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. 2013 Apr;141(4):445–465. doi: 10.1085/jgp.201210856

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© 2013 Kulleperuma et al.

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Figure 7. — Structural fluctuations of the two channel constrictions in model R2D. (A) Configurations of the D112–R208 salt bridge (from left to right: bidentate, monodentate, and open). Hydrogen bonds are shown as orange lines. (B) Probability distribution of d₁, the distance between atom Cγ of D112 and atom Cz of R208. (C) Closed (left) and open (right) conformations of F150 and R211. (D) Probability distribution of d₂, the distance between the center of the benzyl ring of F150 and atom Cz of R211. (E) Two-dimensional probability distribution of d₁ and d₂, with increasing probability from purple to yellow.