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Natrinema altunense sp. nov., an extremely halophilic archaeon isolated from a salt lake in Altun Mountain in Xinjiang, China

¹ College of Life Sciences, Zhejiang University, 38 Zheda Road, Hangzhou 310027, P. R. China
² Institute of Microbiology, Chinese Academy of Sciences, ZhongGuanCun, Haidian, Beijing 100080, P. R. China

Correspondence
Pei-Jin Zhou
zhou{at}sun.im.ac.cn
Min Wu
wumin{at}cls.zju.edu.cn

A novel extremely halophilic strain, AJ2^T, was isolated from Ayakekum salt lake located in the Altun Mountain National Nature Reserve in Xinjiang, China. This isolate was neutrophilic, motile and grew in a wide range of MgCl₂ concentrations (0·005–1·0 M). The major polar lipids of the isolate were C₂₀C₂₀ and C₂₀C₂₅ derivatives of phosphatidylglycerol, phosphatidylglycerol phosphate methyl ester and phosphatidylglycerol sulfate. A comprehensive 16S rRNA gene sequence analysis revealed that the isolate shared 96·6–97·7 % sequence identity with Natrinema species. The isolate, however, could be genetically differentiated from these species by DNA–DNA hybridization analysis and on the basis of its physiological properties. On the basis of the polyphasic evidence, strain AJ2^T (=AS 1.3731^T=JCM 12890^T) represents the type strain of a novel species, for which the name Natrinema altunense sp. nov. is proposed.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain AJ2^T is AY208972.

Thin-layer chromatograms showing the lipid content of strain AJ2^T and other Natrinema species, along with a table of some characteristics distinguishing this strain from Natrinema versiforme AS 1.2365^T, are available as supplementary material in IJSEM Online.

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