FIG. 1.

Hexon structure. Ribbon representation of the Ad2 hexon subunit. The view is perpendicular to the molecular threefold axis from the inside of the molecule. The top of the molecule, which contains the loops (DE1, FG1, and FG2), forms the outer surface of the viral capsid. The hexon base contains a small loop (DE2) and two eight-stranded “viral” jellyrolls (V1 and V2), which are separated by the connector, VC. The eight jellyroll β strands are labeled B to I. The N-terminal loop, NT, lies underneath the base. The secondary structural elements are labeled, as are the positions of chain segments that are not observed in the crystallographic model (<…>). The figure was made with MOLSCRIPT (40).