Figure 4

Positive and negative electrostatic potential isosurfaces at a contour level of ±1 KT/e are depicted in red and blue colours, respectively. (a1–c1) Different orientations of the conformation corresponding to the minimum of the first eigenvector of the DBD tetramer ED (Figure 3b). (a2–c2) Same orientations as panels a1–c1 for the conformation corresponding to the maximum of the first eigenvector of the DBD tetramer ED (Figure 3b).