Alkalispirillum mobile gen. nov., spec. nov., an alkaliphilic non-phototrophic member of the Ectothiorhodospiraceae

M J Rijkenberg, R Kort, K J Hellingwerf

Research output: Contribution to JournalArticleAcademicpeer-review


From cultures of the anoxygenic phototroph Halorhodospira halophila SL-1, an aerobic, gram-negative spirillum was isolated. This moderately halophilic, alkaliphilic bacterium was motile by means of a single polar flagellum. It is described here as Alkalispirillum mobile gen. nov., spec. nov. Phylogenetic analysis of the Alkalispirillum mobile 16S rRNA gene led to its classification in the gamma-subclass of the Proteobacteria, as it appears closely related to phototrophic purple sulfur bacteria of the genera Ectothiorhodospira and Halorhodospira. Surprisingly, A. mobile is an obligate aerobe. The organism grows optimally with a number of carboxylic acids (such as sodium acetate) as carbon source, at 2% (i.e. approximately 0.34 M) sodium chloride, at pH 9-10, and at temperatures ranging from 35 to 38 degrees C. The dominant cellular fatty acids of Alkalispirillum mobile are C12:0, C16:0, C18:1cis11, and C18:0; its G+C content is 66.2+/-0.5 mol%.

Original languageEnglish
Pages (from-to)369-75
Number of pages7
JournalArchives of Microbiology
Issue number5
Publication statusPublished - May 2001


  • Base Composition
  • Carboxylic Acids
  • Fatty Acids
  • Gammaproteobacteria
  • Hydrogen-Ion Concentration
  • Osmolar Concentration
  • Phylogeny
  • RNA, Ribosomal, 16S
  • Sequence Analysis, DNA
  • Sodium Chloride
  • Temperature
  • Journal Article


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