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Co-occurring genomic capacity for anaerobic methane and dissimilatory sulfur metabolisms discovered in the Korarchaeota

Journal Article · · Nature Microbiology
 [1];  [2];  [3];  [4];  [5];  [6];  [6];  [7];  [8]
  1. Montana State Univ., Bozeman, MT (United States). Dept. of Land Resources and Environmental Sciences; Montana State Univ., Bozeman, MT (United States). Center for Biofilm Engineering
  2. Montana State Univ., Bozeman, MT (United States). Dept. of Microbiology and Immunology
  3. Montana State Univ., Bozeman, MT (United States). Center for Biofilm Engineering; Montana State Univ., Bozeman, MT (United States). Dept. of Microbiology and Immunology
  4. Univ. of Chicago, IL (United States). Dept. of Medicine
  5. Univ. of Chicago, IL (United States). Dept. of Medicine; Marine Biological Laboratory, Woods Hole, MA (United States). Josephine Bay Paul Center
  6. Montana State Univ., Bozeman, MT (United States). Center for Biofilm Engineering
  7. Indiana Univ., Bloomington, IN (United States). Informatics Group
  8. Montana State Univ., Bozeman, MT (United States). Dept. of Land Resources and Environmental Sciences; Montana State Univ., Bozeman, MT (United States). Thermal Biology Institute
Phylogenetic and geological evidence supports the hypothesis that life on Earth originated in thermal environments and conserved energy through methanogenesis or sulfur reduction. Here we describe two populations of the deeply rooted archaeal phylum Korarchaeota, which were retrieved from the metagenome of a circumneutral, suboxic hot spring that contains high levels of sulfate, sulfide, methane, hydrogen and carbon dioxide. One population is closely related to ‘Candidatus Korarchaeum cryptofilum OPF8’, while the more abundant korarchaeote, ‘Candidatus Methanodesulfokores washburnensis’, contains genes that are necessary for anaerobic methane and dissimilatory sulfur metabolisms. Phylogenetic and ancestral reconstruction analyses suggest that methane metabolism originated in the Korarchaeota, whereas genes for dissimilatory sulfite reduction were horizontally transferred to the Korarchaeota from the Firmicutes. Interactions among enzymes involved in both metabolisms could facilitate exergonic, sulfite-dependent, anaerobic oxidation of methane to methanol; alternatively, ‘Ca. M. washburnensis’ could conduct methanogenesis and sulfur reduction independently. Metabolic reconstruction suggests that ‘Ca. M. washburnensis’ is a mixotroph, capable of amino acid uptake, assimilation of methane-derived carbon and/or CO2 fixation by archaeal type III-b RuBisCO for scavenging ribose carbon. Our findings link anaerobic methane metabolism and dissimilatory sulfur reduction within a single deeply rooted archaeal population and have implications for the evolution of these traits throughout the Archaea.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1779059
Journal Information:
Nature Microbiology, Journal Name: Nature Microbiology Journal Issue: 4 Vol. 4; ISSN 2058-5276
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Metal-dependent anaerobic methane oxidation in marine sediment: Insights from marine settings and other systems journal June 2019
Insights into the ecological roles and evolution of methyl-coenzyme M reductase-containing hot spring Archaea journal October 2019
Wide diversity of methane and short-chain alkane metabolisms in uncultured archaea journal March 2019
Methylotrophic methanogens everywhere — physiology and ecology of novel players in global methane cycling journal December 2019
Physiology and Distribution of Archaeal Methanotrophs That Couple Anaerobic Oxidation of Methane with Sulfate Reduction journal July 2019

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