Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Improved Production of Long-Chain Fatty Acid in Escherichia coli by an Engineering Elongation Cycle During Fatty Acid Synthesis (FAS) Through Genetic Manipulation

  • Jeon, Eunyoung (Department of Chemical and Biomolecular Engineering, Sogang University) ;
  • Lee, Sunhee (Department of Chemical and Biomolecular Engineering, Sogang University) ;
  • Lee, Seunghan (Department of Chemical and Biomolecular Engineering, Sogang University) ;
  • Han, Sung Ok (School of Life Science and Biotechnology, Korea University) ;
  • Yoon, Yeo Joon (Department of Chemistry and Nano Science, Ewha Womans University) ;
  • Lee, Jinwon (Department of Chemical and Biomolecular Engineering, Sogang University)
  • Received : 2011.12.22
  • Accepted : 2012.03.11
  • Published : 2012.07.28
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Abstract

The microbial biosynthesis of fatty acid of lipid metabolism, which can be used as precursors for the production of fuels of chemicals from renewable carbon sources, has attracted significant attention in recent years. The regulation of fatty acid biosynthesis pathways has been mainly studied in a model prokaryote, Escherichia coli. During the recent period, global regulation of fatty acid metabolic pathways has been demonstrated in another model prokaryote, Bacillus subtilis, as well as in Streptococcus pneumonia. The goal of this study was to increase the production of long-chain fatty acids by developing recombinant E. coli strains that were improved by an elongation cycle of fatty acid synthesis (FAS). The fabB, fabG, fabZ, and fabI genes, all homologous of E. coli, were induced to improve the enzymatic activities for the purpose of overexpressing components of the elongation cycle in the FAS pathway through metabolic engineering. The ${\beta}$-oxoacyl-ACP synthase enzyme catalyzed the addition of acyl-ACP to malonyl-ACP to generate ${\beta}$-oxoacyl-ACP. The enzyme encoded by the fabG gene converted ${\beta}$-oxoacyl-ACP to ${\beta}$-hydroxyacyl-ACP, the fabZ catalyzed the dehydration of ${\beta}$-3-hydroxyacyl-ACP to trans-2-acyl-ACP, and the fabI gene converted trans-2-acyl-ACP to acyl-ACP for long-chain fatty acids. In vivo productivity of total lipids and fatty acids was analyzed to confirm the changes and effects of the inserted genes in E. coli. As a result, lipid was increased 2.16-fold higher and hexadecanoic acid was produced 2.77-fold higher in E. coli JES1030, one of the developed recombinants through this study, than those from the wild-type E. coli.

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References

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