Fig. 4.
Schematic representation of biosynthesis of a halogenated threonyl-moiety in the biosynthetic pathway of the NRP syringomycin E. The threonyl moiety is tethered to the peptidyl-carrier protein domain (T) in the two-domain protein SyrB1 via a phosphopantetheinly arm. Holo-SyrB1 is then used as a substrate for the halogenase SyrB2.
Adapted from Vaillancourt [20].