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Interaction of living cable bacteria with carbon electrodes in bioelectrochemical systems.
Bonné, Robin; Marshall, Ian P G; Bjerg, Jesper J; Marzocchi, Ugo; Manca, Jean; Nielsen, Lars Peter; Aiyer, Kartik.
Afiliación
  • Bonné R; Department of Biology, Center for Electromicrobiology, Aarhus University, Aarhus, Denmark.
  • Marshall IPG; Department of Biology, Center for Electromicrobiology, Aarhus University, Aarhus, Denmark.
  • Bjerg JJ; Department of Biology, Center for Electromicrobiology, Aarhus University, Aarhus, Denmark.
  • Marzocchi U; Department of Biology, Center for Electromicrobiology, Aarhus University, Aarhus, Denmark.
  • Manca J; Department of Biology, Center for Water Technology (WATEC), Aarhus University, Aarhus, Denmark.
  • Nielsen LP; X-LAB, Hasselt University, Agoralaan, Diepenbeek, Belgium.
  • Aiyer K; Department of Biology, Center for Electromicrobiology, Aarhus University, Aarhus, Denmark.
Appl Environ Microbiol ; 90(8): e0079524, 2024 Aug 21.
Article en En | MEDLINE | ID: mdl-39082847
ABSTRACT
Cable bacteria are filamentous bacteria that couple the oxidation of sulfide in sediments to the reduction of oxygen via long-distance electron transport over centimeter distances through periplasmic wires. However, the capability of cable bacteria to perform extracellular electron transfer to acceptors, such as electrodes, has remained elusive. In this study, we demonstrate that living cable bacteria actively move toward electrodes in different bioelectrochemical systems. Carbon felt and carbon fiber electrodes poised at +200 mV attracted live cable bacteria from the sediment. When the applied potential was switched off, cable bacteria retracted from the electrode. qPCR and scanning electron microscopy corroborated this finding and revealed cable bacteria in higher abundance present on the electrode surface compared with unpoised controls. These experiments raise new possibilities to study metabolism of cable bacteria and cultivate them in bioelectrochemical devices for bioelectronic applications, such as biosensing and bioremediation. IMPORTANCE Extracellular electron transfer is a metabolic function associated with electroactive bacteria wherein electrons are exchanged with external electron acceptors or donors. This feature has enabled the development of several applications, such as biosensing, carbon capture, and energy recovery. Cable bacteria are a unique class of long, filamentous microbes that perform long-distance electron transport in freshwater and marine sediments. In this study, we demonstrate the attraction of cable bacteria toward carbon electrodes and demonstrate their potential electroactivity. This finding enables electronic control and monitoring of the metabolism of cable bacteria and may, in turn, aid in the development of bioelectronic applications.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Bacterias / Fuentes de Energía Bioeléctrica / Electrodos Idioma: En Revista: Appl Environ Microbiol Año: 2024 Tipo del documento: Article País de afiliación: Dinamarca Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Bacterias / Fuentes de Energía Bioeléctrica / Electrodos Idioma: En Revista: Appl Environ Microbiol Año: 2024 Tipo del documento: Article País de afiliación: Dinamarca Pais de publicación: Estados Unidos