The ‘porin-cytochrome’ model for microbe-to-mineral electron transfer

Richardson, David J. ORCID:, Butt, Julea N. ORCID:, Fredrickson, Jim K., Zachara, John M., Shi, Liang, Edwards, Marcus J., White, Gaye, Baiden, Nanakow, Gates, Andrew J. ORCID:, Marritt, Sophie J. and Clarke, Thomas A. ORCID: (2012) The ‘porin-cytochrome’ model for microbe-to-mineral electron transfer. Molecular Microbiology, 85 (2). pp. 201-212. ISSN 1365-2958

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Many species of bacteria can couple anaerobic growth to the respiratory reduction of insoluble minerals containing Fe(III) or Mn(III/IV). It has been suggested that in Shewanella species electrons cross the outer membrane to extracellular substrates via ‘porin–cytochrome’ electron transport modules. The molecular structure of an outer-membrane extracellular-facing deca-haem terminus for such a module has recently been resolved. It is debated how, once outside the cells, electrons are transferred from outer-membrane cytochromes to insoluble electron sinks. This may occur directly or by assemblies of cytochromes, perhaps functioning as ‘nanowires’, or via electron shuttles. Here we review recent work in this field and explore whether it allows for unification of the electron transport mechanisms supporting extracellular mineral respiration in Shewanella that may extend into other genera of Gram-negative bacteria.

Item Type: Article
Faculty \ School: Faculty of Science > School of Biological Sciences
Depositing User: Users 2731 not found.
Date Deposited: 17 Aug 2012 11:26
Last Modified: 14 May 2023 23:57
DOI: 10.1111/j.1365-2958.2012.08088.x

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