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Figure 4
Comparison of the T1Cu copper site in wtRpNiR and Met148Leu RpNiR, and its electron transfer route. (A) Details of the T1Cu site of the Met148Leu RpNiR structure and (B) a superposition of wtRpNiR (3ziy) and Met148Leu. RpNiR shows the movement of T1Cu in Met148Leu RpNiR towards the His143 due to the loss of the axial ligand upon mutation. (C) Electron transfer route of Met148Leu from the haem to T1Cu, and T2Cu. The Met148Leu is shown in orange, and the wild type is shown in blue. The 2Fo − Fc electron-density map is shown as a grey mesh at the 1σ level. T1Cu is shown as a deep blue sphere and a brown sphere for Met148Leu and wild type, respectively. The red dashed lines represent coordination bonds of the copper sites.

IUCrJ
Volume 13| Part 4| July 2026|
ISSN: 2052-2525
https://doi.org/10.1107/S2052252526004549