Figure 8. Intermodular contacts between His 759 and residues in the AdoMet-binding reactivation module of MetH.
Nε2 of His759 interacts with the AdoMet module directly through a hydrogen bond to Asp1093 and via a water-mediated hydrogen bond to Glu1069. Nδ1 of His759 forms a hydrogen bond with the amide of the propionamide side chain of ring B of the cobalamin (not shown). Adapted from 20.