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Halorubrum ezzemoulense sp. nov., a halophilic archaeon isolated from Ezzemoul sabkha, Algeria

¹ Departamento de Microbiologia, Facultad de Farmacia, Campus Universitario de Cartuja s/n 18071, Granada, Spain
² Institut de Nutrition de l'Alimentation et des Technologies Agro-Alimentaires, Université Mentouri, Constantine, Algeria
³ Institut des Sciences de la Nature, Faculté des Sciences, Université Mentouri, Constantine, Algeria

Correspondence
Mercedes Monteoliva-Sánchez
mmonteol{at}ugr.es

A novel extremely halophilic archaeon was isolated from Ezzemoul sabkha, Algeria. The strain, designated 5.1^T, was neutrophilic, motile and Gram-negative. At least 15 % (w/v) NaCl was required for growth. The isolate grew at pH 6.5–9.0, with optimum growth at pH 7.0–7.5. Mg²⁺ was required for growth. Polar lipids were C₂₀C₂₀ derivatives of phosphatidylglycerol and phosphatidylglycerol phosphate methyl ester, and phosphatidylglycerol sulfate and sulfated diglycosyl diether. The genomic DNA G+C content of strain 5.1^T was 61.9 mol% (T_m). Phylogenetic analysis based on comparison of 16S rRNA gene sequences revealed that strain 5.1^T clustered with Halorubrum species. The results of DNA–DNA hybridization and biochemical tests allowed genotypic and phenotypic differentiation of strain 5.1^T from other Halorubrum species. The name Halorubrum ezzemoulense sp. nov. (type strain 5.1^T=CECT 7099^T=DSM 17463^T) is proposed.

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