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DNA sequence analysis revealed that the biosynthetic genes of the unusual beta-lactam antibiotic tabtoxin reside at the att site adjacent to the lysC tRNA gene in Pseudomonas syringae BR2. ORFs encoded within the region included ones with similarity to beta-lactam synthase and clavaminic acid synthase, as well as amino acid synthesis enzymes. Novel ORFs were present in a portion of the biosynthetic region associated with a toxin hypersensitivity phenotype. Tabtoxin resistance was associated with a fragment containing a major facilitator superfamily (MFS) transporter gene.


Thomas G Kinscherf, David K Willis. The biosynthetic gene cluster for the beta-lactam antibiotic tabtoxin in Pseudomonas syringae. The Journal of antibiotics. 2005 Dec;58(12):817-21

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PMID: 16506699

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