Milbemycin is effective against some avermectin-resistant insects.[2]
Biosynthesis
Like avermectins, milbemycins are products of fermentation by Streptomyces species. A grand total of five species, namely S. hygroscopicus, S. griseochromogenes, S. cyaneogriseus, S. nanchanggensis and S. bingchenggensis, are known to produce this family of compounds.[2]
The biosynthetic cluster from S. bingchenggensis and S. nanchanggensis have been sequenced and analyzed, partly by analogy to the homologous biosynthetic cluster for avermectin. New regulatory elements that control how much milbemycins are being identified in hopes to improve the industrial fermentation yield of milbemycins, which (as of 2021) is much lower than that of avermectin.[2]
An alternative pathway to higher yields was demonstrated in 2017, when select genes from S. avermitilis were swapped out so the avermectin producer makes milbemycin instead.[2]
Examples
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^ abcdYan, YS; Xia, HY (December 2021). "Recent advances in the research of milbemycin biosynthesis and regulation as well as strategies for strain improvement". Archives of Microbiology. 203 (10): 5849–5857. doi:10.1007/s00203-021-02575-1. PMID34550409. S2CID237594779.