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1 Laboratoire ORSTOM de Microbiologie des Anaérobies, Université de Provence, CESB-ESIL case 925, 163 Avenue de Luminy, 13288 Marseille Cedex 9, France
2 Sanofi Recherche, Groupe Elf-Aquitaine, 31676 Labège Cedex, France
3 School of Biomolecular and Biomedical Sciences, Faculty of Science, Griffith University, Brisbane, Queensland 4111, Australia
4 Département de Biologie, Université de la Méditerranée, 13288 Marseille cedex 9, France
Author for correspondence: Bernard Ollivier. Tel: +33 4 91 82 85 76. Fax: +33 4 91 82 85 70. e-mail: ollivier{at}esil.univ-mrs.fr
ABSTRACT
A strictly anaerobic, halotolerant, spindle-shaped rod, designated strain SEBR 4211T, was isolated from an African saline oil-producing well. Cells stain Grampositive, which was confirmed by electron microscopy observations. Strain SEBR 4211T was motile by means of one to four peritrichous flagella, had a G+C content of 43 mol% and grew optimally at 37 °C, pH 7·3, with 0 to 3% (w/v) NaCI. It utilized a limited number of carbohydrates (cellobiose, glucose, fructose, mannitol and ribose) and produced acetate, butyrate, CO2 and H2 as end products from glucose fermentation. It reduced thiosulfate to sulfide. In the presence of thiosulfate, a decrease in butyrate and an increase in acetate production was observed. Phylogenetically, strain SEBR 4211T was related to members of the low G+C Clostridiales order with Clostridium halophilum as the closest relative (16S rDNA sequence similarity of 90%). On the basis of phenotypic, genotypic and phylogenetic characteristics of the isolate, it is proposed to designate it as a new species of a new genus, Fusibacter gen. nov., as Fusibacter paucivorans sp. nov. The type strain is SEBR 4211T (= DSM 12116T
Key Words: Fusibacter paucivorans • oil-producing well • thiosulfate reduction • taxonomy
The GenBank accession number for the 16S rRNA sequence of strain SEBR 4211T IS AF050099.
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