Figure 6.

The MP Replaces a CP Dimer

(A) A view through the pilus on to the capsid beneath at 2.5 σ.

(B) A close-up from an identical viewpoint, but with the pilus density clipped away, showing the point of interaction. This position is occupied by a C/C-type dimer on a 2-fold axis in the icosahedrally averaged structure.

(C) An oblique view of the same point from the side, showing that density at this point is different from all other 29 equivalent positions.

(D) A 25-Å-thick section through the complex (the view in Figure 3A) showing the coordinates for a C/C dimer and their poor fit to density that we ascribe to MP. The disruption of the capsid structure around this point is indicated by the large pores at either side.

(E) A close-up view of the interaction between virus and pilus. The section is thicker (35 Å) and at a lower contour level (2.1 σ) than in (D) to show connected density between pilus and virus.

See also Movie S6.