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Noncanonical single module NRPS-like enzyme. (A) FsqF (A-T-R-PLP) in fumisoquin biosynthesis. PLP domain is fused with NRPS, catalyzing dehydration of serine and forming a new C-C bond with FsqD-activated tyrosine. (B) ATRR (A-T-R1-R2) in choline biosynthesis. Two consecutive R domains catalyze sequential reduction to convert betaine to choline.
