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Figure 3
Crystal packing in the ab plane of (a) AUC, (b) TUC1 and (c) BUC, as observed by continuous AFM of the same crystal, and the associated structures determined by X-ray crystallography. The molecular interfaces (P2′–P2′, P3–L2, L3–latch) observed in AFM images are highlighted with colored boxes. The atomic interactions at each interface are shown as sticks with transparent molecular surfaces. Hydrogen-bond interactions are drawn as yellow lines. The unit-cell dimensions derived from X-ray diffraction or AFM are listed in Tables S3 and S4. AFM images are 30 × 30 nm in size and 0.5 nm in height (dark-to-light color scale). Ligand concentrations for AFM and TRX experiments were 0.05 and 10 mM, respectively.

IUCrJ
Volume 8| Part 4| July 2021| Pages 655-664
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521004826