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Figure 10
Sulfate ion binding contributes to the crystal packing of HIRA(644–1017). (a) Stereo view of the crystal packing around the asymmetric unit trimer. Subunits A, B and C of the asymmetric unit trimer are shown in cyan, light orange and magenta, respectively. Three adjacent crystallographic symmetry-related trimers sym1 (x + 1/2, y − 1/2, z), sym2 (x, y − 1, z) and sym3 (x, y + 1, z) are shown in light green, light blue and blue, respectively. Three sulfate ions, S1, S2 and S3, are shown as yellow spheres. (b) S1 (subunit A) interacts with His832 and Ser932 in the same subunit. (c) S2 (subunit B) interacts with three His908 residues (subunit B, subunit A of sym1 and subunit C of sym2) and three water molecules (subunit B). Water molecules are shown as red spheres. (d) S3 (subunit C) interacts with Leu903 (subunit C), Phe904 (subunit C), Ser905 (subunit C) and Arg720 (subunit A of sym3). Arg720 (subunit A of sym3) interacts with Arg902 (subunit C). The mFo − DFc simulated-annealing (SA) omit map and the anomalous difference Fourier map of phasing data (Ray-Gallet et al., 2018View full citation) for each sulfate ion are shown in pale cyan and pink, respectively. The density is contoured at 3σ.

IUCrJ
Volume 13| Part 2| March 2026| Pages 169-183
ISSN: 2052-2525
https://doi.org/10.1107/S2052252526000072