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Figure 6
Possible electron-transfer routes from cytochrome to copper centres. (a) Wt RpNiR and (b) RpNiR–NO. The two adjacent monomers that form the catalytic centre are coloured magenta and cyan. Cu and Fe atoms are shown as blue and orange spheres, respectively, and water molecules as red small spheres. In the wt RpNiR structures two electron-transfer routes appear to be feasible: a through-bond electron-transfer route that leads to Tyr323 via Gly362 and water-mediated electron transfer to T1Cu via His143. In the ligand-bound structures the water-mediated electron-transfer route to T1Cu remains.

IUCrJ
Volume 5| Part 4| July 2018| Pages 510-518
ISSN: 2052-2525
https://doi.org/10.1107/S2052252518008242