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Ecological and genomic profiling of anaerobic methane-oxidizing archaea in a deep granitic environment
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Ecological and genomic profiling of anaerobic methane-oxidizing archaea in a deep granitic environment
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Journal Article
Ecological and genomic profiling of anaerobic methane-oxidizing archaea in a deep granitic environment
2018
Overview
Recent single-gene-based surveys of deep continental aquifers demonstrated the widespread occurrence of archaea related to
Candidatus
Methanoperedens nitroreducens (ANME-2d) known to mediate anaerobic oxidation of methane (AOM). However, it is unclear whether ANME-2d mediates AOM in the deep continental biosphere. In this study, we found the dominance of ANME-2d in groundwater enriched in sulfate and methane from a 300-m deep underground borehole in granitic rock. A near-complete genome of one representative species of the ANME-2d obtained from the underground borehole has most of functional genes required for AOM and assimilatory sulfate reduction. The genome of the subsurface ANME-2d is different from those of other members of ANME-2d by lacking functional genes encoding nitrate and nitrite reductases and multiheme cytochromes. In addition, the subsurface ANME-2d genome contains a membrane-bound NiFe hydrogenase gene putatively involved in respiratory H
2
oxidation, which is different from those of other methanotrophic archaea. Short-term incubation of microbial cells collected from the granitic groundwater with
13
C-labeled methane also demonstrates that AOM is linked to microbial sulfate reduction. Given the prominence of granitic continental crust and sulfate and methane in terrestrial subsurface fluids, we conclude that AOM may be widespread in the deep continental biosphere.
Publisher
Nature Publishing Group UK,Oxford University Press,Nature Publishing Group
Subject
/ 45
/ 704/47
/ Aquifers
/ Archaea
/ Biomedical and Life Sciences
/ Candidatus Methanoperedens nitroreducens
/ Ecology
/ Genes
/ Genomes
/ Genomics
/ Methane
/ Methanosarcinales - classification
/ Methanosarcinales - genetics
/ Methanosarcinales - isolation & purification
/ Methanosarcinales - metabolism
/ Microbial Genetics and Genomics
/ Original
/ Silicon Dioxide - metabolism
/ Sulfates
