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. 2016 Oct 11;6:34998. doi: 10.1038/srep34998

Figure 4. DNA G·G metal ion zipper of ssDNA.

Figure 4

Magnesium ions are shown in gold. Inner-sphere interactions and outer-sphere H-bonds are shown in orange and wheat lines, respectively. Interacting atoms are shown as ball and stick. (A) DNA G·G metal ion zipper of ssDNA is boxed in gold dashed lines. (B) All nucleotides forming the novel magnesium ion-binding site are represented by sticks. Out-sphere ligand of Lys84B is represented by a grey stick. Red arrow indicates a salt bridge. (C) Nucleotides and waters forming the inner sphere represent Type IIa coordination. (D) Nucleotides forming the same coordination pattern as the RNA metal zipper. (E) Nucleotides forming the same coordination pattern as the RNA G·G metal binding site.