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Figure 4.
Ca^2+-binding site of BdbD.A, detailed view (contoured at 1.2
σ) of the Ca^2+-binding site of sBdbD, showing monodentate
ligands Gln^49 and Glu^115, bidentate Asp^180, and three
crystallographically ordered water molecules. B, an ideal capped
octahedral site for comparison with that observed in BdbD.
Positions of the idealized capped octahedron correspond to the
following: I, Gln^49O-ϵ; II, Glu^115O-ϵ; III–V, waters; VI
and VII, Asp^180O-δ1 and Asp^180O-δ2. Ca^2+-ligand distances
are indicated.
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