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Title: A biochemical framework for anaerobic oxidation of methane driven by Fe(III)-dependent respiration

Journal Article · · Nature Communications
 [1]; ORCiD logo [2];  [2];  [1]
  1. Pennsylvania State Univ., University Park, PA (United States). Dept of Biochemistry and Molecular Biology
  2. Pennsylvania State Univ., University Park, PA (United States). Dept of Civil and Environmental Engineering

Consumption of methane by aerobic and anaerobic microbes governs the atmospheric level of this powerful greenhouse gas. Whereas a biochemical understanding of aerobic methanotrophy is well developed, a mechanistic understanding of anaerobic methanotrophy has been prevented by the unavailability of pure cultures. Here we report a biochemical investigation of Methanosarcina acetivorans, a methane-producing species capable of anaerobic methanotrophic growth dependent on reduction of Fe(III). Our findings support a pathway anchored by Fe(III)-dependent mechanisms for energy conservation driving endergonic reactions that are key to methanotrophic growth. The pathway is remarkably similar to pathways hypothesized for uncultured anaerobic methanotrophic archaea. The results contribute to an improved understanding of the methane cycle that is paramount to understanding human interventions influencing Earth’s climate. Finally, the pathway enables advanced development and optimization of biotechnologies converting methane to value-added products through metabolic engineering of M. acetivorans.

Research Organization:
Pennsylvania State Univ, University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-95ER20198
OSTI ID:
1529924
Journal Information:
Nature Communications, Vol. 9, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 73 works
Citation information provided by
Web of Science

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Cited By (12)

Petrographical and Geochemical Signatures Linked to Fe/Mn Reduction in Subsurface Marine Sediments from the Hydrate-Bearing Area, Dongsha, the South China Sea journal October 2019
Evidence for microbial iron reduction in the methanic sediments of the oligotrophic southeastern Mediterranean continental shelf journal January 2019
Molecular underpinnings for microbial extracellular electron transfer during biogeochemical cycling of earth elements journal March 2019
A New Approach to Assess the Effect of Various Humic Compounds on the Metabolic Activity of Cells Participating in Methanogenesis journal June 2019
Anaerobic Bacterial Immobilization and Removal of Toxic Sb(III) Coupled With Fe(II)/Sb(III) Oxidation and Denitrification journal February 2019
Electron Bifurcation and Confurcation in Methanogenesis and Reverse Methanogenesis journal June 2018
Metal-dependent anaerobic methane oxidation in marine sediment: Insights from marine settings and other systems journal June 2019
Redox cycling of Fe(II) and Fe(III) in magnetite accelerates aceticlastic methanogenesis by Methanosarcina mazei journal October 2019
Vivianite formation in methane-rich deep-sea sediments from the South China Sea journal January 2018
Vertical stratification of bacteria and archaea in sediments of a small boreal humic lake journal February 2019
Stimulation of Smithella ‐dominating propionate oxidation in a sediment enrichment by magnetite and carbon nanotubes journal March 2019
Life on the thermodynamic edge: Respiratory growth of an acetotrophic methanogen journal August 2019

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