Fig. 3: Structure of the top cap and its interaction with the inner genome.

A Ribbon diagrams and surface-rendered representations showing the structure of the top cap. PVIIs are colored salmon, pIXs are colored gold and pVIIIs in layer 3 are colored plum. The surface in side and top views is colored according to the surface electrostatic potential, with red for negative potential and blue for positive potential. B Ribbon diagrams of the coat proteins and surface-rendered representations of the density map of the inner genome DNA showing the contacts of the residues in the lumen with the inner genome DNA. Residues involved in direct contacts with the genome DNA are shown in sticks with the N, O atoms colored blue and red, respectively. The C atoms in the sticks are colored the same as the corresponding ribbon diagrams.