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Figure 2.
Figure 2. Structures of the KcsA selectivity filter solved in a
high concentration of K^+ (a), Rb^+ (b), Tl^+ (c), and a low
concentration of K^+ (d). The structures solved in the absence
of TBA are colored in yellow (PDB code 1K4C (a), 1R3I (b), 1R3J
(c) and 1K4D (d)). The structures solved in the presence of TBA
are colored in red, covered with F[o]–F[c] omit map (blue,
contoured at 3σ ((a), (b) and (d)) or 2.5 σ (c)). The maps are
calculated using a model with both the filter (residues T74 to
G79) and ions removed. The pink electron density maps are
F[o]^TBSb–F[o]^TBA difference maps countered at 10σ for (a)
and (c), 18σ for (b), and 12 σ for (d). Figure 2.
Structures of the KcsA selectivity filter solved in a high
concentration of K^+ (a), Rb^+ (b), Tl^+ (c), and a low
concentration of K^+ (d). The structures solved in the absence
of TBA are colored in yellow (PDB code 1K4C (a), 1R3I (b), 1R3J
(c) and 1K4D (d)). The structures solved in the presence of TBA
are colored in red, covered with F[o]–F[c] omit map (blue,
contoured at 3σ ((a), (b) and (d)) or 2.5 σ (c)). The maps are
calculated using a model with both the filter (residues T74 to
G79) and ions removed. The pink electron density maps are
F[o]^TBSb–F[o]^TBA difference maps countered at 10σ for (a)
and (c), 18σ for (b), and 12 σ for (d).
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