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Int J Syst Evol Microbiol 56 (2006), 1531-1534; DOI  10.1099/ijs.0.64203-0
© 2006 International Union of Microbiological Societies

Thermaerobacter litoralis sp. nov., a strictly aerobic and thermophilic bacterium isolated from a coastal hydrothermal field

Reiji Tanaka, Satoshi Kawaichi, Hiroshi Nishimura and Yoshihiko Sako

Laboratory of Marine Microbiology, Graduate School of Agriculture, Kyoto University, Kitashirakawa-oiwake, Kyoto 606-8502, Japan

Correspondence
Reiji Tanaka
tanakar{at}kais.kyoto-u.ac.jp

A novel thermophilic bacterium, strain KW1T, was isolated from a coastal hydrothermal field on the Satsuma Peninsula, Kagoshima Prefecture, Japan. The variably Gram-stained cells were motile rods with flagella, did not form spores and proliferated at 52–78 °C (optimum, 70 °C), pH 5–8 (optimum, pH 7) and 0–4.5 % NaCl (optimum, 1.0 %). The novel isolate was a strictly aerobic heterotroph that utilized complex proteinaceous substrates as well as a variety of carboxylic acids and amino acids. The G+C content of the genomic DNA was 70.8 mol%. Analysis of 16S rRNA gene sequences indicated that strain KW1T is closely related to Thermaerobacter subterraneus C21T (98.4 % sequence similarity). However, the DNA–DNA hybridization value for strain KW1T and T. subterraneus ATCC BAA-137T was below 46 %. On the basis of the molecular and physiological traits of strain KW1T, it represents a novel species of the genus Thermaerobacter, for which the name Thermaerobacter litoralis sp. nov. is proposed. The type strain is KW1T (=JCM 13210T=DSM 17372T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain KW1T is AY936496.






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