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. 1998 Sep 15;95(19):11163–11168. doi: 10.1073/pnas.95.19.11163

Figure 1.

Figure 1

Scatter plots in the Twist–Roll plane of base step parameters in protein-bound and B–DNA crystal complexes. Dots correspond to the “unperturbed” P⋅DNA sample used in averages (Table 1) and derived deformabilities (Table 2) and circles to states of extreme bending, twisting, and stretching (included in B– and P′⋅DNA samples). Rectangles enclose points lying within three rms (3Δθ) deviations of 〈Twist〉 and 〈Roll〉. Ellipses are projections of the six-dimensional equi-potential surfaces on the Twist–Roll plane obtained from the 2 × 2 Twist–Roll covariance matrix (see text); these contours correspond to energies of 4.5 kBT (“3Δθ ellipses”). Histograms on the edges of the scatter plots are scaled with respect to a value of unity for the most populated angular ranges (422–474 occurrences in P⋅DNA and 162–168 for B–DNA).