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Appl Environ Microbiol. 2012 Feb;78(4):913-21. doi: 10.1128/AEM.06803-11. Epub 2011 Dec 16.

Dissimilatory reduction of extracellular electron acceptors in anaerobic respiration.

Author information

1
Institut für Angewandte Biowissenschaften, Angewandte Biologie, Karlsruher Institut für Technologie, Karlsruhe, Germany.

Abstract

An extension of the respiratory chain to the cell surface is necessary to reduce extracellular electron acceptors like ferric iron or manganese oxides. In the past few years, more and more compounds were revealed to be reduced at the surface of the outer membrane of Gram-negative bacteria, and the list does not seem to have an end so far. Shewanella as well as Geobacter strains are model organisms to discover the biochemistry that enables the dissimilatory reduction of extracellular electron acceptors. In both cases, c-type cytochromes are essential electron-transferring proteins. They make the journey of respiratory electrons from the cytoplasmic membrane through periplasm and over the outer membrane possible. Outer membrane cytochromes have the ability to catalyze the last step of the respiratory chains. Still, recent discoveries provided evidence that they are accompanied by further factors that allow or at least facilitate extracellular reduction. This review gives a condensed overview of our current knowledge of extracellular respiration, highlights recent discoveries, and discusses critically the influence of different strategies for terminal electron transfer reactions.

PMID:
22179232
PMCID:
PMC3273014
DOI:
10.1128/AEM.06803-11
[Indexed for MEDLINE]
Free PMC Article

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