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Int J Syst Evol Microbiol. 2014 Sep;64(Pt 9):3240-6. doi: 10.1099/ijs.0.063503-0. Epub 2014 Jun 30.

Methylocaldum marinum sp. nov., a thermotolerant, methane-oxidizing bacterium isolated from marine sediments, and emended description of the genus Methylocaldum.

Author information

1
Institute for Geo-resources and Environments, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan takeuchi-mio@aist.go.jp.
2
Bioproduction Research Institute, AIST, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan.
3
Department of Computational Biology, Graduate School of Frontier Sciences, the University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8561, Japan.
4
Institute of Geology and Geoinformation, AIST, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan.
5
The United Graduate School of Agricultural Sciences, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-8580, Japan.
6
Department of Physics and Astronomy Graduate School of Science and Engineering/Faculty of Science, Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-8580, Japan.
7
Department of Computational Biology, Graduate School of Frontier Sciences, the University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8561, Japan Genetic Research Section, Atmosphere and Ocean Research Institute, the University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa, Chiba 277-8564, Japan.
8
Institute for Geo-resources and Environments, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8567, Japan.

Abstract

An aerobic, methane-oxidizing bacterium (strain S8(T)) was isolated from marine sediments in Kagoshima Bay, Japan. Phylogenetic analysis based on 16S rRNA gene sequences indicated that this strain is closely related to members of the genus Methylocaldum (97.6-97.9 % similarity) within the class Gammaproteobacteria. Strain S8(T) was a Gram-staining-negative, non-motile, coccoid or short rod-shaped organism. The temperature range for growth of strain S8(T) was 20-47 °C (optimum growth at 36 °C). It required NaCl (>0.5 %), tolerated up to 5 % NaCl and utilized methane and methanol. The major cellular fatty acid and major respiratory quinone were C16 : 0 and 18-methylene ubiquinone 8, respectively. The DNA G+C content was 59.7 mol%. Strain S8(T) possessed mmoX, which encodes soluble methane monooxygenase, as well as pmoA, which encodes the particulate methane monooxygenase. On the basis of this morphological, physiological, biochemical and genetic information, the first marine species in the genus Methylocaldum is proposed, with the name Methylocaldum marinum sp. nov. The type strain is S8(T) ( = NBRC 109686(T) = DSM 27392(T)). An emended description of the genus Methylocaldum is also provided.

PMID:
24981325
DOI:
10.1099/ijs.0.063503-0
[Indexed for MEDLINE]

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