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1Institut für Allgemeine Mikrobiologie, Universität Kiel, D-24118 Kiel, Germany
2Department of Microbiology, BBSRC Institute of Food Research, Reading Laboratory, Reading RG6 6BZ, UK
3DSMZ - Deutsche Sammlung von Mikroorganismen und Zellkulturen, D-38124 Braunschweig, Germany
4Tel: +49 431 880 4340. Fax: +49 431 880 2194. e-mail: phirsch{at}ifam.uni-kiel.de
ABSTRACT
Four Gram-negative, aerobic, pointed and budding bacteria were isolated from various depths of the hypersaline, heliothermal and meromictic Ekho Lake (Vestfold Hills, East Antarctica). The cells contained storage granules and formed rosettes. Daughter cells may be motile. Growth required sodium ions. Nitrate was reduced to nitrite, and dissimilatory reduction of nitrite was possible. DNase and gelatinase were produced. Glutamate was metabolized with and without an additional source of combined nitrogen. The most abundant fatty acid was C18:1; other fatty acids present in lower concentrations were C12:1 3-OH, C16:1, C16:0, C18:0 and C19:0 cyc. The main polar lipids were phosphatidylglycerol and phosphatidylcholine. The DNA base composition was 62·3–62·8 mol% G+C. 16S rDNA sequence comparisons showed the isolates to be phylogenetically related to the genera Sagittula and Roseobacter. Morphological, physiological and genotypic differences to these and distinct characteristics supported the description of a new genus and a new species, Antarctobacter heliothermus gen. nov., sp. nov. The type strain is EL-219T(= DSM 11445T).
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