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- W4308998145 abstract "Abstract N ‐acetylneuraminic acid (NeuAc), which has been widely used as a nutraceutical and pharmaceutical intermediate, plays an important role in improving brain development and cognition while enhancing immunity. Bacillus subtilis , generally regarded as a food‐safe microorganism, is suitable for developing as a chassis cell for efficient NeuAc synthesis. However, accumulated intermediates can lead to metabolic bottlenecks for NeuAc synthesis. To eliminate the accumulated byproduct N ‐acetylglucosamine (GlcNAc), the UDP‐GlcNAc epimerase pathway without GlcNAc production was first reconstructed and optimized in B. subtilis , resulting in the NeuAc titer increase of 5.9 g/L with GlcNAc elimination. In addition, to reduce another accumulated byproduct N ‐acetylmannosamine (ManNAc), the directed evolution of N ‐acetylneuraminic acid synthase and the enhancement of phosphoenolpyruvate supply was implemented. Using this strategy, ManNAc decreased by 46.3%, and the NeuAc titer increased by 54.9%, reaching 7.9 g/L. Finally, the maximum titer of NeuAc in a 3‐L fermenter reached 21.8 g/L with a productivity of 0.34 g/L/h." @default.
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- W4308998145 date "2022-11-14" @default.
- W4308998145 modified "2023-10-05" @default.
- W4308998145 title "Improved <i>N</i>‐acetylneuraminic acid bioproduction by optimizing pathway for reducing intermediate accumulation" @default.
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- W4308998145 doi "https://doi.org/10.1002/fbe2.12030" @default.
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