Cited by 126Microbial Metabolic Engineering and BioproductionBiofuel production and bioconversionMicrobial Fuel Cells and Bioremediation

Lactose-inducible system for metabolic engineering of Clostridium ljungdahlii

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Banerjee, Areen, Leang, Ching, Ueki, Toshiyuki, Nevin, Kelly P., Lovley, Derek R.·2014·Applied and Environmental Microbiology

Abstract

The development of tools for genetic manipulation of Clostridium ljungdahlii has increased its attractiveness as a chassis for autotrophic production of organic commodities and biofuels from syngas and microbial electrosynthesis and established it as a model organism for the study of the basic physiology of acetogenesis. In an attempt to expand the genetic toolbox for C. ljungdahlii, the possibility of adapting a lactose-inducible system for gene expression, previously reported for Clostridium perfringens, was investigated. The plasmid pAH2, originally developed for C. perfringens with a gusA reporter gene, functioned as an effective lactose-inducible system in C. ljungdahlii. Lactose induction of C. ljungdahlii containing pB1, in which the gene for the aldehyde/alcohol dehydrogenase AdhE1 was downstream of the lactose-inducible promoter, increased expression of adhE1 30-fold over the wild-type level, increasing ethanol production 1.5-fold, with a corresponding decrease in acetate production. Lactose-inducible expression of adhE1 in a strain in which adhE1 and the adhE1 homolog adhE2 had been deleted from the chromosome restored ethanol production to levels comparable to those in the wild-type strain. Inducing expression of adhE2 similarly failed to restore ethanol production, suggesting that adhE1 is the homolog responsible for ethanol production. Lactose-inducible expression of the four heterologous genes necessary to convert acetyl coenzyme A (acetyl-CoA) to acetone diverted ca. 60% of carbon flow to acetone production during growth on fructose, and 25% of carbon flow went to acetone when carbon monoxide was the electron donor. These studies demonstrate that the lactose-inducible system described here will be useful for redirecting carbon and electron flow for the biosynthesis of products more valuable than acetate. Furthermore, this tool should aid in optimizing microbial electrosynthesis and for basic studies on the physiology of acetogenesis.

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Authors
Banerjee, A., Leang, C., Ueki, T., Nevin, K. P., & Lovley, D. R.
Affiliations
University of Massachusetts Amherst (US)
Venue
Applied and Environmental Microbiology
Published
2014-04-15
Volume
80
Issue
8
Pages
2410-2416
ISSN
  • 0099-2240 (ISSN-L)
  • 1098-5336
OpenAlex
W2120580364
Cited by
126
References
34
Citations by year
2026: 7 · 2025: 9 · 2024: 7 · 2023: 5 · 2022: 16 · 2021: 15 · 2020: 7 · 2019: 13 · 2018: 7 · 2017: 12 · 2016: 10 · 2015: 14 · 2014: 4
FWCI
5.47
Type
journal article
Language
en
Open access
Locations
  • Applied and Environmental Microbiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
U.S. Department of Energy (DEAR0000159)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
  • Physical Sciences › Engineering › Biomedical Engineering › Biofuel production and bioconversion
  • Physical Sciences › Environmental Science › Environmental Engineering › Microbial Fuel Cells and Bioremediation
Keywords
Clostridium ljungdahlii, aldehyde/alcohol dehydrogenase, ethanol production, acetate production, acetone production, acetogenesis, syngas fermentation, microbial electrosynthesis
MeSH terms
Acetone, Acetyl Coenzyme A, Alcohol Dehydrogenase, Ethanol, Carbon, Clostridium, Fructose, Lactose, Transcriptional Activation, Gene Expression, Gene Expression Regulation, Bacterial, Acetic Acid, Metabolic Engineering, Metabolic Flux Analysis

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