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Int J Syst Evol Microbiol 58 (2008), 773-778; DOI  10.1099/ijs.0.65294-0
© 2008 International Union of Microbiological Societies

Elioraea tepidiphila gen. nov., sp. nov., a slightly thermophilic member of the Alphaproteobacteria

Luciana Albuquerque1, Fred A. Rainey2, M. Fernanda Nobre1 and Milton S. da Costa3

1 Department of Zoology and Center for Neurosciences and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
2 Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA
3 Department of Biochemistry, University of Coimbra, 3001-401 Coimbra, Portugal

Correspondence
Milton S. da Costa
milton{at}ci.uc.pt

A bacterial isolate, strain TU-7T, with an optimum growth temperature of about 45–50 °C and an optimum pH for growth between 8.0 and 8.5, was recovered from a hot spring in the Furnas area of the island of São Miguel in the Azores. The new isolate is non-pigmented, facultatively chemolithoorganotrophic, strictly aerobic and catalase- and oxidase-positive. The organism oxidized thiosulfate to sulfate with enhancement of growth. This organism assimilated organic acids but did not assimilate carbohydrates or polyols. 16S rRNA gene sequence analysis placed strain TU-7T within the radiation of the Alphaproteobacteria as a deep branch of the family Acetobacteriaceae. The major fatty acids of strain TU-7T are 18 : 1{omega}7c, 18 : 0, 19 : 0 cyclo {omega}8c and an aliphatic chain with an equivalent chain-length of 20.195, identified as 19 : 0 2-OH cyclo {omega}8 ({Delta}11 : 12). Ubiquinone 10 is the major respiratory quinone and the major polar lipids are phosphatidylcholine, phosphatidylethanolamine, diphosphosphatidylglycerol and phosphatidylglycerol in addition to two unidentified aminolipids. Bacteriochlorophyll a and puf genes were not detected. Based on 16S rRNA gene sequence analysis and physiological and biochemical characteristics, we describe a novel species of a new genus represented by strain TU-7T, for which we propose the name Elioraea tepidiphila gen. nov., sp. nov. The type strain of Elioraea tepidiphila is strain TU-7T (=DSM 17972T =CIP 109115T).

Abbreviations: BChl, bacteriochlorophyll

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain TU-7T is EF519867.

Results of one-dimensional TLC of polar lipids and analysis of the fatty acid composition of strain TU-7T are available as supplementary material with the online version of this paper.






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