Figure 6.

The spherical densities of the junction bending and twisting angles for structures in the optimized ensembles, shown as a function of [KCl]. The density of structures is indicated using the scale at right, with higher density regions indicated by a brighter “hot spot.” Motion of the hot spot is clearly seen, underscoring the observed structural transitions. Below ∼200 mM KCl, the angles increase. At high salt, an unexpected hot spot appears at small angles, reflecting extended states and stacked bases along the junction. To see this figure in color, go online.