Increased Production of Colanic Acid by an Engineered Escherichia coli Strain, Mediated by Genetic and Environmental Perturbations

Eun Ju Yun, Yoonho Cho, Na Ree Han, In Jung Kim, Yong Su Jin, Kyoung Heon Kim

Research output: Contribution to journalArticlepeer-review

Abstract

Colanic acid (CA) is a major exopolysaccharide synthesized by Escherichia coli that serves as a constituent of biofilm matrices. CA demonstrates potential applications in the food, cosmetics, and pharmaceutical industry. Moreover, l-fucose, a monomeric constituent of CA, exhibits various physiological activities, such as antitumor, anti-inflammatory, and skin-whitening. Here, the effects of genetic and environmental perturbations were investigated for improving CA production by E. coli. When rcsF, a positive regulator gene of CA synthesis, was expressed in E. coli ΔwaaF, a CA-producing strain constructed previously, the CA titer increased to 3051.2 mg/L as compared to 2052.8 mg/L observed with E. coli ΔwaaF. Among the environmental factors tested, namely, osmotic and oxidative stresses and pH, pH was a primary factor that significantly improved CA production. When the pH of the culture medium of E. coli ΔwaaF + rcsF was maintained at 7, the CA titer significantly increased to 4351.6 mg/L. The CA yield obtained with E. coli ΔwaaF + rcsF grown at pH 7 was 5180.4 mg CA/g dry cell weight, which is the highest yield of CA reported so far. This engineered E. coli system with optimization of environmental conditions can be employed for fast and economically-feasible production of CA.

Original languageEnglish
JournalApplied Biochemistry and Biotechnology
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • Colanic acid
  • Environmental perturbation
  • Escherichia coli
  • Exopolysaccharide
  • rcsF
  • waaF

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biochemistry
  • Applied Microbiology and Biotechnology
  • Molecular Biology

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