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. 2009 Dec 15;285(8):5859–5867. doi: 10.1074/jbc.M109.071233

FIGURE 4.

FIGURE 4.

Coordination of the Mg2+ ion. The Mg2+ ion is tightly coordinated by oxygen atoms of the β- and γ-phosphate, Ser233 of switch I, Thr112 of the P-loop, and two water molecules. The ion location is quite similar to that seen in the Eg5·ADP structure (18), in which the Mg2+ ion is coordinated by Thr112, a β-phosphate oxygen atom, and four water molecules.