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Phylogenetic analysis of several Thermus strains from Rehai of Tengchong, Yunnan, China

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Several Thermus strains were isolated from 10 hot springs of the Rehai geothermal area in Tengchong, Yunnan province. The diversity of Thermus strains was examined by sequencing the 16S rRNA genes and comparing their sequences. Phylogenetic analysis showed that the 16S rDNA sequences from the Rehai geothermal isolates form four branches in the phylogenetic tree and had greater than 95.9% similarity in the phylogroup. Secondary structure comparison also indicated that the 16S rRNA from the Rehai geothermal isolates have unique secondary structure characteristics in helix 6, helix 9, and helix 10 (reference to Escherichia coli). This research is the first attempt to reveal the diversity of Thermus strains that are distributed in the Rehai geothermal area.Key words: Thermus, diversity, phylogenetic analysis, RNA secondary structure.

Plusieurs souches de Thermus ont été isolées de sources d'eau chaude dans la région géothermique de Rehai, comté de Tengchong, province de Yunnan. La diversité des souches de Thermus a été examinée par séquençage des gènes codant les ARNr 16S et comparaison de leurs séquences. L'analyse phylogénique a démontré que les séquences des ADNr 16S des isolats géothermiques de Rehai forment quatre branches dans l'arbre phylogénique (plus de 95,9 % de similarité est retrouvée au sein d'un groupe phylogénique). La comparaison des structures secondaires a aussi indiqué que les ARNr 16S des isolats géothermiques de Rehai ont des caractéristiques uniques au sein de la structure secondaire des hélices 6, 9 et 10, si on les compare à Escherichia coli. Cette recherche constitue la première tentative visant à révéler la diversité des souches de Thermus distribuées dans les régions géothermiques de Rehai.Mots clés : Thermus, diversité, analyse phylogénique, structure secondaire des ARN.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2005-09-01

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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