1887

Abstract

A novel thermophilic, obligately methylotrophic, methanogenic archaeon, strain L2FAW, was isolated from a thermophilic laboratory-scale upflow anaerobic sludge blanket reactor fed with methanol as the carbon and energy source. Cells of strain L2FAW were non-motile, irregular cocci, 0·7–1·5 μm in diameter and usually occurred singly (sometimes forming clusters of two or four cells). The cells stained Gram-negative and lysed immediately in 0·1 % (w/v) SDS. Growth was inhibited by chloramphenicol and tetracycline, but not by penicillin, bacitracin, spectinomycin, vancomycin or kanamycin. Methanol and mono-, di- and trimethylamine were used as substrates, but H/CO, formate, acetate, propanol, dimethyl sulfide and methanethiol were not. The temperature range for growth was 42–58 °C, with an optimum at 50 °C. The fastest growth was observed at a salinity below 100 mM NaCl; no growth occurred above 300 mM NaCl. The optimal pH for growth was 6·5; growth was observed from pH 5 to pH 7·5. The G+C content of the genomic DNA was 37·6 mol%. Analysis of the 16S rRNA gene sequence and the partial methyl-CoM reductase gene sequence revealed that the organism was phylogenetically closely related to DMS1 (98 % similarity for the 16S rRNA gene sequence and 91 % similarity for the methyl-CoM reductase gene sequence). The DNA–DNA relatedness between L2FAW and DMS1 was 46 %. On the basis of these results, strain L2FAW (=DSM 17232=ATCC BAA-1173) represents the type strain of a novel species, for which the name sp. nov. is proposed.

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2005-11-01
2020-09-22
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