Figure 7 - full size

 

Figure 7.
Fig. 7. Influence of two salt bridges on the regularity of helix composed of residues 20-33. The first such interation between Glu27 and Arg30 breaks the helix at Tyr31. The second, the result of interaction between Arg20 and Asp23, creates a bulge near the N-terminus of this helical segment.

The above figure is reprinted by permission from the IUCr: Acta Crystallogr D Biol Crystallogr (1996, 52, 435-446) copyright 1996.