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Comparison of the nucleotide-binding site of the TM0853 and PhoQ HKs. Secondary structures surrounding the ATP-binding site are drawn as gray ribbons and the ATP lids are in magenta. The nucleotides and the residues interacting with their phosphates are depicted as sticks and labeled. The Mg2+ ion of PhoQ is drawn as a cyan sphere. Hydrogen bonds are shown as dotted lines. Electron density of the HK853 nucleotide is contoured as a semitransparent blue surface at a level of 1σ.
