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Figure 3
XRD electron-density maps of NgbCO at 40 K and of Ngb*CO at 15 K. (a) Close-up view of the heme pocket of NgbCO in the crystal structure determined at 40 K without illumination, showing a 2Fo − Fc electron-density map contoured at 1.5σ. The occupancy of CO bound to the heme was estimated to be 90%. (b) Close-up view of the heme pocket of Ngb*CO under illumination at 15 K, showing the electron-density map contoured at 1.5σ. The occupancy of COA is 40%, whereas that of COB was estimated to be about 10%.

IUCrJ
Volume 6| Part 5| September 2019| Pages 832-842
ISSN: 2052-2525
https://doi.org/10.1107/S2052252519008157