Journal
MOLECULAR MICROBIOLOGY
Volume 85, Issue 2, Pages 201-212Publisher
WILEY
DOI: 10.1111/j.1365-2958.2012.08088.x
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Funding
- Royal Society Wolfson Foundation
- Biotechnology and Biological Sciences Research Council [H007288/1]
- W. R. Wiley Environmental Molecular Sciences Laboratory
- US Department of Energy, Office of Biological and Environmental Research
- Biotechnology and Biological Sciences Research Council [BB/G009228/1, BB/H007288/1] Funding Source: researchfish
- BBSRC [BB/G009228/1, BB/H007288/1] Funding Source: UKRI
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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 porincytochrome 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.
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