Dynamic Regulation Coupled with Metabolic Pathway Optimization Enables High-Efficiency Lacto- N -fucopentaose I Biosynthesis in Escherichia coli
Abstract
Lacto- N -fucopentaose I (LNFP I), the second most abundant fucosylated human milk oligosaccharide, plays important roles in infant health. In this study, we engineered an efficient Escherichia coli BL21star(DE3) cell factory for LNFP I production. The UDP-GlcNAc precursor pool was increased through glmS A overexpression, and a fructose-1,6-bisphosphate-responsive biosensor was implemented to dynamically regulate pfkA expression, thereby balancing cell growth with LNFP I biosynthesis. Transporter screening identified YhhS from E. coli as an effective exporter that enhanced LNFP I secretion. Strengthening carbon source utilization and optimizing the fermentation process enabled the development of a high-producing strain that achieved 3.50 g/L LNFP I in shake-flask fermentation and 68.10 g/L in a 5 L bioreactor, with an LNT-to-LNFP I conversion rate of 92.10% and a productivity of 0.87 g/L/h.
Fields of Study & Subjects
Infant Nutrition and Health
Glycosylation and Glycoproteins Research
Carbohydrate Chemistry and Synthesis
Publication details
- Journal / source
- Journal of Agricultural and Food Chemistry
- Publisher
- American Chemical Society (ACS)
- Volume
- 74
- Issue
- 16
- Pages
- 13031–13042
- Publication date
- 7 April 2026
- Language
- EN