Figure 2.
(a,b) The 2F[o] – F[c] ion omit maps (1.5 )
show electron density of ion binding in the K^+ complex (a) and
Rb^+ complex (b) of NaKN 19.
K^+ and Rb^+ ions are colored green, with water molecules
represented as red spheres. (c) The maintenance of an octahedral
ligand arrangement in the K^+ complex, which also holds true for
the Rb^+ complex. Oxygen atoms from the front and back subunits
chelating the ions are shown as red spheres. (d) F[Cs soak] –
F[K] difference map contoured at 10 ,
showing Cs^+ binding at site 3.
The above figure is reprinted
from an Open Access publication published by Macmillan Publishers Ltd:
Nat Struct Biol
(2009,
16,
35-41)
copyright 2009.
)
show electron density of ion binding in the K^+ complex (a) and
Rb^+ complex (b) of NaKN 
19.
K^+ and Rb^+ ions are colored green, with water molecules
represented as red spheres. (c) The maintenance of an octahedral
ligand arrangement in the K^+ complex, which also holds true for
the Rb^+ complex. Oxygen atoms from the front and back subunits
chelating the ions are shown as red spheres. (d) F[Cs soak] –
F[K] difference map contoured at 10