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Halorubrum orientale sp. nov., a halophilic archaeon isolated from Lake Ejinor, Inner Mongolia, China

¹ Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
² Noda Institute for Scientific Research, 399 Noda, Noda-shi, Chiba-ken 278-0037, Japan
³ State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, China
⁴ Department of Biotechnology, University of the Western Cape, Bellville 7535, Cape Town, South Africa
⁵ Genencor International BV, Archimedesweg 30, 2333 CN Leiden, The Netherlands
⁶ Department of Infection, Immunity and Inflammation, University of Leicester, Leicester LE1 9HN, UK

Correspondence
A. Ventosa
ventosa{at}us.es

A motile, pleomorphic, red-pigmented archaeon, strain EJ-52^T, was isolated from water from Lake Ejinor, a saline lake in Inner Mongolia, China. Analysis of the almost-complete 16S rRNA gene sequence showed that the isolate was phylogenetically related to species of the genus Halorubrum, being most closely related to Halorubrum saccharovorum ATCC 29252^T (96.1 % sequence similarity), Halorubrum lacusprofundi JCM 8891^T (95.9 %), Halorubrum tibetense AS 1.3239^T (95.2 %), Halorubrum alcaliphilum AS 1.3528^T (95.2 %) and Halorubrum vacuolatum JCM 9060^T (95.1 %). The polar lipids of strain EJ-52^T were C₂₀C₂₀ derivatives of phosphatidylglycerol phosphate and phosphatidylglycerol phosphate methyl ester and a sulfated diglycosyl diether. Strain EJ-52^T requires at least 2.5 M NaCl for growth and grows optimally at 3.4 M NaCl. The strain grows at 25–50 °C, with optimal growth occurring at 35–45 °C. Mg²⁺ is not required. The DNA G+C content is 64.2 mol%. On the basis of the data obtained in this study, strain EJ52^T represents a novel species, for which the name Halorubrum orientale sp. nov. is proposed. The type strain is EJ-52^T (=CECT 7145^T=JCM 13889^T=CGMCC 1.6295^T).

A phase-contrast micrograph and TLC of polar lipids of strain EJ-52^T are available as supplementary figures in IJSEM Online.

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