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. Author manuscript; available in PMC: 2012 Apr 13.
Published in final edited form as: Structure. 2011 Apr 13;19(4):496–502. doi: 10.1016/j.str.2011.02.010

Figure 4.

Figure 4

Remodeling of the gp1 crystal structure to fit the P22 virion density map. (A) Stereo, close-up view of the back half of the proximal part of the portal barrel (grey surface) into which the gp1 crystal structure (red, ribbon model) is fitted. The model fits the portal core density quite well (“core” consists of residues 1-602 and only the topmost portion appears in this view at the bottom of the panel). Above the core, the model deviates significantly from the density map. For example, the helices traverse empty (low density) space and then line up out of register with tubular density features that follow a slewed path and clearly define the wall of the barrel. The adjusted model (green) fits the density map better with regions pointed by two arrows (1) and (2) highlighted in the cross-sections shown in (B) and (C). See also supplemental Movie M1.