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A methanotrophic archaeon couples anaerobic oxidation of methane to Fe(III) reduction

The ISME Journal, 2018-08, Vol.12 (8), p.1929-1939 [Peer Reviewed Journal]

Copyright Nature Publishing Group Aug 2018 ;International Society for Microbial Ecology 2018 ;ISSN: 1751-7362 ;EISSN: 1751-7370 ;DOI: 10.1038/s41396-018-0109-x ;PMID: 29662147

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  • Title:
    A methanotrophic archaeon couples anaerobic oxidation of methane to Fe(III) reduction
  • Author: Cai, Chen ; Leu, Andy O ; Xie, Guo-Jun ; Guo, Jianhua ; Feng, Yuexing ; Zhao, Jian-Xin ; Tyson, Gene W ; Yuan, Zhiguo ; Hu, Shihu
  • Subjects: Anaerobic processes ; Archaea ; Bioreactors ; Candidatus Methanoperedenaceae ; Carbon cycle ; Cytochromes ; Environmental Sciences & Ecology ; Genes ; Heme ; Iron ; Iron 57 ; Labelling ; Metabolic pathways ; Methane ; Methanogenesis ; Microbiology ; Oxidation ; Reduction
  • Is Part Of: The ISME Journal, 2018-08, Vol.12 (8), p.1929-1939
  • Description: 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 C- and 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: England: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 1751-7362
    EISSN: 1751-7370
    DOI: 10.1038/s41396-018-0109-x
    PMID: 29662147
  • Source: PubMed Central database
    ProQuest Central
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