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Figure 2
Heme sites with 2Fo − Fc electron or nuclear density maps contoured at 1σ for (a) the neutron structure and (b) the X-ray structure from the same crystal after the neutron structure had been obtained. Note the presence of a PEG molecule at the heme distal site in both cases. (c) Serial Laue structure showing a 5c site. (d) XFEL structure of DHP-B protomer B. (e) The synchrotron serial crystallography (SSX) structure. Note the distal water molecule coordinating the heme iron at the axial position. (f) Superposition of the nonhemichrome heme site for the different structures in this work. NX structure, orange; NX-Xray structure, red; SFX structure, blue; SSX structure, turquoise; SLX structure, grey.

IUCrJ
Volume 9| Part 5| September 2022| Pages 610-624
ISSN: 2052-2525
https://doi.org/10.1107/S2052252522006418