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Figure 5.
Divalent metal ion coordinations in the complex structures. (A) A close up
stereo view of the Ba^2+ ion binding site in the HutP-L-histidine-Ba^2+ complex. Hydrogen
bonds are indicated by broken lines. The L-histidine ligand and the protein residues are
represented by ball-and-stick models colored by atom type, as shown in Figure 4c. The
Ba^2+ and water molecules are represented by cpk models in magenta and red, respectively.
The electron density around the metal ion was contoured at 3 {sigma} level. (B) A
close-up stereo view of the non-specific Ba^2+ ion binding site and its interactions. The
electron density around the metal ions was contoured at 3 {sigma} level. Hydrogen
bonds and the color scheme are described in Figure 5a.
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