Engineering of Serine-Deamination pathway, Entner-Doudoroff pathway and pyruvate dehydrogenase complex to improve poly(3-hydroxybutyrate) production in Escherichia coli

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• 作者：Yan Zhang (1) (2) (3) (5)
  Zhenquan Lin (1) (2) (3) (5)
  Qiaojie Liu (1) (2) (3) (5)
  Yifan Li (1) (2) (3) (5)
  Zhiwen Wang (1) (2) (3) (5)
  Hongwu Ma (4)
  Tao Chen (1) (2) (3) (5)
  Xueming Zhao (1) (2) (3) (5)
  
  1. Key Laboratory of Systems Bioengineering (Ministry of Education) ; Tianjin University ; Tianjin ; 300072 ; People鈥檚 Republic of China
  2. SynBio Research Platform ; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) ; School of Chemical Engineering and Technology ; Tianjin University ; Tianjin ; 300072 ; People鈥檚 Republic of China
  3. Edinburg-Tianjin Joint Research Centre for Systems Biology and Synthetic Biology ; Tianjin University ; Tianjin ; 300072 ; People鈥檚 Republic of China
  5. Department of Biochemical Engineering ; School of Chemical Engineering and Technology ; Tianjin University ; Tianjin ; 300072 ; China
  4. Key Laboratory of Systems Microbial Biotechnology ; Tianjin Institute of Industrial Biotechnology ; Chinese Academy of Sciences ; Tianjin ; 300308 ; People鈥檚 Republic of China
  
• 关键词：Escherichia coli ; poly(3 ; hydroxybutyrate) ; L ; serine deaminate ; Entner ; Doudoroff pathway ; Pyruvate dehydrogenase complex
• 刊名：Microbial Cell Factories
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：13
• 期：1
• 全文大小：603 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Biotechnology
  Applied Microbiology
  Environmental Engineering/Biotechnology
  
• 出版者：BioMed Central
• ISSN：1475-2859

文摘

Background Poly(3-hydroxybutyrate) (PHB), a biodegradable bio-plastic, is one of the most common homopolymer of polyhydroxyalkanoates (PHAs). PHB is synthesized by a variety of microorganisms as intracellular carbon and energy storage compounds in response to environmental stresses. Bio-based production of PHB from renewable feedstock is a promising and sustainable alternative to the petroleum-based chemical synthesis of plastics. In this study, a novel strategy was applied to improve the PHB biosynthesis from different carbon sources. Results In this research, we have constructed E. coli strains to produce PHB by engineering the Serine-Deamination (SD) pathway, the Entner-Doudoroff (ED) pathway, and the pyruvate dehydrogenase (PDH) complex. Firstly, co-overexpression of sdaA (encodes L-serine deaminase), L-serine biosynthesis genes and pgk (encodes phosphoglycerate kinase) activated the SD Pathway, and the resulting strain SD02 (pBHR68), harboring the PHB biosynthesis genes from Ralstonia eutropha, produced 4.86 g/L PHB using glucose as the sole carbon source, representing a 2.34-fold increase compared to the reference strain. In addition, activating the ED pathway together with overexpressing the PDH complex further increased the PHB production to 5.54 g/L with content of 81.1% CDW. The intracellular acetyl-CoA concentration and the [NADPH]/[NADP+] ratio were enhanced after the modification of SD pathway, ED pathway and the PDH complex. Meanwhile, these engineering strains also had a significant increase in PHB concentration and content when xylose or glycerol was used as carbon source. Conclusions Significant levels of PHB biosynthesis from different kinds of carbon sources can be achieved by engineering the Serine-Deamination pathway, Entner-Doudoroff pathway and pyruvate dehydrogenase complex in E. coli JM109 harboring the PHB biosynthesis genes from Ralstonia eutropha. This work demonstrates a novel strategy for improving PHB production in E. coli. The strategy reported here should be useful for the bio-based production of PHB from renewable resources.