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. 2013 Aug 6;8(8):e71420. doi: 10.1371/journal.pone.0071420

Figure 8. Intrastrand tri-dentate cation/FSW orientations in the major groove.

Figure 8

a) One of three examples in 1jgr between TL2101 and a CG step. The Tl+ ion forms an ion-dipole interaction with O6 and N7 of G2004 while simultaneously interacting with the pi system of C2003. Inset is interaction schematic for 1jgr. b) Example in 423d between Mg29 FSWs and a CG step. Two Mg29 FSW, W520 and W518 hydrogen bond with N7 and O6 of G10 respectively while both form cation-pi interactions with the adjacent base C9. c) Side view of two FSW of Mg22, W143 (proximal) and W147 (distal) interaction, through hydrogen bonds with N7 and O6 of G6 respectively and cation-pi with neighboring C5 at the distances shown. FSW (light green); ions (dark green); base ring centroid (purple).