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. 2021 Jan 1;7(1):eabd8523. doi: 10.1126/sciadv.abd8523

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Fig. 2 — (A) N^δ1 atom of His_CAT in as-isolated Br^2DNiR SRX (green) v SF-ROX (cyan) structures, both forming a strong hydrogen bond with main-chain O atom of Glu²⁷⁴. (B) His_CAT in nitrite-bound Br^2DNiR SRX (orange) v SF-ROX (magenta) structures; N^δ1 atom of His_CAT forms a strong hydrogen bond with main-chain O atom of Glu²⁷⁴ in nitrite-bound SF-ROX structure but is rotated in nitrite-bound SRX structure to form a new hydrogen bond with O^γ1 of Thr²⁷⁵. (C) N^δ1 atom of His_CAT in NO-bound/T1Cu-reduced Br^2DNiR SRX (white) v SF-ROX (purple) structures forms a strong hydrogen bond with main-chain O atom of Glu²⁷⁴. (D) Superimposition of all Br^2DNiR structures, His_CAT rotation and change in hydrogen bond position, is only observed in atomic-resolution SRX nitrite-bound structure.