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Applications of transposition mutagenesis in antibiotic producing streptomycetes

Abstract

Several transposons have been developed from the streptomycete insertion sequence IS493. They have broad host specificity in Streptomyces species and insert relatively randomly into a consensus target sequence of gNCaNTgNNy. Collectively, they have specialized features that facilitate the following: cloning of DNA flanking insertions; physical mapping of insertions; construction of highly stable mutants; and efficient construction of mutant libraries. All of the transposons can be introduced into streptomycetes by conjugation from E. coli, and can be delivered by curing the temperature sensitive delivery plasmid. Tn5099 was used to physically map genes involved in daptomycin and red pigment production in Streptomyces roseosporus, and to clone daptomycin biosynthetic genes. Tn5099 was also used in Streptomyces fradiae to identify and clone a neutral genomic site for the insertion of a second copy of the tylF gene. Recombinants containing two copies of the tylF gene carried out the no rmally rate limiting conversion of macrocin to tylosin very efficiently, thus causing substantial increases in tylosin yield.

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Baltz, R.H., McHenney, M.A., Cantwell, C.A. et al. Applications of transposition mutagenesis in antibiotic producing streptomycetes. Antonie Van Leeuwenhoek 71, 179–187 (1997). https://doi.org/10.1023/A:1000177808686

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  • daptomycin
  • IS493
  • Streptomyces
  • Tn5099
  • transposition
  • tylosin