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. 2019 Jan 28;75(Pt 2):211–218. doi: 10.1107/S2059798319000317

Figure 3.

Figure 3

The two [4Fe–4S] clusters (ball-and-stick representation) in ferredoxin; the 2mF obs − DF calc (blue, 1.0σ) and F obs − DF calc (green, 2.5σ) electron-density maps show indications of reproducible, localized radiation damage to heavy-atom centres in protein crystals exposed to intense XFEL radiation. The two clusters show different levels of damage, indicating that the local environment may play a role in radiation-damage dynamics at XFELs. The effects at photon energies of 7.36 and 6.86 keV (above and below the Fe K absorption edge) on the reconstructed electron-density maps of the [4Fe–4S] clusters are similar. Reproduced from Nass et al. (2015 ▸).