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An evolving view of methane metabolism in the Archaea

Journal Article · · Nature Reviews Microbiology
Methane is a key compound in the global carbon cycle that influences both nutrient cycling and the Earth’s climate. A limited number of microorganisms control the flux of biologically generated methane, including methane-metabolizing archaea that either produce or consume methane. Methanogenic and methanotrophic archaea belonging to the phylum Euryarchaeota share a genetically similar, interrelated pathway for methane metabolism. The key enzyme in this pathway, the methyl-coenzyme M reductase (Mcr) complex, catalyses the last step in methanogenesis and the first step in methanotrophy. Here, the discovery of mcr and divergent mcr-like genes in new euryarchaeotal lineages and novel archaeal phyla challenges long-held views of the evolutionary origin of this metabolism within the Euryarchaeota. Divergent mcr-like genes have recently been shown to oxidize short-chain alkanes, indicating that these complexes have evolved to metabolize substrates other than methane. In this Review, we examine the diversity, metabolism and evolutionary history of mcr-containing archaea in light of these recent discoveries.
Research Organization:
Univ. of Queensland, St. Lucia, QLD (Australia)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
DOE Contract Number:
SC0016440
OSTI ID:
1856863
Journal Information:
Nature Reviews Microbiology, Journal Name: Nature Reviews Microbiology Journal Issue: 4 Vol. 17; ISSN 1740-1526
Publisher:
Springer Nature
Country of Publication:
United States
Language:
English

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  • International Journal of Systematic and Evolutionary Microbiology, Vol. 65, Issue 4 https://doi.org/10.1099/ijs.0.000065
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