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NRPS-catalyzed O-methylation. (A) Structure of a representative of the cyclic NRP kutznerides. (B) Role of KtzH in the incorporation of methylated amino acids through A domain-catalyzed activation and loading of l-Ser followed by M domain-catalyzed O-methylation. AdoMet, S-adenosyl-l-methionine; SAH, S-adenosyl-l-homocysteine.
