Thermococcus alcaliphilus sp. nov., a new hyperthermophilic archaeum growing on polysulfide at alkaline pH |
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Authors: | M Keller Franz-Josef Braun Reinhard Dirmeier Doris Hafenbradl Siegfried Burggraf Reinhard Rachel Karl O Stetter |
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Institution: | 1. Lehrstuhl für Mikrobiologie, Universit?tsstrasse 31, D-93053, Regensburg, Germany
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Abstract: | A novel coccoid-shaped, hyperthermophilic, heterotrophic member of the archaea was isolated from a shallow marine hydrothermal
system at Vulcano Island, Italy. The isolate grew between 56 and 90° C with an optimum around 85° C. The pH range for growth
was 6.5 to 10.5, with an optimum around 9.0. Polysulfide and elemental sulfur were reduced to H2S. Sulfur stimulated the growth rate. The isolate fermented yeast extract, peptone, meat extract, tryptone, and casein. Isovalerate,
isobutyrate, propionate, acetate, CO2, NH3, and H2S (in the presence of S°) were detected as end products. Growth was not inhibited by H2. Based on DNA-DNA hybridization and 16S rRNA partial sequences, the new isolate represents a new species of Thermococcus, which we named Thermococcus alcaliphilus. The type strain is isolate AEDII12 (DSM 10322)
Received: 7 July 1995 / Accepted: 25 August 1995 |
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Keywords: | Archaea Hyperthermophiles Thermococcus alcaliphilus Polysulfide reduction Alkaline pH |
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