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Sulfate-dependent reversibility of intracellular reactions explains the opposing isotope effects in the anaerobic oxidation of methane
The anaerobic oxidation of methane (AOM) is performed by methanotrophic archaea (ANME) in distinct sulfate-methane interfaces of marine sediments. In these interfaces, AOM often appears to deplete methane in the heavy isotopes toward isotopic compositions similar to methanogenesis. Here, we shed lig...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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American Association for the Advancement of Science
2021
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8099194/ https://www.ncbi.nlm.nih.gov/pubmed/33952515 http://dx.doi.org/10.1126/sciadv.abe4939 |
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author | Wegener, Gunter Gropp, Jonathan Taubner, Heidi Halevy, Itay Elvert, Marcus |
author_facet | Wegener, Gunter Gropp, Jonathan Taubner, Heidi Halevy, Itay Elvert, Marcus |
author_sort | Wegener, Gunter |
collection | PubMed |
description | The anaerobic oxidation of methane (AOM) is performed by methanotrophic archaea (ANME) in distinct sulfate-methane interfaces of marine sediments. In these interfaces, AOM often appears to deplete methane in the heavy isotopes toward isotopic compositions similar to methanogenesis. Here, we shed light on this effect and its physiological underpinnings using a thermophilic ANME-1–dominated culture. At high sulfate concentrations, residual methane is enriched in both (13)C and (2)H ((13)α = 1.016 and (2)α = 1.155), as observed previously. In contrast, at low sulfate concentrations, the residual methane is substantially depleted in (13)C ((13)α = 0.977) and, to a lesser extent, in (2)H. Using a biochemical-isotopic model, we explain the sulfate dependence of the net isotopic fractionation through the thermodynamic drive of the involved intracellular reactions. Our findings relate these isotopic patterns to the physiology and environment of the ANME, thereby explaining a commonly observed isotopic enigma. |
format | Online Article Text |
id | pubmed-8099194 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-80991942021-05-14 Sulfate-dependent reversibility of intracellular reactions explains the opposing isotope effects in the anaerobic oxidation of methane Wegener, Gunter Gropp, Jonathan Taubner, Heidi Halevy, Itay Elvert, Marcus Sci Adv Research Articles The anaerobic oxidation of methane (AOM) is performed by methanotrophic archaea (ANME) in distinct sulfate-methane interfaces of marine sediments. In these interfaces, AOM often appears to deplete methane in the heavy isotopes toward isotopic compositions similar to methanogenesis. Here, we shed light on this effect and its physiological underpinnings using a thermophilic ANME-1–dominated culture. At high sulfate concentrations, residual methane is enriched in both (13)C and (2)H ((13)α = 1.016 and (2)α = 1.155), as observed previously. In contrast, at low sulfate concentrations, the residual methane is substantially depleted in (13)C ((13)α = 0.977) and, to a lesser extent, in (2)H. Using a biochemical-isotopic model, we explain the sulfate dependence of the net isotopic fractionation through the thermodynamic drive of the involved intracellular reactions. Our findings relate these isotopic patterns to the physiology and environment of the ANME, thereby explaining a commonly observed isotopic enigma. American Association for the Advancement of Science 2021-05-05 /pmc/articles/PMC8099194/ /pubmed/33952515 http://dx.doi.org/10.1126/sciadv.abe4939 Text en Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
spellingShingle | Research Articles Wegener, Gunter Gropp, Jonathan Taubner, Heidi Halevy, Itay Elvert, Marcus Sulfate-dependent reversibility of intracellular reactions explains the opposing isotope effects in the anaerobic oxidation of methane |
title | Sulfate-dependent reversibility of intracellular reactions explains the opposing isotope effects in the anaerobic oxidation of methane |
title_full | Sulfate-dependent reversibility of intracellular reactions explains the opposing isotope effects in the anaerobic oxidation of methane |
title_fullStr | Sulfate-dependent reversibility of intracellular reactions explains the opposing isotope effects in the anaerobic oxidation of methane |
title_full_unstemmed | Sulfate-dependent reversibility of intracellular reactions explains the opposing isotope effects in the anaerobic oxidation of methane |
title_short | Sulfate-dependent reversibility of intracellular reactions explains the opposing isotope effects in the anaerobic oxidation of methane |
title_sort | sulfate-dependent reversibility of intracellular reactions explains the opposing isotope effects in the anaerobic oxidation of methane |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8099194/ https://www.ncbi.nlm.nih.gov/pubmed/33952515 http://dx.doi.org/10.1126/sciadv.abe4939 |
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