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Exiguobacterium

Exiguobacterium is a genus of bacilli and a member of the low GC phyla of Firmicutes. Collins et al. first described the genus Exiguobacterium with the characterization of E. aurantiacum strain DSM6208T from an alkaline potato processing plant.[1] It has been found in areas covering a wide range of temperatures (-12oC—55oC) including glaciers in Greenland and hot springs in Yellowstone, and has been isolated from ancient permafrost in Siberia.[2] This ability to survive in varying temperature extremes makes them an important area of study. Some strains in addition to dynamic thermal adaption are also halotolerant (up to 13% added NaCl added to the medium), can grow within a wide range of pH values (5-11), tolerate high levels of UV radiation, and heavy metal stress (including arsenic).[3]

Exiguobacterium are globally diverse organisms that are found in a variety of environments including microbialites (Thrombolite[4] from Pavilion Lake, BC and Stromatolites[5] from Laguna Socompa, Argentina), ocean,[6] freshwater lakes,[7] Himalayan ice,[8] Himalayan soil,[9] hydrothermal vents,[10] brine shrimp [11] and in microbial biofilms [12]

Currently, seven genomes from the genus have been completed as either complete (one circular chromosome, with plasmids) or in a draft format (containing multiple unassembled contigs).

References[edit]

  1. ^ Collins MD, Lund BM, Farrow JAE, Schleifer KH. (1983). "Chemotaxonomic study of an alkaliphilic bacterium, Exiguobacterium aurantiacum gen nov., sp. nov..". J. Gen. Microbiol 129: 2037–2042. doi:10.1099/00221287-129-7-2037. 
  2. ^ Vishnivetskaya, Tatiana A.;Kathariou, Sophia and Tiedje, James M. (May 2009). "The Exiguobacterium genus: biodiversity and biogeography". Extremophiles 13 (3): 541–555. doi:10.1007/s00792-009-0243-5. 
  3. ^ Ordoñeza OF, Lanzarottid E, Kurtha D, Gorritia MF, Revalec S, Cortez N, Vazquez MP, Farías ME, Turjanskie AG. (July–August 2013). "Draft Genome Sequence of the Polyextremophilic Exiguobacterium sp. Strain S17, Isolated from Hyperarsenic Lakes in the Argentinian Puna". Genome Announcements 1 (4): 2037–2042. doi:10.1128/genomeA.00480-13. 
  4. ^ White III RA, Grassa CJ, Suttle CA. (July–August 2013). "Draft Genome Sequence of an Exiguobacterium pavilionensis Strain RW-2 with Wide Thermal, Salinity, and pH Tolerance, Isolated from Modern Freshwater Microbialites". Genome Announcements 1 (4): e00597–13. doi:10.1128/genomeA.00597-13. 
  5. ^ Ordoñeza OF, Lanzarottid E, Kurtha D, Gorritia MF, Revalec S, Cortez N, Vazquez MP, Farías ME, Turjanskie AG. (July–August 2013). "Draft Genome Sequence of the Polyextremophilic Exiguobacterium sp. Strain S17, Isolated from Hyperarsenic Lakes in the Argentinian Puna". Genome Announcements 1 (4): 2037–2042. doi:10.1128/genomeA.00480-13. 
  6. ^ Kim IJ, Lee MH, Jung SY, Song JJ, Oh TK, Yoon JH. (2005). "Exiguobacterium aestuarii sp. nov. and E. marinum sp. nov., isolated from tidal flat of the yellow sea in Korea.". Int. J. Syst. Evol. Microbiol. 55: 885–889. 
  7. ^ Raichand R, Pareek S, Singh NK, Mayilraj S. (2012). "Exiguobacterium aquaticum sp. nov., a new member of the genus Exiguobacterium.". Int. J. Syst. Evol. Microbiol. 62: 2150–2155. doi:10.1099/ijs.0.035790-0. 
  8. ^ Chaturvedi P, Shivaji S. (2006). "Exiguobacterium indicum sp. nov., a psychrophilic bacterium from the Hamta glacier of the Himalayan mountain ranges of India". Int. J. Syst. Evol. Microbiol. 56 (103): 2765–2770. 
  9. ^ Singh NK, Raichand R, Kaur I, Kaur C, Pareek S, Mayilraj S. (2013). "Exiguobacterium himgiriensis sp. nov., a novel member of the genus Exiguobacterium, isolated from the Indian Himalayas.". Antonie Van Leeuwenhoek 103: 789–796. doi:10.1007/s10482-012-9861-5. 
  10. ^ Crapart S, Fardeau ML, Cayol JL, Thomas P, Sery C, Ollivier B, Combet-Blanc Y. (2007). "Exiguobacterium profundum sp., nov., a moderately thermophilic, lactic acid-producing bacterium isolated from a deep-sea hydrothermal vent". Int. J. Syst. Bacteriol. 57: 287–292. doi:10.1099/ijs.0.64639-0. 
  11. ^ Lopez-Cortes A, Schumann P, Pukall R, Stackebrandt E. (2006). "Exiguobacterium mexicanum sp. nov. and Exiguobacterium artemiae sp., nov., isolated from the brine shrimp Artemia franciscana.". Syst. Appl. Microbiol. 29: 183–190. doi:10.1016/j.syapm.2005.09.007. 
  12. ^ Carneiro AR, Ramos RT, Dall’Agnol H, Pinto AC, de Castro Soares S,Santos AR, Guimarães LC, Almeida SS, Baraúna RA, das Graças DA, Franco LC, Ali A, Hassan SS, Nunes CI, Barbosa MS, Fiaux KK,Aburjaile FF, Barbosa EG, Bakhtiar SM, Vilela D, Nóbrega F, dos Santos AL, Carepo MS, Azevedo V, Schneider MP, Pellizari VH, Silva A. (2012). "Genome sequence of Exiguobacterium antarcticum B7, isolated from a biofilm in Ginger Lake, King George Island, Antarctica.". J. Bacteriol. 23: 6689–6690. 


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