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Unraveling the specific regulation of the shikimate pathway for tyrosine accumulation in Bacillus licheniformis

  • Yinbiao Xu
  • Youran Li
  • Liang Zhang
  • Zhongyang Ding
  • Zhenghua Gu
  • Guiyang ShiEmail author
Metabolic Engineering and Synthetic Biology - Review

Abstract

l-Tyrosine serves as a common precursor for multiple valuable secondary metabolites. Synthesis of this aromatic amino acid in Bacillus licheniformis occurs via the shikimate pathway, but the underlying mechanisms involving metabolic regulation remain unclear. In this work, improved l-tyrosine accumulation was achieved in B. licheniformis via co-overexpression of aroGfbr and tyrAfbr from Escherichia coli to yield strain 45A12, and the l-tyrosine titer increased to 1005 mg/L with controlled glucose feeding. Quantitative RT-PCR results indicated that aroA, encoding DAHP synthase, and aroK, encoding shikimate kinase, were feedback-repressed by the end product l-tyrosine in the modified strain. Therefore, the native aroK was first expressed with multiple copies to yield strain 45A13, which could accumulate 1201 mg/L l-tyrosine. Compared with strain 45A12, the expression of aroB and aroF in strain 45A13 was upregulated by 21% and 27%, respectively, which may also have resulted in the improvement of l-tyrosine production. Furthermore, supplementation with 5 g/L shikimate enhanced the l-tyrosine titers of 45A12 and 45A13 by 29.1% and 24.0%, respectively. However, the yield of l-tyrosine per unit of shikimate decreased from 0.365 to 0.198 mol/mol after aroK overexpression in strain 45A12, which suggested that the gene product was also involved in uncharacterized pathways. This study provides a good starting point for further modification to achieve industrial-scale production of l-tyrosine using B. licheniformis, a generally recognized as safe workhorse.

Keywords

l-Tyrosine B. licheniformis Co-overexpression Quantitative RT-PCR Shikimate 

Notes

Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (2016YFD0401404), the National Natural Foundation of China (31401674), the National First-Class Discipline Program of Light Industry Technology and Engineering (LITE2018-22), the Qing Lan Project, and the Postgraduate Research & Practice Innovation Program of Jiangsu Provence (KYCX18_1796).

Supplementary material

10295_2019_2213_MOESM1_ESM.docx (548 kb)
Supplementary material 1 (DOCX 548 kb)

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Copyright information

© Society for Industrial Microbiology and Biotechnology 2019

Authors and Affiliations

  • Yinbiao Xu
    • 1
    • 2
    • 3
  • Youran Li
    • 1
    • 2
    • 3
  • Liang Zhang
    • 1
    • 2
    • 3
  • Zhongyang Ding
    • 1
    • 2
    • 3
  • Zhenghua Gu
    • 1
    • 2
    • 3
  • Guiyang Shi
    • 1
    • 2
    • 3
    Email author
  1. 1.Key Laboratory of Industrial Biotechnology, Ministry of Education, School of BiotechnologyJiangnan UniversityWuxiP. R. China
  2. 2.National Engineering Laboratory for Cereal Fermentation TechnologyJiangnan UniversityWuxiP. R. China
  3. 3.Jiangsu Provisional Research Center for Bioactive Product Processing TechnologyJiangnan UniversityWuxiP. R. China

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