Abstract
Daptomycin is a cyclic lipopeptide antibiotic produced by Streptomyces roseosporus. Cubicin® (daptomycin-for-injection) was approved in 2003 by the FDA to treat skin and skin structure infections caused by Gram-positive pathogens. Daptomycin is particularly significant in that it represents the first new natural product antibacterial structural class approved for clinical use in three decades. The daptomycin gene cluster contains three very large genes (dptA, dptBC, and dptD) that encode the nonribosomal peptide synthetase (NRPS). The related cyclic lipopeptide A54145 has four NRPS genes (lptA, lptB, lptC, and lptD), and calcium dependent antibiotic (CDA) has three (cdaPS1, cdaPS2, and cdaPS3). Mutants of S. roseosporus containing deletions of one or more of the NRPS genes have been trans-complemented with dptA, dptBC, and dptD by inserting these genes under the control of the ermEp* promoter into separate conjugal cloning vectors containing ϕC31 or IS117 attachment (attP int) sites; delivering the plasmids into S. roseosporus by conjugation from Escherichia coli; and inserting the plasmids site-specifically into the chromosome at the corresponding attB sites. This trans-complementation system was used to generate subunit exchanges with lptD and cdaPS3 and the recombinants produced novel hybrid molecules. Module exchanges at positions d-Ala8 and d-Ser11 in the peptide have produced additional novel derivatives of daptomycin. The approaches of subunit exchanges and module exchanges were combined with amino acid modifications of Glu at position 12 and natural variations in lipid side chain starter units to generate a combinatorial library of antibiotics related to daptomycin. Many of the engineered strains produced levels of novel molecules amenable to isolation and antimicrobial testing, and most of the compounds displayed antibacterial activities.
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Acknowledgements
We thank Cubist pharmaceuticals for supporting this work. We are indebted to Frank Tally, Barry Eisenstein, Skip Shimer, Dennis Keith, and Jeff Alder for providing support for this project at various stages of development.
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Baltz, R.H., Brian, P., Miao, V. et al. Combinatorial biosynthesis of lipopeptide antibiotics in Streptomyces roseosporus . J IND MICROBIOL BIOTECHNOL 33, 66–74 (2006). https://doi.org/10.1007/s10295-005-0030-y
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DOI: https://doi.org/10.1007/s10295-005-0030-y