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Figure 1.
Fig. 1. Electron-density maps of M1, M2, and M3 in complex
with BNA. Shown are stereoviews of F[o] - F[c] electron-density
maps calculated at respective resolutions indicated in Table 1,
after the initial cycle of refinement with no ligand in the
model. The initial model included leucine at position 124, and
for the M1 and M3 complexes the extended electron density
clearly suggests the existence of an arginine residue at this
position. The maps were constructed at 2.0  with superimposed
coordinates from the final models.
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