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Active site of VXR-(+)-BChE (A) and VXS-(−)-BChE (B) conjugates. BChE crystals were flash-soaked in a 1 mm solution of VXR-(+) (A) or VXS-(−) (B). Key residues are represented by sticks with carbon atoms in blue, oxygen atoms in red, nitrogen atoms in dark blue, phosphorus atoms in orange. Hydrogen bonds are represented by black dashes, and atomic distances are indicated in red (Å). Omit maps are represented by a green mesh, contoured at 3.0 σ.
