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![[Figure 1]](rr5250fig1mag.jpg)
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Figure 1
Crystal pathology. Models of the Env-GH191 crystal structure. (a, b) Triple-cell model representing an ordered fragment of the actual crystal structure and used for map deconvolution and model building; (c, d) a convoluted crystal model with unit-cell dimensions determined during data processing, where chain B has occupancy 1/3 and overlaps with one of its symmetry equivalents. The maps in (b) and (d) are for the areas indicated by the black boxes in (a) and (c). The contour level of the 2Fobs − Fcalc map in (d) is 0.5σ, three times lower than in (b), to compensate for the partial occupancy of chain B in the convoluted crystal model. Chains forming the asymmetric unit in (a) and (c) are highlighted. Chains A, B and C shown in green, yellow and orange, respectively, in (a) and chain A (green) in (c) represent ordered layers of molecules, and chains D (magenta in both panels) represent the sparse layers. In the sparse layer of the real crystal, the voids and allowed orientations of molecules occur in random order. This figure was made using PyMOL (Schrödinger; DeLano, 2002  ). |
![[Figure 1]](rr5250fig1.jpg)
 | STRUCTURAL BIOLOGY |
ISSN: 2059-7983
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