Biotechnology Bulletin ›› 2022, Vol. 38 ›› Issue (6): 93-102.doi: 10.13560/j.cnki.biotech.bull.1985.2021-1058

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Pathway Engineering Modification of Corynebacterium glutamicum for Shikimic Acid Production

NIE Li-bin1,2(), YI Ling-xin1,2, DENG Yan1,2, SHENG Qi1,2, WU Xiao-yu1,2, ZHANG Bin1,2()   

  1. 1. College of Bioscience and Bioengineering,Jiangxi Agricultural University,Nanchang 330045
    2. Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources,Jiangxi Agricultural University,Nanchang 330045
  • Received:2021-08-18 Online:2022-06-26 Published:2022-07-11
  • Contact: ZHANG Bin E-mail:857693610@qq.com;zhangbin2919@jxau.edu.cn

Abstract:

Shikimic acid,as an intermediate metabolite of aromatic family,is the precursor of oseltamivir phosphate for the synthesis of an anti-avian influenza drug. Currently,the production of shikimic acid mainly depends on the plant extraction method with shortcoming in high cost and long period. Due to the advantages in low production cost and short period,microbial fermentation for the synthesis of shikimic acid has turned into the hot spot of research. In order to construct a recombinant C. glutamicum capable of producing shikimic acid,the metabolic pathways of shikimic acid in C. glutamicum was modified via metabolic engineering at genetic level. The yield of shikimic acid significantly increased by blocking the catabolic pathway,relieving the feedback inhibition,and blocking the competitive metabolic pathway. The final strain C. glutamicum SKA06 produced 7.61 g/L of shikimic acid during 72 h shake flask cultivation,which was 68 times higher than that of the original strain. Moreover,genetic modification based on chromosome engineering overcame the problems of unstable passage and antibiotics addition caused by the introduction of plasmid,which may provide important reference for the development of shikimic acid producing strains.

Key words: Corynebacterium glutamicum, shikimic acid, promoter engineering, pathway engineering