Extremophiles

, Volume 8, Issue 4, pp 325–334 | Cite as

Thialkalivibrio halophilus sp. nov., a novel obligately chemolithoautotrophic, facultatively alkaliphilic, and extremely salt-tolerant, sulfur-oxidizing bacterium from a hypersaline alkaline lake

  • Horia Banciu
  • Dimitry Y. Sorokin
  • Erwin A. Galinski
  • Gerard Muyzer
  • Robbert Kleerebezem
  • J. Gijs Kuenen
Original Paper

Abstract

A new chemolithoautotrophic, facultatively alkaliphilic, extremely salt-tolerant, sulfur-oxidizing bacterium was isolated from an alkaline hypersaline lake in the Altai Steppe (Siberia, Russia). According to 16S rDNA analysis and DNA–DNA hybridization, strain HL 17T was identified as a new species of the genus Thialkalivibrio belonging to the γ subdivision of the Proteobacteria for which the name Thialkalivibrio halophilus is proposed. Strain HL 17T is an extremely salt-tolerant bacterium growing at sodium concentrations between 0.2 and 5 M, with an optimum of 2 M Na+. It grew at high concentrations of NaCl and of Na2CO3/NaHCO3 (soda). Strain HL 17T is a facultative alkaliphile growing at pH range 7.5–9.8, with a broad optimum between pH 8.0 and 9.0. It used reduced inorganic sulfur compounds (thiosulfate, sulfide, polysulfide, elemental sulfur, and tetrathionate) as energy sources and electron donors. In continuous culture under energy limitation, thiosulfate was stoichiometrically oxidized to sulfate. In sodium carbonate medium under alkaline conditions, the maximum growth rate was similar, while the biomass yield was lower as compared with the NaCl-grown culture. The maximum sulfur-oxidizing capacity measured in washed cells was higher in the soda buffer independent of the growth conditions. The compatible solute content of the biomass was higher in the sodium chloride-grown culture than in the sodium carbonate/bicarbonate-grown culture. The data suggest that the osmotic pressure differences between soda and NaCl solutions might be responsible for the difference observed in compatible solutes production. This may have important implications in overall energetic metabolism of high salt adaptation.

Keywords

Compatible solutes Facultative alkaliphilic Halophilic Osmotic pressure Soda Sulfur oxidizing Thialkalivibrio halophilus 

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Horia Banciu
    • 1
  • Dimitry Y. Sorokin
    • 1
    • 2
  • Erwin A. Galinski
    • 3
  • Gerard Muyzer
    • 1
  • Robbert Kleerebezem
    • 1
  • J. Gijs Kuenen
    • 1
  1. 1.Department of BiotechnologyDelft University of TechnologyDelftThe Netherlands
  2. 2.Institute of MicrobiologyRussian Academy of SciencesMoscowRussia
  3. 3.Institute of Microbiology and BiotechnologyRheinische Friedrich-Wilhelms UniversityBonnGermany

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