ArticleApplied and environmental microbiology2014
Direct interspecies electron transfer between Geobacter metallireducens and Methanosarcina barkeri.
Article in Applied and environmental microbiology, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 181 papers.
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181 citing papers in PubMed, 894 citations in OpenAlex.
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- Biophotocatalytic and bioelectrocatalytic strategies for methane production and oxidation: emerging pathways and perspectives.Archives of microbiology · 2026Review
- Genome-centric metagenomics reveals electroactive syntrophs in a conductive particle-dependent consortium from coastal sediments.Nature communications · 2026Article
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- Real time monitoring of hydrogenotrophic methanogenesis under deep saline aquifers conditions.Journal of biological engineering · 2026Article
- Deep-sea anaerobic microbial communities couple degradation of insoluble chitin to extracellular electron transfer.The ISME journal · 2026Article
- Defined Electrosynthetic Microbial Consortia Reveal Electron Transfer Modes Governing Acetate Production.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2026Article
- The role ofSustainable microbiology · 2026Review
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- Interspecies electron transfer of mixed-species biofilms in microbial corrosion of metals: mechanisms and mitigation strategies.World journal of microbiology & biotechnology · 2025Review
- Electron conductive compounds alter fermentative pathways and cooperation in Clostridium carboxidivorans and Clostridium acetobutylicum in co-culture.FEMS microbiology ecology · 2025Article
- Cell surface differences within the genusJournal of bacteriology · 2025Review
- Hemin-binding DNA structures on the surface of bacteria promote extracellular electron transfer.Nucleic acids research · 2025Article
121 more citing papers are in PubMed but not listed here.
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Authors and funding
7 authors at 1 institution in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Direct interspecies electron transfer (DIET) is potentially an effective form of syntrophy in methanogenic communities, but little is known about the diversity of methanogens capable of DIET. The ability of Methanosarcina barkeri to participate in DIET was evaluated in coculture with Geobacter metallireducens. Cocultures formed aggregates that shared electrons via DIET during the stoichiometric conversion of ethanol to methane. Cocultures could not be initiated with a pilin-deficient G. metallireducens strain, suggesting that long-range electron transfer along pili was important for DIET. Amendments of granular activated carbon permitted the pilin-deficient G. metallireducens isolates to share electrons with M. barkeri, demonstrating that this conductive material could substitute for pili in promoting DIET. When M. barkeri was grown in coculture with the H2-producing Pelobacter carbinolicus, incapable of DIET, M. barkeri utilized H2 as an electron donor but metabolized little of the acetate that P.carbinolicus produced. This suggested that H2, but not electrons derived from DIET, inhibited acetate metabolism. P. carbinolicus-M. barkeri cocultures did not aggregate, demonstrating that, unlike DIET, close physical contact was not necessary for interspecies H2 transfer. M. barkeri is the second methanogen found to accept electrons via DIET and the first methanogen known to be capable of using either H2 or electrons derived from DIET for CO2 reduction. Furthermore, M. barkeri is genetically tractable,making it a model organism for elucidating mechanisms by which methanogens make biological electrical connections with other cells.
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