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Figure 3
(a) AC domains in WT OaPAC (SFX; PDB entry 9f1w) showing the metal ion binding sites and surrounding residues; green spheres represent calcium ions and red spheres represent water molecules. (b) Zoom in on the dimer interface and the internal calcium binding sites with coordinating residues. (c, d) Zoom in on the calcium binding sites on the surface of WT OaPAC. (e) Micro-PIXE analysis of WT OaPAC crystals confirms the presence of calcium and magnesium ions in the crystals.

IUCrJ
Volume 11| Part 6| November 2024| Pages 991-1006
ISSN: 2052-2525
https://doi.org/10.1107/S2052252524010170