Cited by 39Microbial Fuel Cells and BioremediationMicrobial bioremediation and biosurfactantsEvolution and Genetic Dynamics

Laboratory evolution of Geobacter sulfurreducens for enhanced growth on lactate via a single-base-pair substitution in a transcriptional regulator

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Summers, Zarath M, Ueki, Toshiyuki, Ismail, Wael, Haveman, Shelley A, Lovley, Derek R·2012·The ISME Journal

Abstract

The addition of organic compounds to groundwater in order to promote bioremediation may represent a new selective pressure on subsurface microorganisms. The ability of Geobacter sulfurreducens, which serves as a model for the Geobacter species that are important in various types of anaerobic groundwater bioremediation, to adapt for rapid metabolism of lactate, a common bioremediation amendment, was evaluated. Serial transfer of five parallel cultures in a medium with lactate as the sole electron donor yielded five strains that could metabolize lactate faster than the wild-type strain. Genome sequencing revealed that all five strains had non-synonymous single-nucleotide polymorphisms in the same gene, GSU0514, a putative transcriptional regulator. Introducing the single-base-pair mutation from one of the five strains into the wild-type strain conferred rapid growth on lactate. This strain and the five adaptively evolved strains had four to eight-fold higher transcript abundance than wild-type cells for genes for the two subunits of succinyl-CoA synthase, an enzyme required for growth on lactate. DNA-binding assays demonstrated that the protein encoded by GSU0514 bound to the putative promoter of the succinyl-CoA synthase operon. The binding sequence was not apparent elsewhere in the genome. These results demonstrate that a single-base-pair mutation in a transcriptional regulator can have a significant impact on the capacity for substrate utilization and suggest that adaptive evolution should be considered as a potential response of microorganisms to environmental change(s) imposed during bioremediation.

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  • Other studies reported improved growth on many non-evolutionary carbon sources after batch selection with gluconeogenic carbon sources.

    “whereas other studies reported improved growth on many non-evolutionary carbon sources after batch selection with gluconeogenic carbon sources [66,67].”

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Authors
Summers, Z. M., Ueki, T., Ismail, W., Haveman, S. A., & Lovley, D. R.
Affiliations
  • University of Massachusetts Amherst (US)
  • Arabian Gulf University (BH)
  • Luca Technologies Inc. , Golden, CO , USA
Corresponding author
Summers, Zarath M
Venue
The ISME Journal
Published
2011-11-24
Volume
6
Issue
5
Pages
975-983
ISSN
  • 1751-7362 (ISSN-L)
  • 1751-7370
OpenAlex
W2085912383
Cited by
39
References
58
Citations by year
2026: 3 · 2025: 1 · 2024: 4 · 2023: 1 · 2022: 3 · 2020: 6 · 2019: 7 · 2018: 1 · 2017: 3 · 2015: 2 · 2013: 3 · 2012: 4
FWCI
2.27
Type
journal article
Language
en
Open access
Locations
  • The ISME Journal (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Energy (FC02-02ER63446)
  • Office of Science
Topics
  • Physical Sciences › Environmental Science › Environmental Engineering › Microbial Fuel Cells and Bioremediation
  • Physical Sciences › Environmental Science › Pollution › Microbial bioremediation and biosurfactants
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Evolution and Genetic Dynamics
Keywords
Geobacter sulfurreducens, lactate metabolism, experimental evolution, adaptive evolution, transcription factors, single nucleotide polymorphisms, anaerobic bioremediation, groundwater bioremediation, DNA binding, promoter regulation, substrate utilization
MeSH terms
Adaptation, Biological, Amino Acid Sequence, Base Sequence, Biodegradation, Environmental, DNA, Bacterial, Molecular Sequence Data, Mutation, Operon, Promoter Regions, Genetic, Sequence Analysis, DNA, Evolution, Molecular, Lactic Acid, Base Pairing, Geobacter, Groundwater

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