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Area of Science:

  • Microbiology
  • Bioelectrochemistry
  • Gut Microbiome

Background:

  • Electrogenic Gram-negative bacteria in anaerobic environments are well-studied.
  • Gram-positive bacteria were historically considered weak exoelectrogens due to their cell walls.
  • Recent findings highlight electrogenicity in Gram-positive pathogens, prompting investigation into gut microbiota.

Purpose of the Study:

  • To characterize the extracellular electron-transfer capabilities of five key gut bacteria.
  • To explore the potential of Gram-positive bacteria as exoelectrogens for novel applications.
  • To develop a screening method for identifying electrogenic gut bacteria and their pathways.

Main Methods:

  • Utilized a 21-well paper-based microbial fuel cell array for high-throughput screening.
  • Assessed electrogenic capabilities of *Staphylococcus aureus*, *Enterococcus faecalis*, *Streptococcus agalactiae*, *Lactobacillus reuteri*, and *Lactobacillus rhamnosus*.
  • Initiated a transposon screen to identify genes involved in electrogenicity in *S. aureus*.

Main Results:

  • *Staphylococcus aureus*, *Enterococcus faecalis*, and *Streptococcus agalactiae* demonstrated significant electrogenic capabilities.
  • Power generation by these Gram-positive bacteria was comparable to the known exoelectrogen *Shewanella oneidensis*.
  • The developed microbial fuel cell array proved effective for simultaneous characterization of bacterial electrogenicity.

Conclusions:

  • Gram-positive gut bacteria possess notable electrogenic potential, challenging previous assumptions.
  • This research paves the way for developing bio-powered implantable devices and gastrointestinal biosensors.
  • Identified key electrogenic Gram-positive species and initiated genetic analysis of electron transfer pathways.