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. 2015 May 19;108(10):2591–2600. doi: 10.1016/j.bpj.2015.04.015

Figure 7.

Figure 7

Variation of the three topological parameters as a function of the inclination angle ρ and the linker length L. The contour plots are consistent with the conformation energy map presented in Fig. 6. (A) The excess twisting of the linker DNA, ΔTw (compare with Fig. 3, E and F). The ΔTw values are expressed in the number of DNA helical turns (or degrees/360). (B) The writhing number per nucleosome, Wr. (C) Change in the linking number per nucleosome, ΔLk (relative to the relaxed state of DNA). See Fig. S12 for additional details. (D) Classification of the fiber conformations: three families of topoisomers. The cyan region represents family T2 with the lowest ΔLk values (approximately from –2.2 to –1.5). The yellow region corresponds to the family T1 with intermediate ΔLk (from –1.2 to –0.5). The highest ΔLk values define family T0 (approximately from 0 to 0.5). The ovals denote energetically optimal regions shown in Fig. 6. To see this figure in color, go online.