NDLI: Cyclic voltammetry of biofilms of wild type and mutant <i>Geobacter sulfurreducens</i> on fuel cell anodes indicates possible roles of OmcB, OmcZ, type IV pili, and protons in extracellular electron transfer

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Cyclic voltammetry of biofilms of wild type and mutant Geobacter sulfurreducens on fuel cell anodes indicates possible roles of OmcB, OmcZ, type IV pili, and protons in extracellular electron transfer

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Energy & Environmental Science Vol - 2 Issue - 4

Energy & Environmental Science Vol - 2 Issue - 3

Energy & Environmental Science Vol - 2 Issue - 2

Energy & Environmental Science Vol -1

Cyclic voltammetry of biofilms of wild type and mutant Geobacter sulfurreducens on fuel cell anodes indicates possible roles of OmcB, OmcZ, type IV pili, and protons in extracellular electron transfer

Content Provider	Royal Society of Chemistry (RSC)
Author	Lowy, Daniel A. Nevin, Kelly P. Jia, Hongfei Lovley, Derek R. Tender, Leonard M. Richter, Hanno
Copyright Year	2009
Abstract	Geobacteracea are distinct for their ability to reduce insoluble oxidants including minerals and electrodes without apparent reliance on soluble extracellular electron transfer (ET) mediators. This property makes them important anode catalysts in new generation microbial fuel cells (MFCs) because it obviates the need to replenish ET mediators otherwise necessary to sustain power. Here we report cyclic voltammetry (CV) of biofilms of wild type (WT) and mutant G. sulfurreducens strains grown on graphite cloth anodes acting as electron acceptors with acetate as the electron donor. Our analysis indicates that WT biofilms contain a conductive network of bound ET mediators in which OmcZ (outer membranec-type cytochrome Z) participates in homogeneous ET (through the biofilm bulk) while OmcB mediates heterogeneous ET (across the biofilm/electrode interface); that type IV pili are important in both reactions; that OmcS plays a secondary role in homogenous ET; that OmcE, important in Fe(III) oxide reduction, is not involved in either reaction; that catalytic current is limited overall by the rate of microbial uptake of acetate; that protons generated from acetate oxidation act as charge compensating ions in homogenous ET; and that homogenous ET, when accelerated by fast voltammetric scan rates, is limited by diffusion of protons within the biofilm. These results provide the first direct electrochemical evidence substantiating utilization of bound ET mediators by Geobacter biofilms and the distinct roles of OmcB and OmcZ in the extracellular ET properties of anode-reducing G. sulfurreducens.
Starting Page	506
Ending Page	516
Page Count	11
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	2
Issue Number	5
Journal	Energy & Environmental Science
DOI	10.1039/b816647a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Geobacter Anode Cyclic voltammetry Mutation Graphite Redox Biofilm Electrode Pilus Diffusion Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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Cyclic Voltammetry of Biofilms of Wild Type and Mutant Geobacter Sulfurreducens on Fuel Cell Anodes Indicates Possible Roles of OmcB, OmcZ, type IV Pili, and Protons in Extracellular Electron Transfer

Application of cyclic voltammetry to investigate enhanced catalytic current generation by biofilm-modified anodes of Geobacter sulfurreducens strain DL1 vs. variant strain KN400

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Abundance of the multiheme c-type cytochrome OmcB increases in outer biofilm layers of electrode-grown Geobacter sulfurreducens.

Lack of cytochrome involvement in long-range electron transport through conductive biofilms and nanowires of Geobacter sulfurreducens

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Cyclic voltammetry of biofilms of wild type and mutant Geobacter sulfurreducens on fuel cell anodes indicates possible roles of OmcB, OmcZ, type IV pili, and protons in extracellular electron transfer

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Cyclic Voltammetry of Biofilms of Wild Type and Mutant Geobacter Sulfurreducens on Fuel Cell Anodes Indicates Possible Roles of OmcB, OmcZ, type IV Pili, and Protons in Extracellular Electron Transfer

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Cyclic voltammetry of biofilms of wild type and mutant Geobacter sulfurreducens on fuel cell anodes indicates possible roles of OmcB, OmcZ, type IV pili, and protons in extracellular electron transfer