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. Author manuscript; available in PMC: 2016 Jun 19.
Published in final edited form as: J Mol Biol. 2015 Apr 8;427(12):2205–2219. doi: 10.1016/j.jmb.2015.03.022

Fig. 7.

Fig. 7

Cation coordination by guanine quartets. (a) Coordination of a Sr2+ cation, shown in green, between the eight guanine O6 atoms of two G-quartets, shown in magenta. (b and c) Views of a UGGGGU octamer emphasizing the regular arrangement of O6 atoms about the central cation induced by the structure's helical twist. Coordinates are from the refinement of data set P1B.