Figure 2 - full size

 

Figure 2.
Figure 2. Detail of the W*-loop showing the non-planar peptide linkage between Ser215 and Ala216, and the double conformation of Ser215 that allows the formation of different hydrogen bonds for the stabilization of the W*-loop (stereo view). The s[A]-weighted 2 mF[o] -DF[c] electron density map (colored in blue) at 1.30 Å resolution is contoured at 1.5s.

The above figure is reprinted by permission from Elsevier: J Mol Biol (2000, 302, 155-170) copyright 2000.