Integrated Optimization of the In Vivo Heme Biosynthesis Pathway and the In Vitro Iron Concentration for 5-Aminolevulinate Production

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• 作者：Junli Zhang ; Zhen Kang ; Wenwen Ding ; Jian Chen…
• 关键词：5 ; Aminolevulinic acid ; Escherichia coli ; Heme ; Iron ; RyhB
• 刊名：Applied Biochemistry and Biotechnology
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：178
• 期：6
• 页码：1252-1262
• 全文大小：446 KB
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• 作者单位：Junli Zhang (1) (2) (3)
  Zhen Kang (1) (2) (3)
  Wenwen Ding (1) (2) (3)
  Jian Chen (2) (3)
  Guocheng Du (2) (4)
  
  1. The Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China
  2. School of Biotechnology, Jiangnan University, Wuxi, 214122, China
  3. Synergetic Innovation Center of Food Safety and Nutrition, Jiangnan University, Wuxi, Jiangsu, 214122, China
  4. The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  Biochemistry
  
• 出版者：Humana Press Inc.
• ISSN：1559-0291

文摘

5-Aminolevulinic acid (ALA) is a nonprotein amino acid that has been widely used in many fields. In this study, we developed a new process for ALA production by optimizing the in vivo heme biosynthesis pathway and the iron concentration during cultivation. With the addition of iron, co-overexpression of the heme synthesis pathway genes hemA, hemL, hemF, and hemD significantly increased the accumulation of ALA and cell biomass. Further experiments demonstrated that the increased ALA accumulation resulted from moderate repression of ALA dehydratase (encoded by hemB), which was caused by hemF overexpression. After the addition of an optimized concentration (7.5 mg/L) of iron, ALA production by the recombinant Escherichia coli LADF-6 strain that overexpressed hemA, hemL, hemD, and hemF increased to 2840 mg/L in flask cultures. After applying a batch fermentation strategy, the ALA concentration increased to 4.05 g/L, with a productivity of 0.127 g/L·h. The results showed that the moderate repression of the in vivo heme pathway enzyme ALA dehydratase and the simultaneous optimization of the in vitro iron ion concentration served to increase the production of ALA and cell biomass.