Natronospira proteinivora gen. nov., sp. nov, an extremely salttolerant, alkaliphilic gammaproteobacterium from hypersaline soda lakes

Dimitry Y. Sorokin, Ilya V. Kublanov, Tatiana V. Khijniak

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)
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Abstract

Brine samples from Kulunda Steppe soda lakes (Altai, Russia) were inoculated into a hypersaline alkaline mineral medium with β-keratin (chicken feather) as a substrate. The micro-organisms dominating the enrichment culture were isolated by limiting serial dilution on the same medium with casein as a substrate. The cells of strain BSker1T were motile, curved rods. The strain was an obligately aerobic heterotroph utilizing proteins and peptides as growth substrates. The isolate was an obligate alkaliphile with a pH range for growth from pH 8.5 to 10.25 (optimum at pH 9.5), and it was extremely salt tolerant, growing with between 1 and 4.5 M total Na+ (optimally at 2–2.5 M). BSker1T had a unique composition of polar lipid fatty acids, dominated by two C17 species. The membrane polar lipids included multiple unidentified phospholipids and two aminolipids. According to phylogenetic analysis of the 16S rRNA gene sequence, the isolate forms a novel branch within the family Ectothiorhodospiraceae (class Gammaproteobacteria) with the highest sequence similarity to the members of this family being 91 %. On the basis of distinct phenotypic and genotypic properties, strain BSker1T (=JCM 31341T=UNIQEM U1008T) is proposed to be classified as a representative of a novel genus and species, Natronospira proteinivora gen. nov., sp. nov.

Original languageEnglish
Article number001983
Pages (from-to)2604-2608
Number of pages5
JournalInternational Journal of Systematic and Evolutionary Microbiology
Volume67
Issue number8
DOIs
Publication statusPublished - 2017

Keywords

  • Aerobic proteolytics
  • Gammaproteobacteria
  • Haloalkaliphilic
  • Soda lakes

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