Species diversity of magnetotactic bacteria from the Ol’khovka River, Russia

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• 作者：M. V. Dziuba (1)
  T. V. Kolganova (1)
  V. M. Gorlenko (2)
  B. B. Kuznetsov (1)
  
• 关键词：magnetotactic bacteria ; magnetosomes ; magnetotaxis ; 16S rRNA ; phylogenetic analysis
• 刊名：Microbiology
• 出版年：2013
• 出版时间：May 2013
• 年：2013
• 卷：82
• 期：3
• 页码：335-340
• 全文大小：755KB
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• 作者单位：M. V. Dziuba (1)
  T. V. Kolganova (1)
  V. M. Gorlenko (2)
  B. B. Kuznetsov (1)
  
  1. Bioengineering Center, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, k. 1, Moscow, 117312, Russia
  2. Winogradsky Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, k. 2, Moscow, 117312, Russia
  
• ISSN：1608-3237

文摘

A fraction of magnetotactic bacteria was isolated by magnetic separation from the water and silt samples collected from the Ol’khovka River (Kislovodsk, Russia). A 16S rRNA clone library was obtained from the total DNA of the fraction by PCR amplification and molecular cloning. Phylogenetic analysis of 67 16S rRNA gene sequences of randomly selected clones demonstrated that two phylotypes of magnetotactic bacteria were present in the library: the first phylotype consisted of 42 sequences and the second one included only one sequence. The remaining 24 sequences belonged to non-magnetotactic bacteria. According to the results of phylogenetic analysis, both phylotypes were magnetotactic cocci; the predominant sequences were almost identical to the 16S rRNA sequence of the freshwater coccus TB24 (X81185.1) identified earlier among the magnetotactic bacteria isolated from Lake Chiemsee (Bavaria). The phylotype represented by a single sequence formed a separate branch in the dendrogram, with 97% similarity between its sequence and that of TB24. The discovered phylotypes formed with the sequences of uncultured freshwater magnetotactic cocci a separate branch within the class Alphaproteobacteria and presumably belonged to a separate family within the recently described order Magnetococcales. Despite the fact that phylogenetic analysis of the 16S rRNA clone library did not reveal any phylotypes of magnetotactic spirilla, after the secondary enrichment of the fraction of magnetotactic bacteria using the “race track-technique, a new strain of magnetotactic spirilla, Magnetospirillum SO-1, was isolated. The closest relative of strain SO-1 was the previously described magnetotactic spirillum Magnetospirillum magneticum AMB-1.