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Figure 1
(a) WT OaPAC crystals used at the EuXFEL. Crystal size <15 × 15 × 5 µm3; the scale bar corresponds to 50 µm. (b) Ribbon diagram of the SFX structure of WT OaPAC; monomeric OaPAC, grey; BLUF domain, orange; α3 helix, light orange; α4 helix, bright orange; AC domain, yellowish-orange; calcium ions are represented by spheres. (c) Flavin active site of OaPAC in the SFX structure (PDB entry 9f1w) showing key amino-acid residues participating in the hydrogen-bond network. 2mFo − DFc electron-density maps are represented as blue (flavin) and light purple (residues) meshes at a contour level of 1.0σ.

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