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Salinivibrio proteolyticus sp. nov., a moderately halophilic and proteolytic species from a hypersaline lake in Iran

¹ Extremophiles Lab., Dept of Microbiology, Faculty of Biology, College of Science, University of Tehran, Tehran, Iran
² DSMZ – German Collection of Micro-organisms and Cell Cultures, Braunschweig, Germany
³ IBB Center, Tehran University, Tehran, Iran

Correspondence
Mohammad Ali Amoozegar
amozegar{at}khayam.ut.ac.ir

A novel moderately halophilic, Gram-negative, curved-rod-shaped bacterium, designated strain AF-2004^T, was isolated from Bakhtegan Lake, a hypersaline lake with 17 % (w/v) total salt located in the southern region of Iran. Strain AF-2004^T was a facultative anaerobe, motile by one polar flagellum, non-sporulating and oxidase- and catalase-positive. It grew at salinities of 1–17 % (w/v) NaCl, showing optimal growth at 5 % (w/v). Growth occurred at 10.0–45.0 °C and pH 5.0–9.5, with optimum growth at 32.0–35.0 °C and pH 8.0–8.5. Phylogenetic analyses based on 16S rRNA gene sequence comparisons indicated that strain AF-2004^T is a member of the genus Salinivibrio. Strain AF-2004^T had C_{18 : 1}7c (31.6 %), C_{16 : 1}7c (22.1 %) and C_{16 : 0} (20.7 %) as the predominant fatty acids and Q-8 as the major respiratory lipoquinone. The DNA G+C content was 49.5 mol%, which is in the range of values for members of the genus Salinivibrio. On the basis of differentiation from Salinivibrio costicola by phenotypic and chemotaxonomic characteristics, 16S rRNA sequence analysis and DNA–DNA relatedness, it is proposed that strain AF-2004^T (=DSM 19052^T =CIP 109598^T) should be placed in the genus Salinivibrio as the type strain of a novel species, Salinivibrio proteolyticus sp. nov.

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