| Deinococcus-Thermus |
| Scientific classification |
| Domain: |
Bacteria |
| Phylum: |
Deinococcus-Thermus |
| Class: |
Deinococci
Garrity and Holt 2002 |
| Orders & Genera |
|
Deinococcales Rainey et al. 1997
Deinococcaceae Brooks and Murray 1981 emend. Rainey et al. 1997
Deinococcus Brooks and Murray 1981 emend. Rainey et al. 1997
Deinobacterium Ekman et al. 2011
Trueperaceae Rainey et al. 2005
Truepera da Costa, Rainey and Albuquerque 2005
Thermales Rainey and Da Costa 2002
Thermaceae Da Costa and Rainey 2002
Thermus Brock and Freeze 1969 emend. Nobre et al. 1996
Meiothermus Nobre et al. 1996 emend. Albuquerque et al. 2009
Marinithermus Sako et al. 2003
Oceanithermus Miroshnichenko et al. 2003 emend. Mori et al. 2004
Rhabdothermus Steinsbu et al. 2011
Vulcanithermus Miroshnichenko et al. 2003
|
| Synonyms |
- Hadobacteria Cavalier-Smith 1992 emend. Cavalier-Smith 1998
- Xenobacteria
|
The Deinococcus-Thermus are a small group of bacteria composed of cocci[citation needed] highly resistant to environmental hazards.[1]
There are two main groups.
- The Deinococcales include two families, with three genera, Deinococcus and Truepera, the former with several species that are resistant to radiation; they have become famous for their ability to eat nuclear waste and other toxic materials, survive in the vacuum of space and survive extremes of heat and cold.
- The Thermales include several genera resistant to heat (Marinithermus, Meiothermus, Oceanithermus, Thermus, Vulcanithermus).[2] Thermus aquaticus was important in the development of the polymerase chain reaction where repeated cycles of heating DNA to near boiling make it advantageous to use a thermo-stable DNA polymerase enzyme.
Though these two groups evolved from a common ancestor, the two mechanisms of resistance appear to be largely independent.[3]
These bacteria have thick cell walls that give them gram-positive stains, but they include a second membrane and so are closer in structure to those of gram-negative bacteria.
Cavalier-Smith calls this clade Hadobacteria[4] (from Hades, the Greek underworld).
Phylogeny
The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) [5] and National Center for Biotechnology Information (NCBI)[6] and the phylogeny is based on 16S rRNA-based LTP release 106 by 'The All-Species Living Tree' Project [7]
Note:
♠ Strains found at the National Center for Biotechnology Information (NCBI) but not listed in the List of Prokaryotic names with Standing in Nomenclature (LSPN)
Sequenced genomes
Currently there are 10 sequenced genomes of strains in this phylum.[8]
- Deinococcus radiodurans R1
- Thermus thermophilus HB27
- Thermus thermophilus HB8
- Deinococcus geothermalis DSM 11300
- Deinococcus deserti VCD115
- Meiothermus ruber DSM 1279
- Meiothermus silvanus DSM 9946
- Truepera radiovictrix DSM 17093
- Oceanithermus profundus DSM 14977
The two Meiothermus sp. were sequenced under the auspices of the Genomic Encyclopedia of Bacteria and Archaea project (GEBA), which aims at sequencing organisms based on phylogenetic novelty and not on pathologenicity or notoriety.[9] Currently, the genome of Thermus aquaticus Y51MC23 is in the final stages of assembly by the DOE Joint Genome Institute [10]
References
- ^ Griffiths E, Gupta RS (September 2007). "Identification of signature proteins that are distinctive of the Deinococcus-Thermus phylum". Int. Microbiol. 10 (3): 201–8. PMID 18076002. http://www.im.microbios.org/1003/1003201.pdf.
- ^ http://www.bacterio.cict.fr/classifphyla.html#DeinococcusThermus
- ^ Omelchenko MV, Wolf YI, Gaidamakova EK, et al (2005). "Comparative genomics of Thermus thermophilus and Deinococcus radiodurans: divergent routes of adaptation to thermophily and radiation resistance". BMC Evol. Biol. 5: 57. DOI:10.1186/1471-2148-5-57. PMC 1274311. PMID 16242020. http://www.biomedcentral.com/1471-2148/5/57.
- ^ Cavalier-Smith T (2006). "Rooting the tree of life by transition analyses". Biol. Direct 1: 19. DOI:10.1186/1745-6150-1-19. PMC 1586193. PMID 16834776. http://www.biology-direct.com/content/1//19.
- ^ J.P. Euzéby. "Deinococcus-Thermus". List of Prokaryotic names with Standing in Nomenclature (LPSN) [1]. http://www.bacterio.cict.fr/classifphyla.html#Deinococcus-Thermus. Retrieved 2011-11-17.
- ^ Sayers et al.. "Deinococcus-Thermus". National Center for Biotechnology Information (NCBI) taxonomy database [2]. http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Undef&id=1297&lvl=6&lin. Retrieved 2011-06-05.
- ^ 'The All-Species Living Tree' Project."16S rRNA-based LTP release 106 (full tree)". Silva Comprehensive Ribosomal RNA Database [3]. http://www.arb-silva.de/fileadmin/silva_databases/living_tree/LTP_release_106/LTPs106_SSU_tree.pdf. Retrieved 2011-11-17.
- ^ http://www.ncbi.nlm.nih.gov/genomes/MICROBES/microbial_taxtree.html
- ^ Wu, D.; Hugenholtz, P.; Mavromatis, K.; Pukall, R. �D.; Dalin, E.; Ivanova, N. N.; Kunin, V.; Goodwin, L. et al. (2009). "A phylogeny-driven genomic encyclopaedia of Bacteria and Archaea". Nature 462 (7276): 1056–1060. Bibcode 2009Natur.462.1056W. DOI:10.1038/nature08656. PMC 3073058. PMID 20033048. //www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=3073058. edit
- ^ http://www.ncbi.nlm.nih.gov/genomeprj/55053
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| Types |
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Notable
extremophiles |
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| Related articles |
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