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Int J Syst Evol Microbiol 56 (2006), 1945-1951; DOI  10.1099/ijs.0.63981-0
© 2006 International Union of Microbiological Societies

Thiorhodococcus mannitoliphagus sp. nov., a purple sulfur bacterium from the White Sea

Sandra Rabold1, Vladimir M. Gorlenko2 and Johannes F. Imhoff1

1 Leibniz Institut für Meereswissenschaften IFM-GEOMAR, Düsternbrooker Weg 20, D-24105 Kiel, Germany
2 Winogradsky Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, k. 2, Moscow, 117312, Russia

Correspondence
Johannes F. Imhoff
jimhoff{at}ifm-geomar.de

A novel purple sulfur bacterium, strain WST, was isolated from a microbial mat from an estuary of the White Sea. Individual cells are coccoid shaped, motile by flagella and do not contain gas vesicles. The mean cell diameter is 1.85 µm (range 1.5–2.0 µm). Cell suspensions exhibit a purple–violet colour. They contain bacteriochlorophyll a and carotenoids of the rhodopinal series as photosynthetic pigments. The novel bacterium is an anoxygenic photoautotroph, using sulfide, thiosulfate, sulfite and elemental sulfur as electron donors for photosynthesis and is capable of photoassimilating several organic carbon sources in the presence of carbonate and a reduced sulfur source (sulfide and/or thiosulfate). Sulfur globules, formed during oxidation of sulfide, are stored transiently inside the cells. Optimal salinity and pH for growth are at 0.5–2.0 % NaCl and pH 7.0–7.5. The DNA base composition of strain WST is 61.8 mol% G+C. 16S rRNA gene sequence analysis showed that the new isolate belongs to the genus Thiorhodococcus, with Thiorhodococcus minor CE2203T as the nearest relative (sequence similarity of 97.3 %). Several distinct differences from described species necessitate the description of a novel species. Thiorhodococcus mannitoliphagus sp. nov. is the proposed name, with strain WST (=ATCC BAA-1228T=VKM B-2393T) as the type strain.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain WST is AJ971090.




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P. Anil Kumar, T. S. Sasi Jyothsna, T. N. R. Srinivas, Ch. Sasikala, Ch. V. Ramana, and J. F. Imhoff
Two novel species of marine phototrophic Gammaproteobacteria: Thiorhodococcus bheemlicus sp. nov. and Thiorhodococcus kakinadensis sp. nov.
Int J Syst Evol Microbiol, November 1, 2007; 57(11): 2458 - 2461.
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