Arrangement of gp6, gp25 and gp53 in the baseplate; reprinted from . A, B, Gp6 is shown in magenta for the "hexagonal" dome-shaped baseplate (left) and in blue for the star-shaped baseplate (right). The C-terminal part of gp6 corresponds to the crystal structure and is shown as a Cα trace with spheres representing each residue. The N-terminal part of gp6 was segmented from the cryo-EM map. The densities corresponding to gp53 and gp25 are shown in white. C, D, The densities of gp53 and gp25 after the density for the whole of gp6 was zeroed out. E, F, The N-terminal gp6 dimers as found in the baseplate wedge. The C-terminal domain is shown as a Cα trace, whereas the N-terminal domain, for which the structure remains unknown, is shown as a density mesh. G, A stereo view of the four neighboring gp6 molecules from the two neighboring wedges of the dome-shaped baseplate. The N-terminal part of gp6 is shown as a density mesh and the C-terminal part corresponds to the crystal structure. H, Schematic of the four gp6 monomers using the same colors as in G. The N-terminal part is shown as a triangle and the C-terminal part as a rectangle.