6TFO:
reference: Structures of substrate- and product-bound forms of a multi-domain copper nitrite reductase shed light on the role of domain tethering in protein complexes., Sasaki D, Watanabe TF, Eady RR, Garratt RC, Antonyuk SV, Hasnain SS, IUCrJ. 2020 Apr 25;7(Pt 3):557-565. doi: 10.1107/S2052252520005230. eCollection, 2020 May 1. PMID: 32431838

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