FIGURE 3.

Mg²⁺ coordination in the catalytic site of F₁. As deduced in Ref. 40. Green sphere, Mg²⁺; cyan spheres, water molecules in the first coordination shell. Residues involved in Mg²⁺ coordination are β-Thr-156, β-Glu-185, and β-Asp-242. The catalytic carboxylate β-Glu-181 is not involved, although it is in close proximity. This figure was reprinted from Ref. 45 with permission.