FIGURE 4.

Parameters for worm-like chain model. (A) A histogram of the distances between successive ssDNA phosphorus atoms obtained from various ssDNA-protein crystal structures with the average distance being b₀ = 6.3 (±0.8) Å. We assumed that the contour length of a ssDNA with N nucleotides is given by b₀N. (B) Root mean square deviation between E and E_sim averaged over all NaCl concentrations versus the random walk step size δ (•). The line is a second order polynomial fit that shows a minimum near δ = 5.5 Å.