Ferroglobus
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F. placidus Hafenbradl et al., 1997 |
Ferroglobus is a hyperthermophilic genus phylogenetically located within the Euryarchaeota. It consists of one species, F. placidus, isolated from hydrothermal vent sediment off the coast of Italy. F. placidus grows best at 85ºC and a neutral pH. It cannot grow at temperatures below 65ºC or above 95ºC. Cells possess an S-layer cell wall and flagella.
Metabolically, Ferroglobus is quite unique compared to its relative Archaeoglobus. F. placidus was the first hyperthermophile discovered to grow anaerobically by oxidizing aromatic compounds such as benzoate coupled to the reduction of ferric iron (Fe3+) to ferrous iron (Fe2+). Hydrogen gas (H2) and sulfide (H2S) can also be used as energy sources. Due to its anaerobic lifestyle, nitrate (NO3-) is used as a terminal electron acceptor whereby it is converted to nitrite (NO2-). Thiosulfate (S2O32-) can also be used as a terminal electron acceptor. F. placidus was the first archaeon discovered that can anaerobically oxidize iron coupled to the reduction of nitrate. It is thought that the presence of organisms similar to F. placidus in the ancient, anoxic Earth may have led to the formation of banded iron formations often found in ancient rocks.
[edit] References
- Hafenbradl, D., Keller, M., Dirmeier, R., Rachel, R., Roßnagel, P., Burggraf, S., Huber, H. and Stetter, K.O. (1996). "Ferroglobus placidus gen. nov., sp. nov., a novel hyperthermophilic archaeum that oxidizes Fe2+ at neutral pH under anoxic conditions". Archives of Microbiology 166: 308-314.
- Madigan, M.T. and Martinko, J.M. (2005). Brock Biology of Microorganisms, 11th Ed.. Pearson Prentice Hall.
- Tor, J.M., Kashefi, K., and Lovley, D.R. (2001). "Acetate oxidation coupled to Fe(III) reduction in hyperthermophilic microorganisms". Applied and Environmental Microbiology 67: 1363-1365.
- Tor, J.M., and Lovley, D.R. (2001). "Anaerobic degradation of aromatic compounds coupled to Fe(III) reduction by Ferroglobus placidus". Environmental Microbiology 3: 281-287.
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