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Figure 5.
Figure 5. Close-up stereo view at the active site residues
with sixfold averaged electron density. Nitrogen, oxygen,
sulfur, and carbon atoms are dark gray, medium gray, light gray,
and white, respectively. The 2mF[obs] - DF[calc] total density
is shown with weak line contours at a 1  level and the
mF[obs] - DF[calc] difference density is shown with strong lines
and contoured at 4 . The
carboxylate groups of Asp 181 and Asp 187 are unexpectedly close
but residual density present in between may indicate the
presence of a positive countercharge, for example, a partially
occupied Cd^2+ ion (not included in the model). This figure was
made with BOBSCRIPT (Esnouf 1999).
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