Enhancement of UDPG synthetic pathway improves ansamitocin production in Actinosynnem pretiosum

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• 作者：Yuxiang Fan ; Mengjiang Zhao ; Liujing Wei…
• 关键词：Actinosynnema pretiosum ; Ansamitocins ; UDPG synthetic pathway ; Metabolic engineering
• 刊名：Applied Microbiology and Biotechnology
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：100
• 期：6
• 页码：2651-2662
• 全文大小：634 KB
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• 作者单位：Yuxiang Fan (1)
  Mengjiang Zhao (1)
  Liujing Wei (1)
  Fengxian Hu (1)
  Tadayuki Imanaka (1)
  Linquan Bai (2)
  Qiang Hua (1) (3)
  
  1. State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China
  2. State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
  3. Shanghai Collaborative Innovation Center for Biomanufacturing Technology (SCICBT), 130 Meilong Road, Shanghai, 200237, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  Microbiology
  Microbial Genetics and Genomics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0614

文摘

Ansamitocin P-3 (AP-3), an amacrocyclic lactam compound, is produced by Actinosynnema pretiosum. As a group of maytansinoid antibiotics, ansamitocins have an extraordinary antitumor activity by blocking the assembly of tubulin forming into functional microtubules. The biosynthesis of ansamitocins is initialized by the formation of UDP-glucose (UDPG) which is converted from glucose-1-phosphate (G1P). In this study, we focused on the influence of enhancement of UDPG biosynthesis on the production of ansamitocins in A. pretiosum. The homologous overexpressions of phosphoglucomutase, starch phosphorylase, and UTP-G1P uridylyltransferase, respectively, could largely increase the pool sizes of G1P and UDPG and result in improved AP-3 production. The elevated intracellular glucose-6-phosphate (G6P) level provided by the enhanced glyconeogenesis had, however, no significant effects on the biosynthesis of AP-3. The G6P-G1P-UDPG pathway was therefore systematically engineered by multiple genetic modifications, and a significant increase in AP-3 production was achieved (168 mg/L of AP-3 in flask culture, 40 % higher than the control strain). We also found that the enhancement of starch assimilation pathway could also improve the assembly of AP-3 to some extent. In addition, heterologous gene overexpression from Actinosynnema mirum could result in more AP-3 biosynthesis in comparison to the corresponding homologous overexpression, suggesting an alternative and promising avenue of metabolic engineering strategy for improving AP-3 production.