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Regulation of Pyruvate Formate Lyase-Deficient Klebsiella pneumoniae for Efficient 1,3-Propanediol Bioproduction

  • Wenjing Bao
  • Renquan Wei
  • Xuxia Liu
  • Shufan Dong
  • Tianyu Chen
  • Shuilin Fu
  • Heng GongEmail author
Article

Abstract

Anaerobic growth defect of pyruvate formate lyase (PFL)-deficient Klebsiella pneumoniae limits its industrial application, and the reason for this growth defect was analyzed in this study. The obtained evidences, combined with normal intracellular redox status and no further inhibition by adhE deletion, strongly suggested that growth defect in PFL-deficient K. pneumoniae was probably caused by lack of carbon flux from pyruvate to acetyl-CoA (AcCoA). Correspondingly, the anaerobic growth of PFL-deficient K. pneumoniae was promoted by deletion of pdhR, a negative transcriptional regulator gene for AcCoA generation. Through the regulation of pdhR deletion, the PFL-deficient K. pneumoniae exhibited highly efficient 1,3-propanediol production. Besides, in a 2-L fed-batch fermentation process, the cell growth of PFL-deficient K. pneumoniae strain almost recovered, when compared with that of the normal strain, and the 1,3-propanediol yield increased by 14%, while the byproducts acetate and 2,3-butanediol contents decreased by 29% and 24%, respectively.

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant No. 31271862.

Supplementary material

284_2019_1795_MOESM1_ESM.docx (15 kb)
Supplementary file1 (DOCX 15 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Wenjing Bao
    • 1
  • Renquan Wei
    • 1
  • Xuxia Liu
    • 1
  • Shufan Dong
    • 1
  • Tianyu Chen
    • 1
  • Shuilin Fu
    • 1
  • Heng Gong
    • 1
    Email author
  1. 1.State Key Laboratory of Bioreactor EngineeringEast China University of Science and TechnologyShanghaiPeople’s Republic of China

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