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Thermococcus hydrothermalis sp. nov., a New Hyperthermophilic Archaeon Isolated from a Deep-Sea Hydrothermal Vent

Anne Godfroy^1,*, Françoise Lesongeur¹, Gérard Raguénès¹, Joël Quérellou¹, Elisabeth Antoine¹, Jean-Roch Meunier^1,2,, Jean Guezennec¹ and Georges Barbier¹

¹Laboratoire de Biotechnologie, Département Environnement Profond, IFREMER, Centre de Brest, 29280 Plouzané, France
²Unité des Entérobactéries, Institut Pasteur, 75724 Paris cedex 15, France

^* Corresponding author. Mailing address: Laboratoire de Caractérisation des Microorganismes Marins, DRV/VP, IFREMER, Centre de Brest, BP70, 29280 Plouzané, France.

ABSTRACT

An extremely thermophilic archaeon, strain AL662^T, was isolated from a deep-sea hydrothermal vent located on the East Pacific Rise at a latitude of 21°N. This strain is a strictly anaerobic coccus, and its cells range from 0.8 to 2 µ in diameter. The optimum temperature, pH, and Sea Salt concentration for growth are 85°C, 6, and 20 to 40 g/liter, respectively. Strain AL662^Tgrows preferentially on proteolysis products, on a mixture of 20 amino acids, and on maltose in the presence of elemental sulfur. The membrane lipids consist of di- and tetraether glycerol lipids. The DNA G+C content is 58 mol%. Sequencing of the 16S rRNA gene showed that strain AL662^Tbelongs to the genus Thermococcus. On the basis of hybridization results, we propose that this strain should be placed in a new species, Thermococcus hydrothermalis.

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