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Science China Life Sciences

, Volume 62, Issue 10, pp 1275–1286 | Cite as

Molecular underpinnings for microbial extracellular electron transfer during biogeochemical cycling of earth elements

  • Yongguang Jiang
  • Meimei Shi
  • Liang ShiEmail author
Review

Abstract

Microbial extracellular electron transfer (EET) is electron exchanges between the quinol/quinone pools in microbial cytoplasmic membrane and extracellular substrates. Microorganisms with EET capabilities are widespread in Earth hydrosphere, such as sediments of rivers, lakes and oceans, where they play crucial roles in biogeochemical cycling of key elements, including carbon, nitrogen, sulfur, iron and manganese. Over the past 12 years, significant progress has been made in mechanistic understanding of microbial EET at the molecular level. In this review, we focus on the molecular mechanisms underlying the microbial ability for extracellular redox transformation of iron, direct interspecies electron transfer as well as long distance electron transfer mediated by the cable bacteria in the hydrosphere.

Keywords

microbial extracellular electron transfer molecular mechanisms multiheme c-type cytochrome conductive nanowires direct interspecies electron transfer cable bacteria biogeochemical cycling of elements Earth hydrosphere 

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Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (NSFC91851211; 41772363), One Hundred Talents Program of Hubei Province and China University of Geosciences-Wuhan.

Compliance and ethics The author(s) declare that they have no conflict of interest.

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© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Biological Sciences and Technology, School of Environmental StudiesChina University of GeosciencesWuhanChina
  2. 2.State Key Laboratory of Biogeology and Environmental GeologyChina University of GeosciencesWuhanChina

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