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INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY logo International Journal of Systematic and Evolutionary Microbiology

Volume 64, Issue Pt_6

gen. nov., sp. nov., a methanotroph isolated from pond water Free

Abstract

Two novel methanotrophic strains, R-49797 and OS501, were isolated from pond water in South Africa and Japan, respectively. Strains R-49797 and OS501 shared 99.7 % 16S rRNA gene sequence similarity. Cells were Gram-stain-negative, non-motile cocci with a diplococcoid tendency and contained type I methanotroph intracytoplasmic membranes. The gene encoding particulate methane monooxygenase was present. Soluble methane monoooxygenase (sMMO) activity, the gene encoding sMMO and the gene encoding nitrogenase were not detected. Methane and methanol were utilized as sole carbon source. The strains grew optimally at 25–33 °C (range 20–37 °C) and at pH 6.3–6.8 (range 5.8–9.0). The strains did not support growth in media supplemented with 1 % (w/v) NaCl. For both strains, the two major fatty acids were Cω7 and C and the DNA G+C content was 65.6 mol%. The isolates belong to the family of the class and cluster most closely among the genera , and , with a 16S rRNA gene sequence similarity of 94.2 % between strain R-49797 and its closest related type strain ( VKM 14L). Based on the low 16S rRNA gene sequence similarities with its nearest phylogenetic neighbouring genera, the formation of a separate lineage based on 16S rRNA and gene phylogenetic analysis, and the unique combination of phenotypic characteristics of the two isolated strains compared with the genera , and , we propose to classify these strains as representing a novel species of a new genus, gen. nov., sp. nov., within the family . The type strain of is R-49797 ( = LMG 27482 = JCM 19379).

  • Published Online:
Funding
This study was supported by the:
  • Geconcerteerde Onderzoeksactie (GOA) of Ghent University (Award BOF09/GOA/005)
  • Flemish Fund for Scientific Research (Award FWO11/PDO/084)
  • Japan Society for the Promotion of Science (Award 22380052)
  • Japan Science and Technology Agency
© 2014 IUMS
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2014-06-01
2025-03-21
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Methyloparacoccus murrellii gen. nov., sp. nov., a methanotroph isolated from pond water
Int J Syst Evol Microbiol 64, 2100 (2014); https://doi.org/10.1099/ijs.0.057760-0
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