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

Author:

Castillo A. M.1,Gutiérrez M. C.1,Kamekura M.2,Xue Y.3,Ma Y.3,Cowan D. A.4,Jones B. E.5,Grant W. D.6,Ventosa A.1

Affiliation:

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

Abstract

A motile, pleomorphic, red-pigmented archaeon, strain EJ-52T, 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 29252T (96.1 % sequence similarity), Halorubrum lacusprofundi JCM 8891T (95.9 %), Halorubrum tibetense AS 1.3239T (95.2 %), Halorubrum alcaliphilum AS 1.3528T (95.2 %) and Halorubrum vacuolatum JCM 9060T (95.1 %). The polar lipids of strain EJ-52T were C20C20 derivatives of phosphatidylglycerol phosphate and phosphatidylglycerol phosphate methyl ester and a sulfated diglycosyl diether. Strain EJ-52T 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 EJ52T represents a novel species, for which the name Halorubrum orientale sp. nov. is proposed. The type strain is EJ-52T (=CECT 7145T=JCM 13889T=CGMCC 1.6295T).

Publisher

Microbiology Society

Subject

General Medicine,Ecology, Evolution, Behavior and Systematics,Microbiology

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