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Biosynthesis of mycobactin. A. Organization of the mbt genes in the mbt-1 and mbt-2 loci and the location of the IdeR boxes. B. Biosynthetic pathway of mycobactin (5) with the first two steps catalyzed by MbtI and MbtA followed by the reaction carried out by the megasynthase complex and then derivatization of the lysine molecule. Chorismate (1), isochorismate (2), salicyclic acid (3) and salicyl adenylate intermediate (4).
