Abstract
A novel sulfate-reducing bacterium designated OPF15T was isolated from Obsidian Pool, Yellowstone National Park, Wyoming. The phylogeny of 16S rRNA and functional genes (dsrAB) placed the organism within the family Thermodesulfobacteriaceae. The organism displayed hyperthermophilic temperature requirements for growth with a range of 70–90 °C and an optimum of 83 °C. Optimal pH was around 6.5–7.0 and the organism required the presence of H2 or formate as an electron donor and CO2 as a carbon source. Electron acceptors supporting growth included sulfate, thiosulfate, and elemental sulfur. Lactate, acetate, pyruvate, benzoate, oleic acid, and ethanol did not serve as electron donors. Membrane lipid analysis revealed diacyl glycerols and acyl/ether glycerols which ranged from C14:0 to C20:0. Alkyl chains present in acyl/ether and diether glycerol lipids ranged from C16:0 to C18:0. Straight, iso- and anteiso-configurations were found for all lipid types. The presence of OPF15T was also shown to increase cellulose consumption during co-cultivation with Caldicellulosiruptor obsidiansis, a fermentative, cellulolytic extreme thermophile isolated from the same environment. On the basis of phylogenetic, phenotypic, and structural analyses, Thermodesulfobacterium geofontis sp. nov. is proposed as a new species with OPF15T representing the type strain.
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Abbreviations
- DSR:
-
Dissimilatory sulfite reductase
- SRM:
-
Sulfate-reducing microorganisms
- YNP:
-
Yellowstone National Park
- OP:
-
Obsidian Pool
- IPLs:
-
Intact polar lipids
- PE:
-
Phosphoethanolamine
- APT:
-
Phosphoaminopentanetetrol
- Phex:
-
Phosphohexose
- DAG:
-
Diacyl glycerol
- AEG:
-
Acyl/ether glycerol
- DEG:
-
Diether glycerol
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Acknowledgments
We thank Sarah J. Kauffman for her invaluable technical assistance. We also thank Brian P. Hedlund, Christie Hendrix, and the National Park Service for sample collection under permit #YELL-SCI-0115 (PI: Karl O. Stetter). Christopher W. Schadt and Dwayne A. Elias provided helpful comments during preparation of the manuscript. Support for S. D. H.-B. and J. G. E. was provided by the BioEnergy Science Center (BESC), which is a U.S. Department of Energy Bioenergy Research Center supported by the Office of Biological and Environmental Research in the DOE Office of Science, Oak Ridge National Laboratory. Oak Ridge National Laboratory is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725. The research was partially funded by the Netherlands Darwin Centre for Biogeosciences by a grant for a post-doctoral fellowship (R.A.G.) to J.S.S.D.
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Hamilton-Brehm, S.D., Gibson, R.A., Green, S.J. et al. Thermodesulfobacterium geofontis sp. nov., a hyperthermophilic, sulfate-reducing bacterium isolated from Obsidian Pool, Yellowstone National Park. Extremophiles 17, 251–263 (2013). https://doi.org/10.1007/s00792-013-0512-1
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DOI: https://doi.org/10.1007/s00792-013-0512-1