Revealing extracellular electron transfer mediated parasitism: energetic considerations

Abstract Extracellular electron transfer (EET) is a mechanism that allows energetic coupling between two microorganisms or between a microorganism and an electrode surface. EET is either supported by direct physical contacts or mediated by electron shuttles. So far, studies dealing with interspecies...

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Autores principales:	Roman Moscoviz, Clément Flayac, Elie Desmond-Le Quéméner, Eric Trably, Nicolas Bernet
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d53982a1560644fe80b6ecd275c05a12
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spelling	oai:doaj.org-article:d53982a1560644fe80b6ecd275c05a122021-12-02T15:05:47ZRevealing extracellular electron transfer mediated parasitism: energetic considerations10.1038/s41598-017-07593-y2045-2322https://doaj.org/article/d53982a1560644fe80b6ecd275c05a122017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-07593-yhttps://doaj.org/toc/2045-2322Abstract Extracellular electron transfer (EET) is a mechanism that allows energetic coupling between two microorganisms or between a microorganism and an electrode surface. EET is either supported by direct physical contacts or mediated by electron shuttles. So far, studies dealing with interspecies EET (so-called IET) have mainly focused on possible syntrophic interactions between microorganisms favoured by this mechanism. In this article, the case of fermentative bacteria receiving extracellular electrons while fermenting a substrate is considered. A thermodynamical analysis based on metabolic energy balances was applied to re-investigate experimental data from the literature. Results suggest that the observations of a decrease of cell biomass yields of fermentative electron-accepting species, as mostly reported, can be unravelled by EET energetics and correspond to parasitism in case of IET. As an illustration, the growth yield decrease of Propionibacterium freudenreichii (−14%) observed in electro-fermentation experiments was fully explained by EET energetics when electrons were used by this species at a potential of −0.12 ± 0.01 V vs SHE. Analysis of other cases showed that, in addition to EET energetics in Clostridium pasteurianum, biological regulations can also be involved in such biomass yield decrease (−33% to −38%). Interestingly, the diminution of bacterial biomass production is always concomitant with an increased production of reduced compounds making IET-mediated parasitism and electro-fermentation attractive ways to optimize carbon fluxes in fermentation processes.Roman MoscovizClément FlayacElie Desmond-Le QuéménerEric TrablyNicolas BernetNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Roman Moscoviz Clément Flayac Elie Desmond-Le Quéméner Eric Trably Nicolas Bernet Revealing extracellular electron transfer mediated parasitism: energetic considerations
description	Abstract Extracellular electron transfer (EET) is a mechanism that allows energetic coupling between two microorganisms or between a microorganism and an electrode surface. EET is either supported by direct physical contacts or mediated by electron shuttles. So far, studies dealing with interspecies EET (so-called IET) have mainly focused on possible syntrophic interactions between microorganisms favoured by this mechanism. In this article, the case of fermentative bacteria receiving extracellular electrons while fermenting a substrate is considered. A thermodynamical analysis based on metabolic energy balances was applied to re-investigate experimental data from the literature. Results suggest that the observations of a decrease of cell biomass yields of fermentative electron-accepting species, as mostly reported, can be unravelled by EET energetics and correspond to parasitism in case of IET. As an illustration, the growth yield decrease of Propionibacterium freudenreichii (−14%) observed in electro-fermentation experiments was fully explained by EET energetics when electrons were used by this species at a potential of −0.12 ± 0.01 V vs SHE. Analysis of other cases showed that, in addition to EET energetics in Clostridium pasteurianum, biological regulations can also be involved in such biomass yield decrease (−33% to −38%). Interestingly, the diminution of bacterial biomass production is always concomitant with an increased production of reduced compounds making IET-mediated parasitism and electro-fermentation attractive ways to optimize carbon fluxes in fermentation processes.
format	article
author	Roman Moscoviz Clément Flayac Elie Desmond-Le Quéméner Eric Trably Nicolas Bernet
author_facet	Roman Moscoviz Clément Flayac Elie Desmond-Le Quéméner Eric Trably Nicolas Bernet
author_sort	Roman Moscoviz
title	Revealing extracellular electron transfer mediated parasitism: energetic considerations
title_short	Revealing extracellular electron transfer mediated parasitism: energetic considerations
title_full	Revealing extracellular electron transfer mediated parasitism: energetic considerations
title_fullStr	Revealing extracellular electron transfer mediated parasitism: energetic considerations
title_full_unstemmed	Revealing extracellular electron transfer mediated parasitism: energetic considerations
title_sort	revealing extracellular electron transfer mediated parasitism: energetic considerations
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/d53982a1560644fe80b6ecd275c05a12
work_keys_str_mv	AT romanmoscoviz revealingextracellularelectrontransfermediatedparasitismenergeticconsiderations AT clementflayac revealingextracellularelectrontransfermediatedparasitismenergeticconsiderations AT eliedesmondlequemener revealingextracellularelectrontransfermediatedparasitismenergeticconsiderations AT erictrably revealingextracellularelectrontransfermediatedparasitismenergeticconsiderations AT nicolasbernet revealingextracellularelectrontransfermediatedparasitismenergeticconsiderations
_version_	1718388735524995072

Revealing extracellular electron transfer mediated parasitism: energetic considerations

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