Cited by 52Microbial Metabolic Engineering and BioproductionBiofuel production and bioconversionAnaerobic Digestion and Biogas Production

Improved conversion efficiencies for n-fatty acid reduction to primary alcohols by the solventogenic acetogen “Clostridium ragsdalei.”

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Isom, Catherine E., Nanny, Mark A., Tanner, Ralph S.·2015·Journal of Industrial Microbiology & Biotechnology

Abstract

"Clostridium ragsdalei" is an acetogen that ferments synthesis gas (syngas, predominantly H2:CO2:CO) to ethanol, acetate, and cell mass. Previous research showed that C. ragsdalei could also convert propionic acid to 1-propanol and butyric acid to 1-butanol at conversion efficiencies of 72.3 and 21.0 percent, respectively. Our research showed that C. ragsdalei can also reduce pentanoic and hexanoic acid to the corresponding primary alcohols. This reduction occurred independently of growth in an optimized medium with headspace gas exchange (vented and gassed with CO) every 48 h. Under these conditions, conversion efficiencies increased to 97 and 100 % for propionic and butyric acid, respectively. The conversion efficiencies for pentanoic and hexanoic acid to 1-pentanol and 1-hexanol, respectively, were 82 and 62 %. C. ragsdalei also reduced acetone to 2-propanol at a conversion efficiency of 100 %. Further, we showed that C. ragsdalei uses an aldehyde oxidoreductase-like enzyme to reduce n-fatty acids to the aldehyde intermediates in a reaction that requires ferredoxin and exogenous CO.

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Authors
Isom, C. E., Nanny, M. A., & Tanner, R. S.
Affiliations
University of Oklahoma (US)
Corresponding author
Isom, Catherine E.
Venue
Journal of Industrial Microbiology & Biotechnology
Published
2014-11-20
Volume
42
Issue
1
Pages
29-38
ISSN
  • 1367-5435 (ISSN-L)
  • 1476-5535
OpenAlex
W2120783226
Cited by
52
References
38
Citations by year
2026: 3 · 2025: 2 · 2024: 6 · 2023: 2 · 2022: 6 · 2021: 5 · 2020: 4 · 2019: 6 · 2018: 4 · 2017: 6 · 2016: 6 · 2015: 2
FWCI
1.91
Type
journal article
Language
en
Open access
Locations
  • Journal of Industrial Microbiology & Biotechnology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Agriculture
  • Cooperative State Research, Education, and Extension Service
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 › Engineering › Building and Construction › Anaerobic Digestion and Biogas Production
Keywords
primary alcohols, 1-pentanol, 1-hexanol, 1-propanol, n-butanol, propionic acid, butyrate, valeric acid, hexanoic acid, ferredoxin, carbon monoxide, conversion efficiency
MeSH terms
Acetone, Alcohol Dehydrogenase, Ethanol, Pentanols, Aldehyde Oxidoreductases, Amino Acid Sequence, Caproates, Clostridium, Fatty Acids, Fermentation, Gases, Molecular Sequence Data, Multienzyme Complexes, Magnetic Resonance Spectroscopy, Pentanoic Acids, Propionates, Acetic Acid, 2-Propanol, 1-Butanol, Butyric Acid

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