Halorubrum kocurii sp. nov., an archaeon isolated from a saline lake

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Abstract
A Gram-negative, non-motile, neutrophilic, rod-shaped, extremely halophilic archaeon, designated strain BG-1T, was isolated from a salt lake, Lake Bagaejinnor, in Inner Mongolia, China. Strain BG-1T was able to grow at 25–55 °C, required at least 2.5 M NaCl for growth (with an optimum at 3.4 M NaCl) and grew at pH 6.0–9.0 (with an optimum at pH 7.5). Hypotonic treatment with less than 2.0 M NaCl caused cell lysis. Phylogenetic analysis of the almost-complete 16S rRNA gene sequence positioned the isolate within the genus Halorubrum in the family Halobacteriaceae. Strain BG-1T was most closely related to Halorubrum aidingense 31-hongT (98.8 % sequence similarity), Halorubrum saccharovorum NCIMB 2081T (98.6 %), Halorubrum lacusprofundi ACAM 34T (98.6 %) and Halorubrum lipolyticum 9-3T (98.4 %). However, values for DNA–DNA hybridization between strain BG-1T and the most closely related members of the genus Halorubrum were below 40 %. Analysis of the polar lipids of strain BG-1T revealed the presence of mannosyl-2-sulfate-(1-4)-glycosyl-archaeol, the main glycolipid found in neutrophilic species of the genus Halorubrum. The G+C content of the genomic DNA was 69.4 mol% (T m). Comparison of the phenotypic characteristics of the strain with those of Halorubrum species supported the conclusion that BG-1T represents a novel species within this genus, for which the name Halorubrum kocurii sp. nov. is proposed. The type strain is BG-1T (=CECT 7322T =CGMCC 1.7018T =JCM 14978T).

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