FIG. 7.

Resolving the KFV turret structure. (a) Views of the reconstruction of a single-turreted KFV, viewed from above the virus surface (left, surface not in view) and from the side, through the fivefold vertex (right). The map is contoured at three levels, 1.5σ, 2σ, and 4σ, to show the relative strengths of the density for different portions of the turret and the steep density gradient defining the edges of the structure. Identical features in the two views are labeled i to iii. (b) Views down fivefold, threefold, and twofold axes (left to right, respectively) of the complete KFV capsid generated using icosahedral symmetry from an asymmetric unit derived from the single-turreted reconstruction.