Figure 5.

Features of the AmtB trimer. (A) Rotational correlation analysis of particles ‘a' from p3 (solid line) and p321 (dotted line) maps that do not lie on a crystallographic three-fold axis. (B) Contour plot of particles from the p321 map, one of which (right) lies on the crystallographic three-fold axis while the other (left) is bisected by a single two-fold axis only. Both particles show a low-density region (w), surrounded by three peaks of high density (x) and a ring of six areas of lower density (y and z); those marked with the same letter are related by either crystallographic (right) or noncrystallographic (left) three-fold symmetry.