Fig. 1: Cryo-EM structure of the R4C capsid.
From: Structure and proposed DNA delivery mechanism of a marine roseophage
A Icosahedral reconstruction of the R4C capsid, coloured radially from the centre to the outer regions of the density map. B Density map of an asymmetric unit of the capsid (transparent grey) fitted with the corresponding model of the MCPs containing a pentameric monomer (orange) and a hexon (cyan). C Representative section density maps (grey mesh) and corresponding atomic models (sticks) of MCP illustrate the side chain features. D Superimposition of the R4C MCP and HK97 MCP (PDB ID: 1OHG, depicted in grey) shows their structural conservation and variation. Close-up views of the structural variations are shown on the top left and right panels. E Superimposition of pentamer and hexamer MCPs shows the conformational heterogenicity in the N-terminal arms and E-loops. F Cartoon presentations (upper panels) of the top views of a penton (left) and a hexon (right) and the corresponding clipped surface presentations (lower panels) of the side views shows their diversity in height and diameter of the protruding surface.
