Format

Send to

Choose Destination
ISME J. 2020 Jan 27. doi: 10.1038/s41396-020-0590-x. [Epub ahead of print]

Anaerobic methane oxidation coupled to manganese reduction by members of the Methanoperedenaceae.

Author information

1
Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia.
2
Advanced Water Management Centre, Faculty of Engineering, Architecture and Information Technology, The University of Queensland, Brisbane, QLD, Australia.
3
School of Earth & Environmental Sciences, The University of Queensland, Brisbane, QLD, 4072, Australia.
4
Department of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, 91106, USA.
5
Advanced Water Management Centre, Faculty of Engineering, Architecture and Information Technology, The University of Queensland, Brisbane, QLD, Australia. s.hu@awmc.uq.edu.au.
6
Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD, Australia. g.tyson@uq.edu.au.

Abstract

Anaerobic oxidation of methane (AOM) is a major biological process that reduces global methane emission to the atmosphere. Anaerobic methanotrophic archaea (ANME) mediate this process through the coupling of methane oxidation to different electron acceptors, or in concert with a syntrophic bacterial partner. Recently, ANME belonging to the archaeal family Methanoperedenaceae (formerly known as ANME-2d) were shown to be capable of AOM coupled to nitrate and iron reduction. Here, a freshwater sediment bioreactor fed with methane and Mn(IV) oxides (birnessite) resulted in a microbial community dominated by two novel members of the Methanoperedenaceae, with biochemical profiling of the system demonstrating Mn(IV)-dependent AOM. Genomic and transcriptomic analyses revealed the expression of key genes involved in methane oxidation and several shared multiheme c-type cytochromes (MHCs) that were differentially expressed, indicating the likely use of different extracellular electron transfer pathways. We propose the names "Candidatus Methanoperedens manganicus" and "Candidatus Methanoperedens manganireducens" for the two newly described Methanoperedenaceae species. This study demonstrates the ability of members of the Methanoperedenaceae to couple AOM to the reduction of Mn(IV) oxides, which suggests their potential role in linking methane and manganese cycling in the environment.

PMID:
31988473
DOI:
10.1038/s41396-020-0590-x

Supplemental Content

Full text links

Icon for Nature Publishing Group
Loading ...
Support Center