FIGURE 2.

Ca²⁺ coordination

Ca²⁺ coordination in calmodulin (A), the Slo1 RCK2 sensor (B), and the Slo1 RCK1 sensor (C). For each, the Ca²⁺-free apo structure is shown at left and the Ca²⁺-bound structure is shown at right. The image was rendered in MacPyMol version 0.99. The Ca²⁺-ligating residues are shown using sticks. Ca²⁺: yellow sphere; carbon: green; nitrogen: blue; oxygen: red. Water molecules participate in Ca²⁺ coordination, but they are not shown.