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A theoretical framework to understand high electron mobilities in cable bacteria.

Andrew J Smith1, David N Beratan1,2,3

  • 1Department of Chemistry, Duke University Durham NC 27708 USA.

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Summary
This summary is machine-generated.

Cable bacteria exhibit centimeter-scale electron transport. Theoretical analysis reveals that vibronically coupled multi-step hopping, not delocalization or polarons, likely explains their high conductivity.

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Area of Science:

  • Microbiology
  • Biophysics
  • Biochemistry

Background:

  • Cable bacteria possess exceptionally long electron-transport pathways, reaching centimeter scales.
  • These microorganisms exhibit remarkably high electrical conductivities.
  • The precise mechanism underlying this electron transport remains poorly understood.

Purpose of the Study:

  • To theoretically investigate and elucidate the electron transport mechanisms in cable bacteria.
  • To evaluate proposed models, including carrier delocalization and large polarons.
  • To identify the dominant mechanism responsible for high conductivity in these bacteria.

Main Methods:

  • Theoretical analysis of electron transport pathways.
  • Modeling of charge carrier behavior over large length scales.
  • Assessment of vibronic coupling and hopping transport models.

Main Results:

  • Extended carrier delocalization and large polarons were found to be insufficient explanations.
  • Vibronically coupled multi-step hopping emerged as the most plausible mechanism.
  • This mechanism effectively explains electron transport on the centimeter scale observed in cable bacteria.

Conclusions:

  • Vibronically coupled multi-step hopping is the primary mechanism for biological electron transport in cable bacteria.
  • This finding clarifies a long-standing question regarding their high conductivity.
  • The study provides a new framework for understanding electron transport in filamentous microorganisms.