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Figure 3
The mononucleotide-binding pocket in VcCMAS. (a) The residues that contact the bound CDP are shown in stick representation. Hydrogen bonds are shown as red dashed lines with distances in Å. Mg2+ is represented as a magenta sphere. CDP and Mg2+ are encased in an Fo − Fc electron-density map contoured at 3.0σ (inset). (b) Mg2+ interacts with the invariant Asp215, the α-phosphoryl group of CDP and three water molecules. CDP, Mg2+ and the metal-coordinating residues are encased in a 2Fo − Fc electron-density map contoured at 1.0σ.

Journal logoSTRUCTURAL
BIOLOGY
ISSN: 2059-7983
Volume 75| Part 6| June 2019| Pages 564-577
https://doi.org/10.1107/S2059798319006831
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