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Geobacter sulfurreducens pili are conductive microbial nanowires essential for electron transport. Shewanella oneidensis outer membrane extensions were previously misidentified as conductive pili.

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Area of Science:

  • Microbiology
  • Biophysics
  • Electrochemistry

Background:

  • Microbial nanowires facilitate extracellular electron transfer.
  • Geobacter sulfurreducens pili exhibit metallic-like conductivity.
  • Previous studies suggested Shewanella oneidensis also produce conductive pili.

Purpose of the Study:

  • Clarify the properties and function of microbial nanowires.
  • Differentiate conductive pili of G. sulfurreducens from outer membrane extensions of S. oneidensis.

Main Methods:

  • Novel live-imaging techniques.
  • Electrostatic force microscopy.
  • Analysis of pili and outer membrane composition.

Main Results:

  • G. sulfurreducens pili possess metallic-like conductivity due to pi-pi orbital overlap.
  • Charge propagation confirmed along G. sulfurreducens pili, similar to carbon nanotubes.
  • S. oneidensis filaments are outer membrane extensions, not conductive pili, with unconfirmed hydrated conductivity.

Conclusions:

  • G. sulfurreducens conductive pili and S. oneidensis membrane extensions differ fundamentally in composition, electron transport, and role.
  • New methods for evaluating filament conductivity will aid in discovering and understanding microbial nanowires.