Fig. 3: Surface map views of cryo-EM reconstructions.

Surface map views of cryo-EM reconstructions thresholded to 83% of the expected volume. A Different views (top view, two side views, and a bottom view) of the WT protein (GSFSC resolution 8.2 Å). Top view and bottom view showing fourfold symmetry. The dashed lines in the second view separate the dimer ring stacks. The circle (continuous line) indicates one hexamer while the circles with the dashed line are indicating the three corresponding overlapping hexamers. B Two exemplary views of the S47E/T48E mutant 40mer (GSFSC resolution 12 Å). C Two exemplary views of the S207E mutant 40mer (GSFSC resolution 7.3 Å). Side view (90° from view A). The length of the scale bar is 10 nm.