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NAD+ binding site. (A) Stereo view of the Fo-Fc OMIT map of NAD+ in the FucO subunit. The density is well defined for the adenine moiety, whereas the electron density of the nicotinamide ring is weaker. The diagrams were drawn with BOBSCRIPT (15). (B) Comparison of the orientation of the nicotinamide ring in the FucO (blue cofactor) and TM0920 (red cofactor) active centers.
