Abstract
A gram-positive, motile, strict anaerobic spore-forming bacterium was isolated from the overcooled brine in the permafrost. The optimal temperature for isolate growth was 5–6°C at pH 6.8–7.2. The bacterium was growing on the medium rich in saccharides and disaccharides. Out of polysaccharides tested, only xylan sustained the growth. Fermentation of the hexoses led to the formation of acetate, butyrate, lactate, H2,CO2 and some formate and ethanol. Cell wall peptidoglycan contained meso-diaminopimelic acid. The major fatty acids of the cell wall were C14:0 and C16:1c9. The content of G-C pairs in DNA was 31.4 mol%. As phylogenetic analysis has shown, it is closely linked to the members of cluster 1 of Clostridium. It differs from the other species of the genus by the substrates necessary for the growth, products forming as a result of the fermentation and content of the fatty acids in the cell wall. Thus, it was suggested to describe this strain as a new species named Clostridium algoriphilum. Type strain 14D1 was deposited into the Russian Collection of the Microorganisms VKM B-2271T and German Collection of the Microorganisms DSM 16153T .
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Acknowledgments
This study was supported by the Russian Foundation for Basic Research (Projects 03-04-48719 and 04-04-48257) and by the NASA Astrobiology Institute. We would like to thank Dr Stefan Spring at the German Collection of the Microorganisms for providing the strains for comparative studies. We are grateful to Dr Jean Euzéby for suggesting the species name.
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Communicated by K. Horikoshi
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Shcherbakova, V.A., Chuvilskaya, N.A., Rivkina, E.M. et al. Novel psychrophilic anaerobic spore-forming bacterium from the overcooled water brine in permafrost: description Clostridium algoriphilum sp. nov.. Extremophiles 9, 239–246 (2005). https://doi.org/10.1007/s00792-005-0438-3
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DOI: https://doi.org/10.1007/s00792-005-0438-3