Abstract
Eicosapentaenoic acid (EPA) is a vital ɷ-3 polyunsaturated fatty acid (PUFA) for human body with various physiological functions. In this study, we proposed an adaptive evolutionary strategy based on high-temperature and high-oxygen two-factor stress to increase the EPA production capacity of Schizochytrium. High-temperature stress was used to increase EPA yield, and high oxygen was implemented to continuously stimulate cell growth and lipid accumulation. The biomass and EPA production of ALE-D50 reached 35.33 g/L and 1.54 g/L, which were 43.85% and 71.11% higher than that of the original strain, respectively. Lower in vivo reactive oxygen species levels indicated that the evolved strain possessed stronger antioxidant activity. Liquid chromatography–mass spectrometry metabolomics showed that enhanced glucose consumption and glycolysis metabolism, as well as a weakened tricarboxylic acid cycle and reduced amino acid metabolic tributaries in the evolved strain, might be associated with increased growth and EPA synthesis. Finally, the lipid production and EPA production in a fed-batch fermentation were further increased to 48.93 g/L and 3.55 g/L, improving by 54.30% and 90.86%, respectively. This study provides a novel pathway for promoting EPA biosynthesis in Schizochytrium.
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The datasets generated during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (Grant No. 2022YFC3401300), and the National Natural Science Foundation of China (Grant No. 32371540, 21878128).
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Ying Ou methodology, resources, formal analysis, investigation, and writing—original draft; Yu Qin formal analysis and investigation; Shoushuai Feng: conceptualization, funding acquisition, supervision, and writing—review & editing; Hailin Yang conceptualization, funding acquisition, supervision, and writing—review & editing.
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Ou, Y., Qin, Y., Feng, S. et al. Dual stress factors adaptive evolution for high EPA production in Schizochytrium sp. and metabolomics mechanism analysis. Bioprocess Biosyst Eng 47, 863–875 (2024). https://doi.org/10.1007/s00449-024-03013-4
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DOI: https://doi.org/10.1007/s00449-024-03013-4