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Fusibacter paucivorans gen. nov., sp. nov., an anaerobic, thiosulfate-reducing bacterium from an oil-producing well

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 4211^T, was isolated from an African saline oil-producing well. Cells stain Grampositive, which was confirmed by electron microscopy observations. Strain SEBR 4211^T 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 4211^T 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 4211^T (= DSM 12116^T

Key Words: Fusibacter paucivorans • oil-producing well • thiosulfate reduction • taxonomy

The GenBank accession number for the 16S rRNA sequence of strain SEBR 4211^T IS AF050099.

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