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High-yield anthocyanin biosynthesis in engineered Escherichia coli.

Yajun Yan1, Zhen Li, Mattheos A G Koffas

  • 1Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, 904 Furnas Hall, Buffalo, New York 14260, USA.

Biotechnology and Bioengineering
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Area of Science:

  • Metabolic Engineering
  • Synthetic Biology
  • Biochemistry

Background:

  • Anthocyanins are plant pigments with significant antioxidant and anti-inflammatory properties.
  • Extensive research highlights their potential in treating various chronic diseases.
  • Efficient and scalable production methods are crucial for their pharmaceutical and nutraceutical applications.

Purpose of the Study:

  • To construct a metabolic pathway for anthocyanin biosynthesis in Escherichia coli.
  • To characterize anthocyanin biosynthetic enzymes for pathway engineering.
  • To optimize microbial production of key anthocyanins from inexpensive precursors.

Main Methods:

  • Enzyme characterization and heterologous expression in E. coli.
  • Metabolic pathway construction using flavanone and flavan-3-ol precursors.
  • Optimization strategies including pH adjustment, fusion protein creation, and metabolic network manipulation.
  • Enhancement of UDP-glucose supply and product stabilization.

Main Results:

  • Recombinant E. coli produced pelargonidin 3-O-glucoside and cyanidin 3-O-glucoside from flavanone precursors.
  • Higher yields of cyanidin 3-O-glucoside were achieved from (+)-catechin precursor.
  • Optimized production reached 78.9 mg/L for pelargonidin 3-O-glucoside and 70.7 mg/L for cyanidin 3-O-glucoside from flavan-3-ols.
  • Identified UDP-glucose availability and product instability as key limitations.

Conclusions:

  • Demonstrated efficient microbial production of core anthocyanins.
  • Overcame metabolic limitations and product instability challenges.
  • Opened possibilities for commercialization of anthocyanins for pharmaceutical and nutraceutical uses.