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Ubiquinone and menadione docking at the quinone-binding site (Q-site) of NDH-2. (a) The docked ubiquinone in the Q-site, viewed from the si face of an FAD isoalloxazine. (b) A view of (a) rotated by 90° clockwise. (c) The docked menadione in the Q-site. (d) A view of (c) rotated by 90° clockwise. Potential hydrogen-bonding interactions are shown by dashed lines in (b) and (d).
