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Figure 9
The 2Fo − Fc electron-density map (blue) contoured around the sodium-ion binding pocket, where Fo represents the observed structure-factor magnitudes, and both Fc and the phases were calculated from the initial model for phasing (PDB entry 4zix). Also shown is the alignment of our structure solution (yellow) and the structure of 5uvj (red) solved by Martin-Garcia et al. (2017BB22). Small deviations are seen more clearly between the structures near the solvent-exposed regions in the yellow and red representations. Waters are seen as red crosses, the sodium ion as a gray cross, and the residues coordinating the sodium atom (Ser60, Cys64, Arg71 and Ser72) as red dashes. The oxygen atoms (in red) seen near the top of the figure have the largest displacement of 0.13 Å among all the atoms shown.

IUCrJ
Volume 5| Part 5| September 2018| Pages 548-558
ISSN: 2052-2525
https://doi.org/10.1107/S205225251800903X