FIG. 3.

Close-up of the FucO active site: stereo representation showing the binding sites of the iron metal (purple), the cofactor NAD⁺ (grey sticks), and the modeled substrate l-1,2-propanediol (green sticks). Carbon atoms are represented by grey balls, oxygen atoms are represented by red balls, and nitrogen atoms are represented by blue balls. For clarity, only the residues that coordinate the iron, the substrate, and the essential His267 residue are shown. The diagram was drawn with MOLSCRIPT (20).