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Figure 1
Crystal packing in the ac plane of (a) AUC (PDB entry 5e54), (b) TUC1 (PDB entry 6vwt) and (c) BUC (PDB entry 4tzx), as observed by continuous AFM of the same crystal, and the associated structures determined by X-ray crystallography. The molecular interfaces (P2–P2, P1–P1, P2–L3 and L3–latch) in each phase are highlighted with colored boxes, and respective zoomed-in views are shown. The atomic inter­actions at each interface are shown as sticks with a transparent molecular surface. 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 0.15 mM and 10 mM, respectively.

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