Microbes encode many uncharacterized gene clusters that may produce antibiotics and other bioactive small molecules. Methods for activating these genes are needed to explore their biosynthetic potential. A transposon containing an inducible promoter was randomly inserted into the genome of the soil bacterium Burkholderia thailandensis in order to induce antibiotic expression. This screen identified the polyketide/non-ribosomal peptide thailandamide as an antibiotic and discovered its regulator, AtsR. Mutants of Salmonella resistant to thailandamide had mutations in the accA gene for acetyl-CoA carboxylase, which is one of the first enzymes in the fatty acid synthesis pathway. A second copy of accA in the thailandamide synthesis gene cluster keeps B. thailandensis resistant to its own antibiotic. These genetic techniques will likely be powerful tools for discovering other unusual antibiotics.
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