期刊
INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY
卷 64, 期 -, 页码 2089-2093出版社
MICROBIOLOGY SOC
DOI: 10.1099/ijs.0.063677-0
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- Japan Oil, Gas and Metals National Corporation (JOGMEC)
A mesophilic, slightly halophilic, obligately methylotrophic, methanogenic archaeon, designated strain GTA13(T), was isolated from natural gas-bearing confined aquifers in the Minami-Kanto gas field, Japan. The cells were non-motile, slightly irregular cocci, 0.7-1.0 mu m in diameter and occurred singly, in pairs or as small aggregates. The cells grew with tri- or dimethylamine but not with H-2/CO2, formate, acetate, methanol or dimethyl sulphide. Vitamins, sodium and magnesium were required for growth. Optimal growth occurred at pH 7.0-7.5, 35 degrees C, 0.35-0.40 M NaCl and 15-50 mM MgCl2. The NaCl range for growth was 0.2-1.3 M. The DNA G+C content was 43.7 mol%. Strain GTA13(T) showed highest levels of 16S rRNA gene sequence similarity with Methanohalophilus portucalensis FDF-1(T) (96.4% sequence similarity) and Methanohalophilus halophilus DSM 3094(T) (96.0%). On the basis of physiological and phylogenetic features, strain GTA13(T) is considered to represent a novel species of the genus Methanohalophilus, for which the name Methanohalophilus levihalophilus sp. nov. is proposed. The type strain is GTA13(T)(=NBRC 110099(T)=DSM 28452(T)). An emended description of the genus Methanohalophilus is also proposed.
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