Electron shuttles enhance anaerobic oxidation of methane coupled to iron(III) reduction

Quinones, redox-active functional groups in soil organic matter, can act as electron shuttles for microbial anaerobic transformation. Here, we used 13CH4 to trace 13C conversion (13C-CO2 + 13C-SOC) to investigate the influence of an artificial electron shuttle (anthraquinone-2,6-disulfonate, AQDS) on denitrifying anaerobic methane oxidation (DAMO) in paddy soil. The results showed that AQDS could act as the terminal electron acceptor for the anaerobic oxidation of methane (AOM) in the paddy field. Moreover, AQDS significantly enhanced nitrate-dependent AOM rates and the amount of 13C-CH4 assimilation to soil organic carbon (SOC), whereas it was remarkably reduced nitrite-dependent AOM rates and 13C assimilation. Ultimately, AQDS notably increased the total DAMO rates and 13C assimilation to SOC. However, the electron shuttle did not change the percentage of 13C-SOC in total 13C-CH4 conversion. These results suggest that electron shuttles in the natural organic matter might be able to offset methane emission by facilitating AOM coupled with the denitrification process.

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Faculty Opinions recommendation of The key nickel enzyme of methanogenesis catalyses the anaerobic oxidation of methane.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.3600957.4174054 ◽

2010 ◽

Author(s):

Wolfgang Buckel

Keyword(s):

Anaerobic Oxidation Of Methane ◽

Anaerobic Oxidation ◽

Oxidation Of Methane ◽

Nickel Enzyme

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Simultaneous nitrate and sulfate dependent anaerobic oxidation of methane linking carbon, nitrogen and sulfur cycles

Water Research ◽

10.1016/j.watres.2021.116928 ◽

2021 ◽

Vol 194 ◽

pp. 116928

Author(s):

Wen-Bo Nie ◽

Jie Ding ◽

Guo-Jun Xie ◽

Xin Tan ◽

Yang Lu ◽

...

Keyword(s):

Anaerobic Oxidation Of Methane ◽

Anaerobic Oxidation ◽

Oxidation Of Methane

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Can anaerobic oxidation of methane prevent seafloor gas escape in a warming climate?

Solid Earth ◽

10.5194/se-10-1541-2019 ◽

2019 ◽

Vol 10 (5) ◽

pp. 1541-1554 ◽

Cited By ~ 2

Author(s):

Christian Stranne ◽

Matt O'Regan ◽

Martin Jakobsson ◽

Volker Brüchert ◽

Marcelo Ketzer

Keyword(s):

Climate Warming ◽

Future Climate ◽

Hydraulic Fractures ◽

Anaerobic Oxidation Of Methane ◽

Anaerobic Oxidation ◽

Warming Scenario ◽

Oxidation Of Methane ◽

Warming Climate ◽

Continental Slopes ◽

Fully Coupled

Abstract. Assessments of future climate-warming-induced seafloor methane (CH4) release rarely include anaerobic oxidation of methane (AOM) within the sediments. Considering that more than 90 % of the CH4 produced in ocean sediments today is consumed by AOM, this may result in substantial overestimations of future seafloor CH4 release. Here, we integrate a fully coupled AOM module with a numerical hydrate model to investigate under what conditions rapid release of CH4 can bypass AOM and result in significant fluxes to the ocean and atmosphere. We run a number of different model simulations for different permeabilities and maximum AOM rates. In all simulations, a future climate warming scenario is simulated by imposing a linear seafloor temperature increase of 3 ∘C over the first 100 years. The results presented in this study should be seen as a first step towards understanding AOM dynamics in relation to climate change and hydrate dissociation. Although the model is somewhat poorly constrained, our results indicate that vertical CH4 migration through hydraulic fractures can result in low AOM efficiencies. Fracture flow is the predicted mode of methane transport under warming-induced dissociation of hydrates on upper continental slopes. Therefore, in a future climate warming scenario, AOM might not significantly reduce methane release from marine sediments.

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Archaeal lipids and anaerobic oxidation of methane in euxinic water columns: a comparative study of the Black Sea and Cariaco Basin

Chemical Geology ◽

10.1016/j.chemgeo.2003.12.024 ◽

2004 ◽

Vol 205 (3-4) ◽

pp. 427-442 ◽

Cited By ~ 41

Author(s):

Stuart G Wakeham ◽

Ellen C Hopmans ◽

Stefan Schouten ◽

Jaap S Sinninghe Damsté

Keyword(s):

Comparative Study ◽

Black Sea ◽

Cariaco Basin ◽

The Black Sea ◽

Anaerobic Oxidation Of Methane ◽

Anaerobic Oxidation ◽

Oxidation Of Methane ◽

Water Columns ◽

Archaeal Lipids

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Effects of Temperature and Pressure on Sulfate Reduction and Anaerobic Oxidation of Methane in Hydrothermal Sediments of Guaymas Basin

Applied and Environmental Microbiology ◽

10.1128/aem.70.2.1231-1233.2004 ◽

2004 ◽

Vol 70 (2) ◽

pp. 1231-1233 ◽

Cited By ~ 101

Author(s):

Jens Kallmeyer ◽

Antje Boetius

Keyword(s):

Sulfate Reduction ◽

Deep Sea ◽

Anaerobic Oxidation Of Methane ◽

Anaerobic Oxidation ◽

Guaymas Basin ◽

Oxidation Of Methane ◽

Hydrothermal Sediments ◽

Deep Sea Sediments ◽

Effects Of Temperature ◽

Temperature And Pressure

ABSTRACT Rates of sulfate reduction (SR) and anaerobic oxidation of methane (AOM) in hydrothermal deep-sea sediments from Guaymas Basin were measured at temperatures of 5 to 200°C and pressures of 1 × 105, 2.2 × 107, and 4.5 × 107 Pa. A maximum SR of several micromoles per cubic centimeter per day was found at between 60 and 95°C and 2.2 × 107 and 4.5 × 107 Pa. Maximal AOM was observed at 35 to 90°C but generally accounted for less than 5% of SR.

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