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. 2011 Mar 14;108(13):5272–5277. doi: 10.1073/pnas.1014186108

Fig. 5.

Fig. 5.

Crystal structure of E71A KcsA features a noncollapsed selectivity filter. (A) Stick model of selectivity filter from E71A KcsA in the presence of 150 mM NaCl and the absence of K+ and accompanying electron density (2Fo-Fc) contoured at 1.0σ. Residues G77 and T75 are labeled. For comparison, (B) stick models of filters of the conductive (Left) and collapsed (Right) states of WT KcsA [1K4C and 1K4D (12)]. (C) Stick models of filters of the nonflipped (Left) and flipped (Right) structures of E71A KcsA [2ATK and 1ZWI (15)]. Bound ions are purple (Na+) or cyan (K+) spheres.