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Article Abstract

3'-Sialyllactose is a major sialylated human milk oligosaccharide that plays an important role in promoting infant development and supporting various physiological functions critical for early life. In this study, -acetylneuraminic acid and 3'-sialyllactose were successfully synthesized utilizing four genes across three modules through a whole-cell catalysis. Among these, Module III was employed to facilitate the conversion of cytidine-5'-monophosphate to cytidine 5'-triphosphate utilizing the intrinsic enzyme system of . This study presents the inaugural report demonstrating the synergistic synthesis of 3'-sialyllactose through three modules derived from and , utilizing pyruvate, -acetylglucosamine, lactose, and cytidine-5'-monophosphate as substrates. The induction and the whole-cell catalytic substrate dosage of the engineered JM109(DE3) were optimized, leading to a 3'-sialyllactose titer of 71.62 g/L. Ultimately, the strain underwent culture and whole-cell catalysis in a 5 L bioreactor, achieving a maximum titer of 78.03 g/L for 3'-sialyllactose.

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http://dx.doi.org/10.1021/acs.jafc.5c04764DOI Listing

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