Jump to main content
Jump to site search

Issue 122, 2015
Previous Article Next Article

Electron transport through electrically conductive nanofilaments in Rhodopseudomonas palustris strain RP2

Author affiliations

Abstract

Electronic dialogue between proteins is expected to be a key component of charge transport at the microbe–mineral interface (MMI) and requires complex structures. Microbial nanofilaments are one such structure produced in energetically engineered environments. These nanostructures consist of natural protein electronic conduits which can target the microbe–mineral interface and facilitate charge transport over a distance. Nanofilaments are phylogenetically diverse inducible extracellular appendages, and have the potential to serve as organic electronic conductors. However, recent investigations on such microbial nanofilaments have been confined to a few bacterial genera such as Geobacter, Shewanella and Synechocystis. Here, we report the evidence for longitudinal electron transport through inducible nanofilaments produced by another genus, the metabolically versatile photosynthetic, iron(III) respiring bacterium Rhodopseudomonas palustris strain RP2, in photic, iron(III) oxide-rich environments. In contrast, chemosynthetic dark-grown anoxic cells are weak in their ability to reduce ferric-oxide and no longer produce extracellular structures. Independent evaluation techniques illustrate the induction of extracellular filaments and their electrical properties. Scanning probe and nanofabricated electrode measurements provide conclusive evidence for the occurrence of direct charge transfer along the length and radius of nanofilaments from strain RP2. These findings not only expand our knowledge of the range of bacteria known to produce nanofilaments but also provide further research opportunities in the field of bionanotechnology, sustainable remediation (bioelectrochemical remediation systems) in contaminated sites (petroleum hydrocarbons) and MMI process at photic environments.

Graphical abstract: Electron transport through electrically conductive nanofilaments in Rhodopseudomonas palustris strain RP2

Back to tab navigation

Supplementary files

Publication details

The article was received on 11 May 2015, accepted on 18 Nov 2015 and first published on 24 Nov 2015


Article type: Paper
DOI: 10.1039/C5RA08742B
RSC Adv., 2015,5, 100790-100798
  • Open access: Creative Commons BY-NC license
  •   Request permissions

    Electron transport through electrically conductive nanofilaments in Rhodopseudomonas palustris strain RP2

    K. Venkidusamy, M. Megharaj, U. Schröder, F. Karouta, S. V. Mohan and R. Naidu, RSC Adv., 2015, 5, 100790
    DOI: 10.1039/C5RA08742B

    This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material and it is not used for commercial purposes.

    Reproduced material should be attributed as follows:

    • For reproduction of material from NJC:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
    • For reproduction of material from PCCP:
      [Original citation] - Published by the PCCP Owner Societies.
    • For reproduction of material from PPS:
      [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
    • For reproduction of material from all other RSC journals:
      [Original citation] - Published by The Royal Society of Chemistry.

    Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.

Search articles by author

Spotlight

Advertisements