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Figure 2.
Fig. 2. Structure of the CBD2 Ca^2+ site. (A) The
Ca^2+-binding sites of CBD2. The main chain is shown as blue
ribbons. The two Ca^2+ ions and seven water molecules are
depicted as green and red spheres, respectively. Primary and
secondary Ca are labeled Ca1 and Ca2, respectively. Coordinating
residues are displayed as a stick representation and colored by
atom type (carbon, yellow; oxygen, red; nitrogen, blue).
Interactions of residues with the Ca^2+ ions are represented by
black dashed lines. (B) Ca^2+-free structure. Contacts (salt
bridges with carboxyl residues and a hydrogen bond with a water
molecule) with Lys^585 are shown with dashed black lines. The
main chain is shown as yellow ribbons.
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