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Comparison of the structures of the regulatory FG loop of BjFixLH in the unliganded “on” and cyanide bound “off” states. (A) The structure of the FG loop in the met-BjFixLH (brown) illustrating the hydrogen-bonding interactions (Left) and 2FO-FC electron density map (1σ) (Right). (B) Corresponding figure for cyanomet-BjFixLH (blue) showing hydrogen bonding (Left) and electron density (Right). (C) Stereoview of overlap of the refined models for both states.
