, Volume 10, Issue 4, pp 285–294 | Cite as

Characterization of Exiguobacterium isolates from the Siberian permafrost. Description of Exiguobacterium sibiricum sp. nov.

  • Debora Frigi RodriguesEmail author
  • Johan Goris
  • Tatiana Vishnivetskaya
  • David Gilichinsky
  • Michael F. Thomashow
  • James M. Tiedje
Original Paper


Three Gram-positive bacterial strains, 7-3, 255-15 and 190-11, previously isolated from Siberian permafrost, were characterized and taxonomically classified. These microorganisms are rod-shaped, facultative aerobic, motile with peritrichous flagella and their growth ranges are from −2.5 to 40°C. The chemotaxonomic markers indicated that the three strains belong to the genus Exiguobacterium. Their peptidoglycan type was A3α L-Lys-Gly. The predominant menaquinone detected in all three strains was MK7. The polar lipids present were phosphatidyl-glycerol, diphosphatidyl-glycerol and phosphatidyl-ethanolamine. The major fatty acids were iso-C13:0, anteiso-C13:0, iso-C15:0, C16:0 and iso-C17:0. Phylogenetic analysis based on 16S rRNA and six diverse genes, gyrB (gyrase subunit B), rpoB (DNA-directed RNA polymerase beta subunit), recA (homologous recombination), csp (cold shock protein), hsp70 (ClassI-heat shock protein—chaperonin) and citC (isocitrate dehydrogenase), indicated that the strains were closely related to Exiguobacterium undae (DSM 14481T) and Exiguobacterium antarcticum (DSM 14480T). On the basis of the phenotypic characteristics, phylogenetic data and DNA–DNA reassociation data, strain 190-11 was classified as E. undae, while the other two isolates, 7-3 and 255-15, comprise a novel species, for which the name Exiguobacterium sibiricum sp. nov. is proposed.


Exiguobacterium Exiguobacterium sibiricum sp. nov. Polyphasic taxonomy Siberian permafrost 



This work was supported by a cooperative agreement with NASA Astrobiology Institute number NCC2-1274.


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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Debora Frigi Rodrigues
    • 1
    Email author
  • Johan Goris
    • 1
  • Tatiana Vishnivetskaya
    • 2
    • 4
  • David Gilichinsky
    • 2
  • Michael F. Thomashow
    • 3
  • James M. Tiedje
    • 1
  1. 1.NASA Astrobiology Institute, Center for Microbial EcologyMichigan State UniversityEast LansingUSA
  2. 2.Institute for Physicochemical and Biological Problems in Soil ScienceRussian Academy of SciencesPushchinoRussia
  3. 3.DOE Plant Research Laboratory, NASA Astrobiology InstituteMichigan State UniversityEast LansingUSA
  4. 4.Food Science DepartmentNorth Carolina State UniversityRaleighUSA

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