Figure 6
Electron-density maps in cation/polyamine-binding sites. The 2m|Fo| − D|Fc| maps are shown in grey and the m|Fo| − D|Fc| maps are shown in cyan. The contour levels of 2m|Fo| − D|Fc| and m|Fo| − D|Fc| maps are 1σ and 2.75σ, respectively. Peaks in the m|Fo| − D|Fc| maps potentially corresponding to ZII are highlighted by red arrows. Yellow dotted lines indicate hydrogen bonds or coordination bonds. Residue names are shown in orange, followed by the chain ID and residue ID as subscripts. The resolution used to draw these maps was 1.5 Å. Other maps are shown in Supplementary Fig. S8. |