High-yield production of 1,3-propanediol from glycerol by metabolically engineered Klebsiella pneumoniae

Jung-hyun Lee, Moo Young Jung, Min-Kyu Oh

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Background: Glycerol is a major byproduct of the biodiesel industry and can be converted to 1,3-propanediol (1,3-PDO) by microorganisms through a two-step enzymatic reaction. The production of 1,3-PDO from glycerol using microorganisms is accompanied by formation of unwanted byproducts, including lactate and 2,3-butanediol, resulting in a low-conversion yield. Results: Klebsiella pneumoniae was metabolically engineered to produce high-molar yield of 1,3-PDO from glycerol. First, the pathway genes for byproduct formation were deleted in K. pneumoniae. Then, glycerol assimilation pathways were eliminated and mannitol was co-fed to the medium. Finally, transcriptional regulation of the dha operon were genetically modified for enhancing 1,3-propanediol production. The batch fermentation of the engineered strain with co-feeding of a small amount of mannitol yielded 0.76 mol 1,3-PDO from 1 mol glycerol. Conclusions: Klebsiella pneumoniae is useful microorganism for producing 1,3-PDO from glycerol. Implemented engineering in this study successfully improved 1,3-PDO production yield, which is significantly higher than those reported in previous studies.

Original languageEnglish
Article number104
JournalBiotechnology for Biofuels
Volume11
Issue number1
DOIs
Publication statusPublished - 2018 Apr 9

Keywords

  • 1, 3-PDO
  • Byproducts
  • Co-substrate
  • dha operon
  • Glycerol
  • Glycerol assimilation pathway
  • Klebsiella pneumoniae
  • Mannitol

ASJC Scopus subject areas

  • Biotechnology
  • Applied Microbiology and Biotechnology
  • Renewable Energy, Sustainability and the Environment
  • Energy(all)
  • Management, Monitoring, Policy and Law

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