SAH and the methyl groups of dimethylmalonate are modeled, based on the structures in Figure 2d,e. The pro(R) methyl of dimethylmalonate clashes with the Ile204 side chain. Metal ligands (His372, Gln459, and Gln464), Asn243, Ile204, and Tyr208 are colored according to the domain of origin (Figure 2c), dimethylmalonate with white C and SAH with magenta C, metal coordination bonds as solid black lines, hydrogen bonds as dashed green lines and the steric clash as dotted yellow lines.