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Exiguobacterium oxidotolerans sp. nov., a novel alkaliphile exhibiting high catalase activity

¹ National Institute of Advanced Industrial Science and Technology, Tsukisamu-Higashi, Toyohira-ku, Sapporo 062-8517, Japan
² Graduate School of Agriculture, Hokkaido University, Kita-ku, Sapporo 060-8589, Japan
³ Hokkaido Tokai University, Minaminosawa, Minami-ku, Sapporo 005-8601, Japan
⁴ School of Dentistry, Hokkaido University, Kita-ku, Sapporo 060-8586, Japan

Correspondence
Isao Yumoto
i.yumoto{at}aist.go.jp

A novel alkaliphile was isolated from a drain of a fish processing plant. The isolate grew at a pH range of 7–10. Cells were Gram-positive, facultatively aerobic, motile rods with peritrichous flagella. Colonies were orange or yellow in colour. Catalase and oxidase reactions were positive. The isolate grew in 0–12 % NaCl but not above 15 % NaCl. Its cell extract exhibited 567 times higher catalase activity than an Escherichia coli cell extract. The major cellular fatty acids were iso-C_{13 : 0}, anteiso-C_{13 : 0}, iso-C_{15 : 0}, iso-C_{16 : 0}, iso-C_{17 : 0}, anteiso-C_{17 : 0} and iso-C_{17 : 1}. Its DNA G+C content was 46·7 mol%. Phylogenetic analysis based on 16S rRNA gene sequencing and chemotaxonomic data indicated that strain T-2-2^T is a member of the genus Exiguobacterium. DNA–DNA hybridization revealed a low relatedness of the isolate to several phylogenetic neighbours (less than 25 %). On the basis of phenotypic characteristics, phylogenetic data and DNA–DNA relatedness data, the isolate merits classification as a novel species, for which the name Exiguobacterium oxidotolerans sp. nov. is proposed. The type strain is T-2-2^T (=JCM 12280^T=NCIMB 13980^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain T-2-2^T is AB105164.

Details of the catalase activity of strain T-2-2^T and reference strains are available as supplementary material in IJSEM Online.

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