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Int J Syst Evol Microbiol 58 (2008), 2511-2519; DOI  10.1099/ijs.0.65424-0
© 2008 International Union of Microbiological Societies

Hellea balneolensis gen. nov., sp. nov., a prosthecate alphaproteobacterium from the Mediterranean Sea

Karine Alain1,{dagger}, Brian J. Tindall2, Laurent Intertaglia1, Philippe Catala1 and Philippe Lebaron1

1 Université Pierre et Marie Curie-Paris 6, CNRS UMR7621, F-66650 Banyuls-sur-Mer, France
2 DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Inhoffenstr. 7b, D-38124 Braunschweig, Germany

Correspondence
Philippe Lebaron
philippe.lebaron{at}obs-banyuls.fr

A novel aerobic, heterotrophic, prosthecate bacterium, designated 26III/A02/215T, was isolated from surface water of the north-western Mediterranean Sea. Cells stained Gram-negative and were straight to slightly curved rods, forming red colonies on agar plates. The strain grew at 15–37 °C inclusive (optimum 30 °C) and grew optimally at seawater salinity. Growth was observed on organic acids, amino acids and complex organic substrates. The fatty acids (>5 %) detected in strain 26III/A02/215T were C17 : 1{omega}6c, C18 : 1{omega}7c and C17 : 0. The lipid pattern indicated the presence of phosphatidylglycerol, glucuronopyranosyldiglyceride, monoglycosyldiglyceride, an unidentified glycolipid and three unidentified phospholipids. Phosphatidylethanolamine and diphosphatidylglycerol were absent. Ubiquinone Q-10 was the only respiratory lipoquinone. The G+C content of the genomic DNA was 46.8 mol%. Comparative 16S rRNA gene sequence analysis indicated that strain 26III/A02/215T belonged to the Hyphomonas–Hirschia–Robiginitomaculum branch of the order Caulobacterales. This affiliation was consistent with the results of polar lipid analyses. Among this group, the novel isolate was most closely related to Robiginitomaculum antarcticum (93.9 % 16S rRNA gene sequence similarity to the type strain). On the basis of genotypic, chemotaxonomic and phenotypic distinctness, we propose a novel genus, Hellea gen. nov., with Hellea balneolensis sp. nov. as the type species. The type strain of Hellea balneolensis is 26III/A02/215T (=DSM 19091T =CIP 109500T =OOB 269T).

Abbreviations: TBSA, tuberculostearic acid

{dagger}Present address: UMR6197, Laboratoire de Microbiologie des Environnements Extrêmes, IUEM, Technopôle Brest-Iroise, F-29280 Plouzané, France.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain 26III/A02/215T is AY576758.

A graph showing the effect of temperature on the maximum growth rate of strain 26III/A02/215T is available as supplementary material with the online version of this paper.






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Copyright © 2008 by the International Union of Microbiological Societies.