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Saccharospirillum impatiens gen. nov., sp. nov., a novel -Proteobacterium isolated from hypersaline Ekho Lake (East Antarctica)

Matthias Labrenz^1,, Paul A. Lawson², Brian J. Tindall³, Matthew D. Collins² and Peter Hirsch¹

¹ Institut für Allgemeine Mikrobiologie, Christian-Albrechts-Universität, Kiel, Germany
² School of Food Biosciences, University of Reading, UK
³ DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Braunschweig, Germany

Correspondence
Matthias Labrenz
mla{at}gbf.de

Five Gram-negative, motile, aerobic to microaerophilic spirilla were isolated from various depths of the hypersaline, heliothermal and meromictic Ekho Lake (East Antarctica). The strains are oxidase- and catalase-positive, metabolize a variety of sugars and carboxylic acids and have an absolute requirement for sodium ions. The predominant fatty acids of the organisms are C_{16 : 1}7c, C_{16 : 0} and C_{18 : 1}7c, with C_{10 : 1} 3-OH, C_{10 : 0} 3-OH, C_{12 : 0} 3-OH, C_{14 : 1} 3-OH, C_{14 : 0} 3-OH and C_{19 : 1} present in smaller amounts. The main polar lipids are diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylglycerol and phosphatidylmonomethylamine. The DNA base composition of the strains is 54–55 mol% G+C. 16S rRNA gene sequence comparisons show that the isolates are related to the genera Oceanospirillum, Pseudospirillum, Marinospirillum, Halomonas and Chromohalobacter in the -Proteobacteria. Morphological, physiological and genotypic differences from these previously described genera support the description of a novel genus and species, Saccharospirillum impatiens gen. nov., sp. nov. The type strain is EL-105^T (=DSM 12546^T=CECT 5721^T).

The EMBL accession number for the 16S rRNA sequence of strain EL-105^T is AJ315983.

Tables of differences between strains of Saccharospirillum impatiens, and 16S rDNA sequence differences with related genera, are available as supplementary data in IJSEM Online.

Present address: GBF – German Research Centre for Biotechnology, Mascheroder Weg 1, D-38124 Braunschweig, Germany.

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