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Int J Syst Bacteriol 46 (1996), 1113-1119; DOI 10.1099/00207713-46-4-1113
© 1996 Society for General Microbiology
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Thermococcus fumicolans sp. nov., a New Hyperthermophilic Archaeon Isolated from a Deep-Sea Hydrothermal Vent in the North Fiji Basin

ANNE GODFROY1,*, JEAN-ROCH MEUNIER1,2, JEAN GUEZENNEC1, FRANÇOISE LESONGEUR1, GÉRARD RAGUÉNÈS1, ALAIN RIMBAULT3 and GEORGES BARBIER1

1Laboratoire de Biotechnologie, Département Environnement Profond IFREMER, Centre de Brest, 29280 Plouzané, France
2Unité des Enterobactéries, Institut Pasteur, 75724 Paris cedex 15, France
3Laboratoire de Microbiologie, Unité Microbiologie Anaérobie, Faculté des Sciences Pharmaceutiques et Biologiques de Paris, Université René Descartes, 75270 Paris cedex 06, France

* Corresponding author. Mailing address: Laboratoire de Biotechnologie. Département Environnement Profond IFREMER Centre de Brest. BP70, 29280 Plouzané, France.

ABSTRACT

An extremely thermophilic archaeon, strain ST557T (T = type strain), was isolated from a deep-sea hydrothermal vent in the North Fiji Basin. This strain is a strictly anaerobic coccus whose cells are about 0.8 to 2 µm in diameter. The optimum temperature, pH and sea salt concentration for growth are 85°C, 8.5, and 20 to 40 g/liter, respectively. Strain ST557T grows preferentially in the presence of elemental sulfur on proteinaceous substrates and on a mixture of 20 amino acids. It grows slowly on pyruvate and maltose. Growth is inhibited by rifampin. The DNA G+C content is 54 to 55 mol%. Sequencing of the 16S rRNA gene revealed that strain ST557T belongs to the genus Thermococcus. We propose that this organism should be placed in a new species, Thermococcus fumicolans.




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