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Efficient production of glutathione with multi-pathway engineering in Corynebacterium glutamicum

  • Wei Liu
  • Xiangcheng ZhuEmail author
  • Jiazhang Lian
  • Lei Huang
  • Zhinan XuEmail author
Metabolic Engineering and Synthetic Biology - Original Paper
  • 5 Downloads

Abstract

Glutathione is a bioactive tripeptide composed of glycine, l-cysteine, and l-glutamate, and has been widely used in pharmaceutical, food, and healthy products. The current metabolic studies of glutathione were mainly focused on the native producing strains with precursor amino acid supplementation. In the present work, Corynebacterium glutamicum, a workhorse for industrial production of a series of amino acids, was engineered to produce glutathione. First, the introduction of glutathione synthetase gene gshF from Streptococcus agalactiae fulfilled the ability of glutathione production in C. glutamicum and revealed that l-cysteine was the limiting factor. Then, considering the inherent capability of l-glutamate synthesis and the availability of external addition of low-cost glycine, l-cysteine biosynthesis was enhanced using a varieties of pathway engineering methods, such as disrupting the degradation pathways of l-cysteine and l-serine, and removing the repressor responsible for sulfur metabolism. Finally, the simultaneously introduction of gshF and enhancement of cysteine formation enabled C. glutamicum strain to produce glutathione greatly. Without external addition of l-cysteine and l-glutamate, 756 mg/L glutathione was produced. This is first time to demonstrate the potential of the glutathione non-producing strain C. glutamicum for glutathione production and provide a novel strategy to construct glutathione-producing strains.

Keywords

Glutathione gshF Corynebacterium glutamicum l-Cysteine 

Notes

Acknowledgements

This work was financially supported by National Natural Science Foundation of China (Nos. 21576232, 21606205 and 21808199), National Key Technology Research & Development Program of The Ministry of Science & Technology of China (2015BAD15B00), the Natural Science Foundation of Zhejiang Province (No. LY18B060002), and the Fundamental Research Funds for the Central Universities (2018QNA4039).

Supplementary material

10295_2019_2220_MOESM1_ESM.docx (1 mb)
Supplementary material 1 (DOCX 1052 kb)

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Copyright information

© Society for Industrial Microbiology and Biotechnology 2019

Authors and Affiliations

  1. 1.Key Laboratory of Biomass Chemical Engineering (Education Ministry), College of Chemical and Biological EngineeringZhejiang UniversityHangzhouChina
  2. 2.Xiangya International Academy of Translational MedicineCentral South UniversityChangshaChina
  3. 3.College of Chemical and Biological Engineering, Institute of Biological EngineeringZhejiang UniversityHangzhouChina
  4. 4.Center for Synthetic Biology, College of Chemical and Biological EngineeringZhejiang UniversityHangzhouChina

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