Abstract
As one of the most powerful biosurfactants, surfactin has extensive application prospects in numerous industrial fields. Bacillus subtilis 168 was genetically modified to produce surfactin by increasing the supply of the precursor fatty acyl-CoA by overexpressing 4′ phosphopantetheinyl transferase, medium-chain acyl-acyl carrier protein (ACP) thioesterase and fatty acyl CoA ligase (encoded by sfp, bte, and yhfL, respectively), and knocking out acyl-CoA dehydrogenase (encoded by fadE). The resulting recombinant strain BSFX022 produced 2203 mg/L surfactin with xylose as carbon source. The lower accumulation of organic acids with xylose as carbon source made it possible to maintain surfactin production in a non-buffered fermentation system, and the yield reached 2074 mg/L. Furthermore, to reduce the costs, waste biomass such as corncob hydrolysate and monosodium glutamate wastewater (MGW) were used, and 2032 mg/L of surfactin was produced in the optimal waste-based medium. To our best knowledge, this is the first report of surfactin production using genetically modified Bacillus subtilis 168 with xylose as carbon source.
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This work was supported by the National Natural Science Foundation of China (No. 21576133) and the Jiangsu Synergetic Innovation Center for Advanced Bio-Manufacture.
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Hu, F., Liu, Y., Lin, J. et al. Efficient production of surfactin from xylose-rich corncob hydrolysate using genetically modified Bacillus subtilis 168. Appl Microbiol Biotechnol 104, 4017–4026 (2020). https://doi.org/10.1007/s00253-020-10528-9
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DOI: https://doi.org/10.1007/s00253-020-10528-9