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. Author manuscript; available in PMC: 2016 Sep 10.
Published in final edited form as: Nature. 2016 Mar 10;531(7593):258–262. doi: 10.1038/nature17194

Figure 3. Voltage-dependence and its modulation by ions.

Figure 3

Side (left) and top (right) views of Ca2+-binding sites in a, VSDI and b, VSDII. Ca2+ ions are shown in green. Ion coordinating residues are labeled in VSDI and II. Voltage-sensing residues are shown in VSDII. Ba2+ (cyan) and Yb3+ (magenta) isomorphous difference density peaks and atom positions contoured at 10σ numbered according to Extended Data Fig. 2c.