Enhancing armeniaspirols production through multi-level engineering of a native Streptomyces producer

Résumé fourni par la source

Nature has provided unique molecular scaffolds for applications including therapeutics, agriculture, and food. Due to differences in ecological environments and laboratory conditions, engineering is often necessary to uncover and utilize the chemical diversity. Although we can efficiently activate and mine these often complex 3D molecules, sufficient production of target molecules for further engineering and application remain a considerable bottleneck. An example of these bioactive scaffolds are armeniaspirols, which are potent polyketide antibiotics against gram-positive pathogens and multi-resistance gram-negative Helicobacter pylori . Here, we examine upregulation of armeniaspirols through engineering of biosynthetic pathways and primary metabolism; including perturbation of genes in biosynthetic gene clusters and regulation for triacylglycerols pool towards armeniaspirol upregulation. With either overexpression of extender unit pathway or late-stage N -methylation, or the deletion of a competing polyketide cluster, we can achieve 7-49-fold upregulation of armeniaspirols production. The most significant upregulation was achieved by expression of heterologous fatty acyl-CoA synthase, where we observed not only a 97-fold increase in production yields compared to wild type, but also an increase in the diversity of observed armeniaspirol analogs.

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