part of a hydrogen bonding network that leads from
the metal site to Q[B] (see Fig.
5). |F[o]| |F[c]|
difference electron density (purple) is contoured at 2.5 and
superimposed on the structure. To reduce phase bias, ligands
were excluded in the calculation of the map.
(see Fig.
5). |F[o]| 
|F[c]|
difference electron density (purple) is contoured at 2.5 
and
superimposed on the structure. To reduce phase bias, ligands
were excluded in the calculation of the map.