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Figure 2
(a) 2Fo–Fc electron-density map contoured at 1σ for the damage-free SFX structure of DtpAa at 1.88 Å resolution, showing the clear and well resolved water network within the heme pocket. Water molecules interact extensively with the pocket residue Asp239 as well as with Arg369 (omitted for clarity). (b) Superposition of the SFX structure (blue) with the 32.8 kGy SSX structure (red). Small changes to the heme-pocket water network are apparent even at this low dose.

IUCrJ
Volume 6| Part 4| July 2019| Pages 543-551
ISSN: 2052-2525
https://doi.org/10.1107/S2052252519003956