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Halalkalicoccus tibetensis gen. nov., sp. nov., representing a novel genus of haloalkaliphilic archaea

¹ State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080, China
² Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Seville, Spain
³ Department of Infection, Immunity and Inflammation, University of Leicester, Leicester LE1 9HN, UK
⁴ Genencor International BV, Archimedesweg 30, 2333 CN Leiden, The Netherlands
⁵ Department of Biotechnology, University of the Western Cape, Bellville, 7535, South Africa

Correspondence
Yanhe Ma
mayanhe{at}sun.im.ac.cn

A haloalkaliphilic archaeon (strain DS12^T) isolated from Lake Zabuye, the Tibetan Plateau, China, was characterized to elucidate its taxonomy. The strain was aerobic, chemo-organotrophic, and grew optimally at 40 °C, pH 9·5–10·0 and 3·4 M NaCl. Cells of strain DS12^T were non-motile cocci and stained Gram-variable. The major polar lipids of strain DS12^T were diphytanyl and phytanyl-sesterterpanyl diether derivatives of phosphatidylglycerol and phosphatidylglycerol phosphate methyl ester. No glycolipids were detected. Phylogenetic analysis revealed that the strain formed a distinct lineage within the family Halobacteriaceae. The low 16S rRNA gene sequence similarity values to its closest relatives (91·5–92·5 %) and its signature bases both suggest that the strain has no close affinity with any members of the family Halobacteriaceae with validly published names. Therefore, it is proposed that strain DS12^T (=AS 1.3240^T=JCM 11890^T) represents the type strain of a novel species in a new genus, Halalkalicoccus tibetensis gen. nov., sp. nov.

Published online ahead of print on 29 July 2005 as DOI 10.1099/ijs.0.63916-0.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain DS12^T is AF435112.

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