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Construction of ivermectin producer by domain swaps of avermectin polyketide synthase in Streptomyces avermitilis

  • Applied Genetics and Molecular Biotechnology
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Abstract

Ivermectin, 22, 23-dihydroavermectin B1, is commercially important in human, veterinary medicine, and pesticides. It is currently synthesized by chemical reduction of the double bond between C22 and C23 of avermectins B1, which are a mixture of B1a (>80%) and B1b (<20%) produced by fermentation of Streptomyces avermitilis. The cost of ivermectin is much higher than that of avermectins B1 owing to the necessity of region-specific hydrogenation at C22–C23 of avermectins B1 with rhodium chloride as the catalyst for producing ivermectin. Here we report that ivermectin can be produced directly by fermentation of recombinant strains constructed through targeted genetic engineering of the avermectin polyketide synthase (PKS) in S. avermitilis Olm73-12, which produces only avermectins B and not avermectins A and oligomycin. The DNA region encoding the dehydratase (DH) and ketoreductase (KR) domains of module 2 from the avermectin PKS in S. avermitilis Olm73-12 was replaced by the DNA fragment encoding the DH, enoylreductase, and KR domains from module 4 of the pikromycin PKS of Streptomyces venezuelae ATCC 15439 using a gene replacement vector pXL211. Twenty-seven of mutants were found to produce a small amount of 22, 23-dihydroavermectin B1a and avermectin B1a and B2a by high performance liquid chromatography and liquid chromatography mass spectrometry analysis. This study might provide a route to the low-cost production of ivermectin by fermentation.

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Acknowledgements

We thank Dr. Huarong Tan (Institute of Microbiology, Chinese Academy of Sciences) for giving us the plasmid pKC1139 and for valuable comments on the manuscript. This work was supported by grants from National Basic Research Project (Grant No. 2003CH114205) and National High Technology Research and Development Program (Grant No. 2001AA214071).

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Correspondence to Jilun Li.

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Zhang, X., Chen, Z., Li, M. et al. Construction of ivermectin producer by domain swaps of avermectin polyketide synthase in Streptomyces avermitilis . Appl Microbiol Biotechnol 72, 986–994 (2006). https://doi.org/10.1007/s00253-006-0361-2

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