The ‘porin–cytochrome’ model for microbe‐to‐mineral electron transfer
- 30 May 2012
- journal article
- review article
- Published by Wiley in Molecular Microbiology
- Vol. 85 (2), 201-212
- https://doi.org/10.1111/j.1365-2958.2012.08088.x
Abstract
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.Keywords
This publication has 59 references indexed in Scilit:
- Solution-Based Structural Analysis of the Decaheme Cytochrome, MtrA, by Small-Angle X-ray Scattering and Analytical UltracentrifugationThe Journal of Physical Chemistry B, 2011
- Tunable metallic-like conductivity in microbial nanowire networksNature Nanotechnology, 2011
- Characterization of the Decaheme c-Type Cytochrome OmcA in Solution and on Hematite Surfaces by Small Angle X-Ray Scattering and Neutron ReflectometryBiophysical Journal, 2010
- Direct assignment of EPR spectra to structurally defined iron-sulfur clusters in complex I by double electron–electron resonanceProceedings of the National Academy of Sciences of the United States of America, 2010
- Characterization of an electron conduit between bacteria and the extracellular environmentProceedings of the National Academy of Sciences of the United States of America, 2009
- Lysine-91 of the tetraheme c-type cytochrome CymA is essential for quinone interaction and arsenate respiration in Shewanella sp. strain ANA-3Archiv für Mikrobiologie, 2009
- Shewanella secretes flavins that mediate extracellular electron transferProceedings of the National Academy of Sciences of the United States of America, 2008
- In Vivo Identification of the Outer Membrane Protein OmcA−MtrC Interaction Network in Shewanella oneidensis MR-1 Cells Using Novel Hydrophobic Chemical Cross-LinkersJournal of Proteome Research, 2008
- The crystal structure of the pentahaem c-type cytochrome NrfB and characterization of its solution-state interaction with the pentahaem nitrite reductase NrfABiochemical Journal, 2007
- Electrically conductive bacterial nanowires produced by Shewanella oneidensis strain MR-1 and other microorganismsProceedings of the National Academy of Sciences of the United States of America, 2006