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Figure 4
Coordination of sodium cations (purple spheres). (a) The Na+ cation bound in subunit A of the Ade/2′-dAdo complex. The coordination bond (dashed lines) distances are listed in Table 6[link]. (b) The Na+ cation bound in the core of the Ade/2′-dAdo complex (the Na–Wat coordination-bond distances are listed in Table 7[link]). Hydrogen bonds are represented by red dashed lines. In both panels, the Fo − Fc OMIT electron density was calculated without the contribution of Na+ to Fc and contoured at 5σ. The domains are colour-coded as in Fig. 1[link]. Water molecules are represented as red spheres.

IUCrJ
Volume 4| Part 3| May 2017| Pages 271-282
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517002433