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We recently reported a novel class of amide bond forming enzymes (peptide ligases) involved in the biosynthesis of pheganomycins, resorcinomycins and ketomemicins. This class of enzymes exclusively utilizes Nα-amidino amino acids as the N-terminal substrate. In this Letter, we characterized three new amidinotransferases involved in the biosynthesis of ketomemicins and showed that l-arginine was the...