Pathway engineering of Enterobacter aerogenes to improve acetoin production by reducing by-products formation

Ji Woong Jang, Hwi Min Jung, Dae Kyun Im, Moo Young Jung, Min-Kyu Oh

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Enterobacter aerogenes was metabolically engineered for acetoin production. To remove the pathway enzymes that catalyzed the formation of by-products, the three genes encoding a lactate dehydrogenase (ldhA) and two 2,3-butanediol dehydrogenases (budC, and dhaD), respectively, were deleted from the genome. The acetoin production was higher under highly aerobic conditions. However, an extracellular glucose oxidative pathway in E. aerogenes was activated under the aerobic conditions, resulting in the accumulation of 2-ketogluconate. To decrease the accumulation of this by-product, the gene encoding a glucose dehydrogenase (gcd) was also deleted. The resulting strain did not produce 2-ketogluconate but produced significant amounts of acetoin, with concentration reaching 71.7 g/L with 2.87 g/L/h productivity in fed-batch fermentation. This result demonstrated the importance of blocking the glucose oxidative pathway under highly aerobic conditions for acetoin production using E. aerogenes.

Original languageEnglish
Pages (from-to)114-118
Number of pages5
JournalEnzyme and Microbial Technology
Volume106
DOIs
Publication statusPublished - 2017 Nov 1

Keywords

  • 2-Ketogluconate
  • Acetoin
  • Enterobacter aerogenes
  • Glucose oxidative pathway
  • Metabolic engineering

ASJC Scopus subject areas

  • Biotechnology
  • Biochemistry
  • Applied Microbiology and Biotechnology

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