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Figure 6.
FIG. 6. A, ATP recognition by bsTrpRS and drTrpRS II. A,
ATP binding site of bsTrpRS in the open conformation (Protein
Data Bank code 1MAW [PDB]
). B, ATP binding site of drTrpRS II with F[o] - F[c] electron
density map (red, 3.5;  , green, 2.5 )
calculated with Mg-ATP removed from F[c]. C, active site of
bsTrpRS in closed pretransition state with ATP bound (Protein
Data Bank code 1M83 [PDB]
). In both bsTrpRS and drTrpRS II, magnesium is solely
coordinated by the phosphates of ATP.
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