Deinococcus geothermalis

Deinococcus geothermalis is a bacterium. It produces orange-pigmented colonies and has an optimum growth temperature of about 45 °C (113 °F) to 50 °C (122 °F), which is the limit between mesophile and thermophile organisms. It is extremely gamma radiation-resistant. Its type strain is AG-3a (= DSM 11300).[1]

Deinococcus geothermalis
Scientific classification
Domain: Bacteria
Phylum: Deinococcota
Class: Deinococci
Order: Deinococcales
Family: Deinococcaceae
Genus: Deinococcus
Species:
D. geothermalis
Binomial name
Deinococcus geothermalis
Ferreira et al. 1997

A space mission called EXPOSE-R2 was launched on 24 July 2014 aboard the Russian Progress M-23M,[2] and was attached on 18 August 2014 outside the ISS on the Russian module Zvezda.[3] The two main experiments will test the resistance of a variety of extremophile microorganisms, including Deinococcus geothermalis to long-term exposure to outer space and to a Mars simulated environment.[4]

Genome structure

Deinococcus geothermalis has a genome that contains 2.47 Mbp with 2,335 protein coding genes. Additionally, it carries at least 2 plasmids.[5]

References
  1. Ferreira, A. C.; Nobre, M. F.; Rainey, F. A.; Silva, M. T.; Wait, R.; Burghardt, J.; Chung, A. P.; Da Costa, M. S. (1997). "Deinococcus geothermalis sp. nov. and Deinococcus murrayi sp. nov., Two Extremely Radiation-Resistant and Slightly Thermophilic Species from Hot Springs". International Journal of Systematic Bacteriology. 47 (4): 939–947. doi:10.1099/00207713-47-4-939. ISSN 0020-7713. PMID 9336890.
  2. Gronstal, Aaron L. (31 July 2014). "Exploring Mars in low Earth orbit". NASA's Astrobiology Magazine. Retrieved 2014-08-02.
  3. Kramer, Miriam (18 August 2014). "Russian Cosmonaut Tosses Satellite for Peru During Spacewalk". Space.com. Retrieved 2014-08-19.
  4. BOSS on EXPOSE R2 Comparative Investigations on Biofilm and Planktonic cells of Deinococcus geothermalis as Mission Preparation Tests. EPSC Abstracts. Vol. 8, EPSC2013-930, 2013. European Planetary Science Congress 2013.
  5. Makarova, KS.; Omelchenko, MV.; Gaidamakova, EK.; Matrosova, VY.; Vasilenko, A.; Zhai, M.; Lapidus, A.; Copeland, A.; et al. (2007). "Deinococcus geothermalis: the pool of extreme radiation resistance genes shrinks". PLOS ONE. 2 (9): e955. Bibcode:2007PLoSO...2..955M. doi:10.1371/journal.pone.0000955. PMC 1978522. PMID 17895995.

Further reading


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