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Figure 4.
Fig. 4. AMPPNP binding site. Upper panel, plot of the
interactions between AMPPNP-Mg2+ and the protein drawn with the
program LIGPLOT (40). Lower panel, stereoview of structural
elements that form the ATP binding site in PhoQ-KD. Helices and
strands are partially transparent with the same colors as in
Fig. 1A. the AMPPNP molecule (yellow) and interacting side
chains (green) are depicted as ball-and-stick with the same
colors as in upper panel. Carbon, nitrogen, oxygen, and
phosphate are drawn in gray, blue, red, and black, respectively.
Water molecules are cyan spheres, and the Mg2+ ion is a green
sphere. Hydrogen bonds are shown as dotted magenta lines and the
magnesium coordination as dotted black lines.
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