Mechanisms of Bacterial Extracellular Electron Exchange

White, Gaye F., Edwards, Marcus J., Gomez-Perez, Laura, Richardson, David J. ORCID:, Butt, Julea N. ORCID: and Clarke, Thomas A. ORCID: (2016) Mechanisms of Bacterial Extracellular Electron Exchange. In: Advances in Microbial Physiology. Elsevier, pp. 87-138. ISBN 978-0-12-804822-1

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The biochemical mechanisms by which microbes interact with extracellular soluble metal ions and insoluble redox-active minerals have been the focus of intense research over the last three decades. The process presents two challenges to the microorganism; firstly electrons have to be transported at the cell surface, which in Gram negative bacteria presents an additional problem of electron transfer across the ~ 6 nm of the outer membrane. Secondly the electrons must be transferred to or from the terminal electron acceptors or donors. This review covers the known mechanisms that bacteria use to transport electrons across the cell envelope to external electron donors/acceptors. In Gram negative bacteria electron transfer across the outer membrane involves the use of an outer membrane β-barrel and cytochrome. These can be in the form of a porin-cytochrome protein, such as Cyc2 of Acidothiobacillus ferrioxydans, or a multiprotein porin-cytochrome complex like MtrCAB of Shewanella oneidensis MR-1. For mineral respiring organisms there is the additional challenge of transferring the electrons from the cell to mineral surface. For the strict anaerobe Geobacter sulfurreducens this requires electron transfer through conductive pili to associated cytochrome OmcS that directly reduces Fe(III)oxides, while the facultative anaerobe S. oneidensis MR-1 accomplishes mineral reduction through direct membrane contact, contact through filamentous extentions and soluble flavin shuttles, all of which require the outer membrane cytochromes MtrC and OmcA in addition to secreted flavin.

Item Type: Book Section
Uncontrolled Keywords: shewanella,ron oxide,porin-cytochrome,nanowire,cytochrome,mineral reducing bacteria, mineral oxidising bacteria,acidithiobacillus,geobacter
Faculty \ School: Faculty of Science > School of Biological Sciences

Faculty of Science > School of Chemistry
Faculty of Science > School of Natural Sciences
UEA Research Groups: Faculty of Science > Research Groups > Molecular Microbiology
Faculty of Science > Research Groups > Organisms and the Environment
Faculty of Science > Research Groups > Biophysical Chemistry (former - to 2017)
Faculty of Science > Research Groups > Chemistry of Light and Energy
Faculty of Science > Research Groups > Chemistry of Life Processes
Faculty of Science > Research Centres > Centre for Molecular and Structural Biochemistry
Faculty of Science > Research Groups > Energy Materials Laboratory
Depositing User: Pure Connector
Date Deposited: 13 Apr 2016 08:47
Last Modified: 31 Oct 2023 02:44
DOI: 10.1016/bs.ampbs.2016.02.002

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