Anaerobic oxidation of methane coupled with extracellular electron transfer to electrodes

Abstract Anaerobic oxidation of methane (AOM) is an important process for understanding the global flux of methane and its relation to the global carbon cycle. Although AOM is known to be coupled to reductions of sulfate, nitrite, and nitrate, evidence that AOM is coupled with extracellular electron...

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Autores principales:	Yaohuan Gao, Jangho Lee, Josh D. Neufeld, Joonhong Park, Bruce E. Rittmann, Hyung-Sool Lee
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/fb65be32a16540de9daffd34a4476722
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spelling	oai:doaj.org-article:fb65be32a16540de9daffd34a44767222021-12-02T15:05:38ZAnaerobic oxidation of methane coupled with extracellular electron transfer to electrodes10.1038/s41598-017-05180-92045-2322https://doaj.org/article/fb65be32a16540de9daffd34a44767222017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05180-9https://doaj.org/toc/2045-2322Abstract Anaerobic oxidation of methane (AOM) is an important process for understanding the global flux of methane and its relation to the global carbon cycle. Although AOM is known to be coupled to reductions of sulfate, nitrite, and nitrate, evidence that AOM is coupled with extracellular electron transfer (EET) to conductive solids is relatively insufficient. Here, we demonstrate EET-dependent AOM in a biofilm anode dominated by Geobacter spp. and Methanobacterium spp. using carbon-fiber electrodes as the terminal electron sink. The steady-state current density was kept at 11.0 ± 1.3 mA/m2 in a microbial electrochemical cell, and isotopic experiments supported AOM-EET to the anode. Fluorescence in situ hybridization images and metagenome results suggest that Methanobacterium spp. may work synergistically with Geobacter spp. to allow AOM, likely by employing intermediate (formate or H2)-dependent inter-species electron transport. Since metal oxides are widely present in sedimentary and terrestrial environments, an AOM-EET niche would have implications for minimizing the net global emissions of methane.Yaohuan GaoJangho LeeJosh D. NeufeldJoonhong ParkBruce E. RittmannHyung-Sool LeeNature 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 Yaohuan Gao Jangho Lee Josh D. Neufeld Joonhong Park Bruce E. Rittmann Hyung-Sool Lee Anaerobic oxidation of methane coupled with extracellular electron transfer to electrodes
description	Abstract Anaerobic oxidation of methane (AOM) is an important process for understanding the global flux of methane and its relation to the global carbon cycle. Although AOM is known to be coupled to reductions of sulfate, nitrite, and nitrate, evidence that AOM is coupled with extracellular electron transfer (EET) to conductive solids is relatively insufficient. Here, we demonstrate EET-dependent AOM in a biofilm anode dominated by Geobacter spp. and Methanobacterium spp. using carbon-fiber electrodes as the terminal electron sink. The steady-state current density was kept at 11.0 ± 1.3 mA/m2 in a microbial electrochemical cell, and isotopic experiments supported AOM-EET to the anode. Fluorescence in situ hybridization images and metagenome results suggest that Methanobacterium spp. may work synergistically with Geobacter spp. to allow AOM, likely by employing intermediate (formate or H2)-dependent inter-species electron transport. Since metal oxides are widely present in sedimentary and terrestrial environments, an AOM-EET niche would have implications for minimizing the net global emissions of methane.
format	article
author	Yaohuan Gao Jangho Lee Josh D. Neufeld Joonhong Park Bruce E. Rittmann Hyung-Sool Lee
author_facet	Yaohuan Gao Jangho Lee Josh D. Neufeld Joonhong Park Bruce E. Rittmann Hyung-Sool Lee
author_sort	Yaohuan Gao
title	Anaerobic oxidation of methane coupled with extracellular electron transfer to electrodes
title_short	Anaerobic oxidation of methane coupled with extracellular electron transfer to electrodes
title_full	Anaerobic oxidation of methane coupled with extracellular electron transfer to electrodes
title_fullStr	Anaerobic oxidation of methane coupled with extracellular electron transfer to electrodes
title_full_unstemmed	Anaerobic oxidation of methane coupled with extracellular electron transfer to electrodes
title_sort	anaerobic oxidation of methane coupled with extracellular electron transfer to electrodes
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/fb65be32a16540de9daffd34a4476722
work_keys_str_mv	AT yaohuangao anaerobicoxidationofmethanecoupledwithextracellularelectrontransfertoelectrodes AT jangholee anaerobicoxidationofmethanecoupledwithextracellularelectrontransfertoelectrodes AT joshdneufeld anaerobicoxidationofmethanecoupledwithextracellularelectrontransfertoelectrodes AT joonhongpark anaerobicoxidationofmethanecoupledwithextracellularelectrontransfertoelectrodes AT bruceerittmann anaerobicoxidationofmethanecoupledwithextracellularelectrontransfertoelectrodes AT hyungsoollee anaerobicoxidationofmethanecoupledwithextracellularelectrontransfertoelectrodes
_version_	1718388807400685568

Anaerobic oxidation of methane coupled with extracellular electron transfer to electrodes

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