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A methanotrophic archaeon couples anaerobic oxidation of methane to Fe(III) reduction
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A methanotrophic archaeon couples anaerobic oxidation of methane to Fe(III) reduction
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Journal Article
A methanotrophic archaeon couples anaerobic oxidation of methane to Fe(III) reduction
2018
Overview
Microbially mediated anaerobic oxidation of methane (AOM) is a key process in the regulation of methane emissions to the atmosphere. Iron can serve as an electron acceptor for AOM, and it has been suggested that Fe(III)-dependent AOM potentially comprises a major global methane sink. Although it has been proposed that anaerobic methanotrophic (ANME) archaea can facilitate this process, their active metabolic pathways have not been confirmed. Here we report the enrichment and characterisation of a novel archaeon in a laboratory-scale bioreactor fed with Fe(III) oxide (ferrihydrite) and methane. Long-term performance data, in conjunction with the
13
C- and
57
Fe-labelling batch experiments, demonstrated that AOM was coupled to Fe(III) reduction to Fe(II) in this bioreactor. Metagenomic analysis showed that this archaeon belongs to a novel genus within family
Candidatus Methanoperedenaceae
, and possesses genes encoding the “reverse methanogenesis” pathway, as well as multi-heme
c
-type cytochromes which are hypothesised to facilitate dissimilatory Fe(III) reduction. Metatranscriptomic analysis revealed upregulation of these genes, supporting that this archaeon can independently mediate AOM using Fe(III) as the terminal electron acceptor. We propose the name
Candidatus
“
Methanoperedens ferrireducens
” for this microorganism. The potential role of “
M. ferrireducens
” in linking the carbon and iron cycles in environments rich in methane and iron should be investigated in future research.
Publisher
Nature Publishing Group UK,Oxford University Press,Nature Publishing Group
Subject
/ 45/22
/ 45/23
/ 45/77
/ 45/90
/ 45/91
/ Archaea
/ Biomedical and Life Sciences
/ Candidatus Methanoperedenaceae
/ Ecology
/ Environmental Sciences & Ecology
/ Ferric Compounds - metabolism
/ Genes
/ Heme
/ Iron
/ Iron 57
/ Labeling
/ Methane
/ Methanosarcinales - metabolism
