Reconstructing a hydrogen-driven microbial metabolic network in Opalinus Clay rock
- Ecole Polytechnique Federale Lausanne (Switzlerland). Environmental Microbiology Lab.
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
- Bioinformatics Infrastructure for Life Sciences (BILS), Stockholm (Sweden); KTH Royal Inst. of Technology, Stockholm (Sweden). School of Biotechnology, Division of Gene Technology, Science for Life Lab.
- KTH Royal Inst. of Technology, Stockholm (Sweden). School of Biotechnology, Division of Gene Technology, Science for Life Lab.
- National Cooperative for the Disposal of Radioactive Waste (Nagra), Wettingen (Switzerland)
A significant fraction (~ 20%) of microbial life is found in the terrestrial deep subsurface, yet the metabolic processes extant in those environments are poorly understood. Here we show that H2, injected into the Opalinus Clay formation in a borehole located 300 meters below the surface, fuels a community of microorganisms with interconnected metabolisms. Metagenomic binning and metaproteomic analysis reveal a complete carbon cycle, driven by autotrophic hydrogen oxidizers. Dead biomass from these organisms is a substrate for a fermenting bacterium that produces acetate as a product. In turn, complete oxidizer heterotrophic sulfate- reducing bacteria utilize acetate and oxidize it to CO2, closing the cycle. This metabolic reconstruction sheds light onto a hydrogen-driven carbon cycle, and a sunlight-independent ecosystem in the deep subsurface.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); Swedish Research Council (SRC)
- Grant/Contract Number:
- AC05-00OR22725; AC02-05CH11231; CSP 1505; 2011-5689
- OSTI ID:
- 1352739
- Journal Information:
- Nature Communications, Vol. 7, Issue 10; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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