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1 Institute of Microbiology, Russian Academy of Sciences, Moscow 117312, Russia
2 Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, Pushchino, Moscow Region 142292, Russia
3 Max-Planck-Institut für terrestrische Mikrobiologie, D-35043 Marburg, Germany
Correspondence
Svetlana N. Dedysh
s.dedysh{at}mtu-net.ru
A novel species, Methylocella tundrae, is proposed for three methanotrophic strains (T4T, TCh1 and TY1) isolated from acidic Sphagnum tundra peatlands. These strains are aerobic, Gram-negative, non-motile, dinitrogen-fixing rods that possess a soluble methane monooxygenase and utilize the serine pathway for carbon assimilation. Strains T4T, TCh1 and TY1 are moderately acidophilic organisms capable of growth between pH 4·2 and 7·5 (optimum 5·5–6·0) and between 5 and 30 °C (optimum 15 °C). The major phospholipid fatty acid is 18 : 1
7c. The DNA G+C content of strain T4T is 63·3 mol%. The three strains possess almost identical 16S rRNA gene sequences and are most closely related to two previously identified species of Methylocella, Methylocella palustris (97 % similarity) and Methylocella silvestris (97·5 % similarity). DNA–DNA hybridization values of strain T4T with Methylocella palustris KT and Methylocella silvestris BL2T were respectively 27 and 36 %. Thus, the tundra strains represent a novel species, for which the name Methylocella tundrae sp. nov. is proposed. Strain T4T (=DSM 15673T=NCIMB 13949T) is the type strain.
Published online ahead of print on 25 July 2003 as DOI 10.1099/ijs.0.02805-0.
The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequence and partial sequences of the mmoX and mxaF genes of Methylocella tundrae strain T4T are respectively AJ555244, AJ555245 and AJ555246.
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