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Bacillus selenatarsenatis sp. nov., a selenate- and arsenate-reducing bacterium isolated from the effluent drain of a glass-manufacturing plant

Shigeki Yamamura¹, Mitsuo Yamashita², Noriyuki Fujimoto², Masashi Kuroda², Masami Kashiwa^3,, Kazunari Sei³, Masanori Fujita³ and Michihiko Ike³

¹ Water and Soil Environment Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan
² Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
³ Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan

Correspondence
Shigeki Yamamura
yshige{at}nies.go.jp

A facultatively anaerobic, selenate- and arsenate-reducing bacterium, designated strain SF-1^T, was isolated from a selenium-contaminated sediment obtained from an effluent drain of a glass-manufacturing plant in Japan. The bacterium stained Gram-positive and was a motile, spore-forming rod capable of respiring with selenate, arsenate and nitrate as terminal electron acceptors. The major cellular fatty acids of the strain were iso-C_{15 : 0}, iso-C_{17 : 1}10c and C_{16 : 1}7c alcohol. The G+C content of the genomic DNA was 42.8 mol%. Though the nearest phylogenetic neighbour was Bacillus jeotgali JCM 10885^T, with a 16S rRNA gene sequence similarity of 99.6 %, DNA–DNA hybridization studies showed only 14 % relatedness between these strains, a level that is clearly below the value recommended to delimit different species. This, together with the phenotypic differences (utilization of electron acceptors, NaCl tolerance), suggests that strain SF-1^T represents a novel species of the genus Bacillus, for which the name Bacillus selenatarsenatis sp. nov. is proposed. The type strain is SF-1^T (=JCM 14380^T=DSM 18680^T).

A figure showing a maximum-parsimony tree is available as supplementary material in IJSEM Online.

Present address: Japan Agency for Marine-Earth Science and Technology, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan.

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