Antonie van Leeuwenhoek

, Volume 104, Issue 6, pp 1005–1012

Methanomethylovorans uponensis sp. nov., a methylotrophic methanogen isolated from wetland sediment

Original Paper

DOI: 10.1007/s10482-013-0020-4

Cite this article as:
Cha, IT., Min, UG., Kim, SJ. et al. Antonie van Leeuwenhoek (2013) 104: 1005. doi:10.1007/s10482-013-0020-4

Abstract

A novel mesophilic, methylotrophic, methanogenic archaeon, designated strain EK1T, was enriched and isolated from wetland sediment. Phylogenetic analysis showed that strain EK1T was affiliated with the genus Methanomethylovorans within the family Methanosarcinaceae, and shared the highest 16S rRNA and methyl-coenzyme M reductase alpha-subunit gene sequence similarity with the type strain of Methanomethylovorans hollandica (98.8 and 92.6 %, respectively). The cells of strain EK1T were observed to be Gram-negative, non-motile and irregular cocci that did not lyse in 0.1 % (w/v) sodium dodecyl sulfate. Methanol, mono-, di- and trimethylamine, dimethyl sulfide and methanethiol were found to be used as catabolic and methanogenic substrates, whereas H2/CO2, formate, 2-propanol and acetate were not. Growth was observed at 25–40 °C (optimum, 37 °C), at pH 5.5–7.5 (optimum, pH 6.0–6.5) and in the presence of 0–0.1 M NaCl (optimum, 0 M). Growth and methane production rates were stimulated in the presence of H2/CO2 although methane production and growth yields were not significantly affected; acetate, formate, 2-propanol and CO/CO2/N2 did not affect methane production. CoCl2 (0.6–2.0 μM) and FeCl2 (25 mg/l) stimulated growth, while yeast extract and peptone did not. The DNA–DNA hybridization experiment revealed a relatedness of <20 % between EK1T and the type strains of the genus Methanomethylovorans. The DNA G+C content of strain EK1T was determined to be 39.2 mol%. Based on the polyphasic taxonomic study, strain EK1T represents a novel species belonging to the genus Methanomethylovorans, for which the name Methanomethylovorans uponensis sp. nov. is proposed. The type strain is strain EK1T(=NBRC 109636T = KCTC 4119T = JCM 19217T).

Keywords

Methanogen Methanomethylovorans uponensis Polyphasic taxonomy Wetland sediment 

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Department of MicrobiologyChungbuk National UniversityCheongjuRepublic of Korea
  2. 2.Jeju CenterKorea Basic Science InstituteChejuRepublic of Korea

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