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Biosynthesis of fosfomycin, PTT, and dehydrophos. a, chemical structures of fosfomycin, PTT, and dehydrophos. b, the first three conversion steps catalyzed by PEP mutase, PnPy decarboxylase, and ADH. c, partial gene clusters of fosfomycin, PTT, and dehydrophos. Genes fom1, ppm, and dhpE encode for PEP mutase; fom2, ppd, and dhpF encode for PnPy decarboxylase; fomC, phpC and dhpG encode for ADH; and other encoded enzymes and the complete clusters were described elsewhere (12, 13).
