Figure 8.

Structure of 5BSL3.2 is sensitive to Mg²⁺ concentration. (A) Ion electrostatic free energies for the different 3D structures of 5BSL3.2 at different Mg²⁺ concentrations. The structures that have the lowest free energy are labeled with circles at 0 and 6 mM Mg²⁺. (B and C) Structures 9 and 10, respectively, with the predicted bound Mg²⁺ ions at 2 mM Mg²⁺. Loop residues U₉₂₈₀–G₉₂₉₁ are colored red, bulge residues A₉₂₉₈–G₉₃₀₄ yellow, and residues in the main helix blue.