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1 Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
2 Geological Survey of India, GSI Complex, DK-6, Sector-II, Bidhannagar, Kolkata 700 091, India
Correspondence
S. Shivaji
shivas{at}ccmb.res.in
An arsenic- and radiation-resistant bacterium, strain Wt/1aT, was isolated from water from an arsenic-contaminated aquifer located in the Chakdah district of West Bengal, India. The bacterium stains Gram-negative and is rod-shaped, non-motile, non-sporulating and red-pigmented. Cell-wall peptidoglycan contains ornithine as the diamino acid, MK-8 is the major menaquinone, C15 : 1 and C16 : 1 are the major fatty acids and the DNA G+C content of the organism is 65·8 mol%. Based on these phenotypic and chemotaxonomic characteristics, strain Wt/1aT was identified as a member of the genus Deinococcus. Strain Wt/1aT exhibited maximum 16S rRNA gene sequence similarity (95 %) with Deinococcus grandis; however, strain Wt/1aT exhibited only 14 % similarity to D. grandis IAM 13005T at the DNA–DNA level. Furthermore, strain Wt/1aT (compared to D. grandis IAM 13005T) is more resistant to arsenate and arsenite, is positive for arginine dihydrolase, utilizes a number of carbon sources and exhibits quantitative differences in fatty acid composition and qualitative differences in lipid composition. Strain Wt/1aT is identified as a novel species of the genus Deinococcus, for which the name Deinococcus indicus sp. nov. is proposed. The type strain of Deinococcus indicus is Wt/1aT (=MTCC 4913T=DSM 15307T).
Published online ahead of print on 12 September 2003 as DOI 10.1099/ijs.0.02758-0.
The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain Wt/1aT is AJ549111.
A table showing survival of Deinococcus species under UV light and a figure showing one-dimensional TLC of total lipid extracts from Deinococcus species are available as supplementary material in IJSEM Online.
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