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. 2017 Sep 23;73(Pt 10):541–549. doi: 10.1107/S2053230X17013073

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© International Union of Crystallography 2017

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Nicotinamide-binding site of C. thermarum NDH-2. (a) A top view of the re face of the FAD isoalloxazine. The positions of both an FAD molecule (purple) and residues (yellow) involved in the nicotinamide-binding site are supported by an electron-density map shown as a grey mesh (2F _o − F _c map contoured at 1σ). (b) A view of (a) rotated by 60° clockwise. (c) The same view as in (a) but without the electron-density map. (d) The same view as in (b) but without the electron-density map. Phe165 is omitted in (a) and (c) for clarity. Potential hydrogen-bonding interactions are shown by dashed lines in (c) and (d).