Figure 4 - full size

 

Figure 4.
Figure 4 Stereoview of a F[o] - F[c] omit map of Glu275 contoured at 2.5 . Green, orientation of the side chain of Glu275 in the starting model (B/Lee/40 NA complexed with sialic acid). Red, fit of Glu275 to the density in the final model of the BANA 207-B/Lee/40 NA complex. A new water molecule is found near the former position of the Glu275 carboxyl group that forms hydrogen-bond interactions with His273 and Arg223. Both Glu275 and the water molecule were omitted for calculation of the electron density shown.

The above figure is reprinted by permission from the IUCr: Acta Crystallogr D Biol Crystallogr (2004, 60, 1017-1023) copyright 2004.