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Figure 3
Tropisetron adopts two poses in the orthosteric site of variant II. (a) The chemical structure of tropisetron. (b) The interacting residues of variant II are shown with C positions colored white for the principal side and cyan for the complementary side, with one tropisetron pose (yellow C positions). Two water molecules discussed in the text are depicted as blue spheres; O and N positions are red and blue, respectively. Selected hydrogen-bonding interactions are shown as blue dashed lines. The second pose, which is common with that adopted in WT AcAChBP (PDB entry 2wnc), is shown with black C atoms.

IUCrJ
Volume 6| Part 6| November 2019| Pages 1014-1023
ISSN: 2052-2525
https://doi.org/10.1107/S205225251901114X