Cited by 175Microbial Metabolic Engineering and BioproductionMicrobial Fuel Cells and BioremediationBiofuel production and bioconversion

Converting carbon dioxide to butyrate with an engineered strain of Clostridium ljungdahlii

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Ueki, Toshiyuki, Nevin, Kelly P., Woodard, Trevor L., Lovley, Derek R.·2014·mBio

Abstract

Microbial conversion of carbon dioxide to organic commodities via syngas metabolism or microbial electrosynthesis is an attractive option for production of renewable biocommodities. The recent development of an initial genetic toolbox for the acetogen Clostridium ljungdahlii has suggested that C. ljungdahlii may be an effective chassis for such conversions. This possibility was evaluated by engineering a strain to produce butyrate, a valuable commodity that is not a natural product of C. ljungdahlii metabolism. Heterologous genes required for butyrate production from acetyl-coenzyme A (CoA) were identified and introduced initially on plasmids and in subsequent strain designs integrated into the C. ljungdahlii chromosome. Iterative strain designs involved increasing translation of a key enzyme by modifying a ribosome binding site, inactivating the gene encoding the first step in the conversion of acetyl-CoA to acetate, disrupting the gene which encodes the primary bifunctional aldehyde/alcohol dehydrogenase for ethanol production, and interrupting the gene for a CoA transferase that potentially represented an alternative route for the production of acetate. These modifications yielded a strain in which ca. 50 or 70% of the carbon and electron flow was diverted to the production of butyrate with H2 or CO as the electron donor, respectively. These results demonstrate the possibility of producing high-value commodities from carbon dioxide with C. ljungdahlii as the catalyst. Importance: The development of a microbial chassis for efficient conversion of carbon dioxide directly to desired organic products would greatly advance the environmentally sustainable production of biofuels and other commodities. Clostridium ljungdahlii is an effective catalyst for microbial electrosynthesis, a technology in which electricity generated with renewable technologies, such as solar or wind, powers the conversion of carbon dioxide and water to organic products. Other electron donors for C. ljungdahlii include carbon monoxide, which can be derived from industrial waste gases or the conversion of recalcitrant biomass to syngas, as well as hydrogen, another syngas component. The finding that carbon and electron flow in C. ljungdahlii can be diverted from the production of acetate to butyrate synthesis is an important step toward the goal of renewable commodity production from carbon dioxide with this organism.

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  1. [28]Playne MJ. 1985. Propionic and butyric acids, p 731– 759. In Moo-Young M (ed), Comprehensive biotechnology. Pergamon Press, Oxford, United Kingdom

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Authors
Ueki, T., Nevin, K. P., Woodard, T. L., & Lovley, D. R.
Affiliations
University of Massachusetts Amherst (US)
Corresponding author
Ueki, Toshiyuki
Venue
mBio
Published
2014-10-31
Volume
5
Issue
5
Pages
e01636-14
ISSN
  • 2150-7511 (ISSN-L)
  • 2161-2129
OpenAlex
W2106450419
Cited by
175
References
64
Citations by year
2026: 5 · 2025: 11 · 2024: 15 · 2023: 14 · 2022: 10 · 2021: 24 · 2020: 17 · 2019: 11 · 2018: 13 · 2017: 20 · 2016: 22 · 2015: 10 · 2014: 3
FWCI
7.52
Type
journal article
Language
en
Open access
Locations
  • mBio (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion, cc-by-nc-sa)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
U.S. Department of Energy (DEAR0000159)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial Metabolic Engineering and Bioproduction
  • Physical Sciences › Environmental Science › Environmental Engineering › Microbial Fuel Cells and Bioremediation
  • Physical Sciences › Engineering › Biomedical Engineering › Biofuel production and bioconversion
Keywords
Clostridium ljungdahlii, butyrate production, CO2 conversion, acetogenic bacteria, microbial electrosynthesis, metabolic engineering, ribosome binding site optimization, aldehyde/alcohol dehydrogenase, CoA transferase, acetate production
MeSH terms
Acetyl Coenzyme A, Butyrates, Carbon Dioxide, Clostridium, Recombinant Proteins, Metabolic Networks and Pathways, Metabolic Engineering, Metabolic Flux Analysis

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