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Tepidiphilus margaritifer gen. nov., sp. nov., isolated from a thermophilic aerobic digester

¹ Escola Superior de Biotecnologia, Universidade Católica Portuguesa, 4200-072 Porto, Portugal
² Area de Microbiologia, Universitat de les Illes Balears, 07071 Palma de Mallorca, Spain
³ LEPAE–Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, 4200-465 Porto, Portugal

Correspondence
Célia M. Manaia
celman{at}esb.ucp.pt

A moderately thermophilic bacterium is described, strain N2-214^T, that was isolated from an enrichment culture, growing on caprolactone, obtained from a sample from a water-treatment sludge aerobic digester operating at temperatures around 60 °C. The organism was aerobic, Gram-negative, oxidase- and catalase-positive, with a polar flagellum, and capable of growth at temperatures as high as 61 °C. The major fatty acids of strain N2-214^T were C_{16 : 0}, C_{18 : 1} and cyclo-C_{19 : 0}. The phylogenetic relationships of the strain, derived from 16S rRNA gene sequence comparisons, demonstrated it to be a member of the -subclass of the Proteobacteria. The highest 16S rDNA sequence similarity of isolate N2-214^T was to Azoarcus buckelii (91·9 %), Thauera aromatica (92 %) and Hydrogenophilus thermoluteolus (92·7 %). On the basis of phylogenetic analyses and physiological and chemotaxonomic characteristics, it is proposed that isolate N2-214^T (=DSM 15129^T=LMG 21637^T) represents a new genus and species, Tepidiphilus margaritifer gen. nov., sp. nov.

Published online ahead of print on 7 February 2003 as DOI 10.1099/ijs.0.02538-0.

The GenBank/EMBL/DDBJ accession number for the 16S rDNA sequence of isolate N2-214^T is AJ504663.

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