Thermotogales

Abstract

Members of the order Thermotogales have an outstanding phylogenetic position within the domain Bacteria, based on their 16S rRNA (ribosomal ribonucleic acid) genes sequences. Some Thermotogales organisms are hyperthermophiles with the upper temperature limit of growth at 90°C whereas others are extreme or moderate thermophiles. All Thermotogales are obligately anaerobic organotrophs with a fermentative metabolism. Many thermostable enzymes of Thermotogales were characterized and could be used in different fields of biotechnology.

Keywords: Thermotogales; Thermotoga; bacteria; thermophiles; evolution

Figure 1.

Schematic 16S rRNA tree of the domain Bacteria showing the position of the order Thermotogales. Modified from Reysenbach et al..

Figure 2.

Phylogenetic position of species within the order Thermotogales. Modified from Alain et al..

Figure 3.

Electron micrograph of a platinum‐shadowed, single flagellated cell of Thermotoga maritima. Arrows point to the sheath‐like outer structure (‘toga’). Bar, 1 μm.

Figure 4.

Electron micrograph of Thermosipho africanus, showing four cells within a tube‐like sheath. Bar, 1 μm.

Figure 5.

Electron micrograph of a thin section of Fervidobacterium islandicum. Arrow points to the terminal bleb. Bar, 1 μm.

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References

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Further Reading

Adams MWW and Kelly RM (1995) Enzymes from microorganisms in extreme environments. Chemical & Engineering News 18: 32–42.

Bibel M, Brettl C, Gosslar U, Kriegshauser G and Liebl W (1998) Isolation and analysis of genes for amylolytic enzymes of the hyperthermophilic bacterium Thermotoga maritima. FEMS Microbiology Letters 158: 9–15.

Jannasch HW (1997) Small is powerful: recollections of a microbiologist and oceanographer. Annual Reviews of Microbiology 52: 1–45.

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Ravot G, Ollivier B, Fardeau ML et al. (1996) l‐alanine production from glucose fermentation by hyperthermophilic members of the domains Bacteria and Archaea: a remnant of ancestral metabolism. Applied and Environmental Microbiology 62: 2657–2659.

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Yu JS and Noll KM (1997) Plasmid pRQ7 from the hyperthermophilic bacterium Thermotoga species RQ7 replicates by the rolling‐circle mechanism. Journal of Bacteriology 179: 7161–7164.

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How to Cite close
Bonch‐Osmolovskaya, Elizaveta(Dec 2008) Thermotogales. In: eLS. John Wiley & Sons Ltd, Chichester. http://www.els.net [doi: 10.1002/9780470015902.a0000467.pub2]