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Proposed pathway of thaxtomin A biosynthesis in S. acidiscabies 84.104. Central reactions catalyzed by TxtAB, and consecutive TxtC-catalyzed hydroxylations are shown. Cofactors and accessory proteins are not shown. Initial sequences catalyzing l-Trp nitration are not known. For simplicity, it is assumed that l-4-NO2-Trp is the substrate for the TxtAB peptide synthetase.
