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Int J Syst Evol Microbiol 59 (2009), 2171-2175; DOI  10.1099/ijs.0.007120-0
© 2009 International Union of Microbiological Societies

Thiomonas bhubaneswarensis sp. nov., an obligately mixotrophic, moderately thermophilic, thiosulfate-oxidizing bacterium

Sujogya K. Panda1, V. Jyoti1, Bhaskar Bhadra2, Kinshuk C. Nayak1, Sisinthy Shivaji2, Fred A. Rainey3 and Subrata K. Das1

1 Department of Biotechnology, Institute of Life Sciences, Nalco Square, Bhubaneswar 751 023, India
2 Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
3 Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA

Correspondence
Subrata K. Das
subratkdas{at}hotmail.com
or
subrata{at}ils.res.in

A novel aerobic, obligately mixotrophic, moderately thermophilic, thiosulfate-oxidizing bacterium, S10T, was isolated from hot-spring sediment samples collected from Atri, Bhubaneswar, India. The cells of this isolate stained Gram-negative and were strictly aerobic, non-sporulating, rod-shaped and motile with a single polar flagellum. Strain S10T was positive for oxidase and catalase activities. It was capable of utilizing thiosulfate under mixotrophic growth conditions. Mixotrophic growth was observed at pH 6.0–8.5 and 25–45 °C; optimum growth occurred at pH 7.5–8.0 and 30–37 °C. The major cellular fatty acids were C12 : 0 3-OH, C16 : 1{omega}7c, C16 : 0, C17 : 0 cyclo, C18 : 1{omega}7c and C19 : 0 cyclo {omega}8c. The DNA G+C content of strain S10T was 64.8 mol%. 16S rRNA gene sequence analysis indicated that the bacterium clustered within the radiation of the genus Thiomonas and showed 98.0 % similarity with Thiomonas perometabolis ATCC 23370T and Thiomonas intermedia ATCC 15466T. However, DNA–DNA reassociation values of strain S10T with Thiomonas perometabolis JCM 20426T and Thiomonas intermedia JCM 20425T, its nearest phylogenetic relatives, were 46 and 39 %, respectively. On the basis of phenotypic, physiological and chemotaxonomic properties, 16S rRNA gene sequence analysis and DNA–DNA reassociation studies, it is proposed that strain S10T represents a novel species of the genus Thiomonas, Thiomonas bhubaneswarensis sp. nov.; the type strain is S10T (=DSM 18181T =JCM 14806T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain S10T is DQ092334.






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