Figure 3.
NMR structures of trpzips 1 and 2. (A) Ensemble of 20 structures of trpzip1 optimally aligned by using backbone atoms of residues 2–11. (B) Representative structures of trpzips 1 and 2 aligned on the backbone atoms of residues 2–5 and 8–11 (rmsd of the mean coordinates of the aligned backbone atoms in the two ensembles is 0.37 Å); the bottom view is rotated 90° relative to the top view. The backbone carbonyl of residue 6 is indicated to emphasize the difference in turn geometry between the two structures (type II′ for trpzip1 vs. type I′ for trpzip2).