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

Volume 73, Issue 9

gen. nov., sp. nov., an extremely acidophilic and moderately thermophilic methanotroph belonging to the phylum Open Access

Abstract

The thermo-acidophilic aerobic methanotrophic bacterium, designated strain Kam1 was isolated from an acidic geothermal mud spring in Kamchatka, Russia. Kam1 is Gram-stain-negative, with non-motile cells and non-spore-forming rods, and a diameter of 0.45–0.65 µm and length of 0.8–1.0 µm. Its growth is optimal at the temperature of 55 °C (range, 37–60 °C) and pH of 2.5 (range, pH 1–6), and its maximal growth rate is ~0.11 h (doubling time ~6.3 h). Its cell wall contains peptidoglycan with -diaminopimelic acid. In addition to growing on methane and methanol, strain Kam1 grows on acetone and 2-propanol. Phylogenetically, it forms a distinct group together with other strains and with the candidate genus Methylacidimicrobium as a sister group. These findings support the classification of the strain Kam1 as a representative of a novel species and genus of the phylum . For this strain, we propose the name sp. nov. as the type species within gen. nov. Strain Kam1 (JCM 30608=KCTC 4682) is the type strain.

  • Received:
  • Accepted:
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Keyword(s): acidophile , methane , taxonomy , thermophile and verrucomicrobiae
Funding
This study was supported by the:
  • Norges Forskningsråd (Award 261923)
    • Principal Award Recipient: Nils-KåreBirkeland
© 2023 The Authors
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.
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2023-09-27
2026-01-12

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Methylacidiphilum kamchatkense gen. nov., sp. nov., an extremely acidophilic and moderately thermophilic methanotroph belonging to the phylum Verrucomicrobiota
Int J Syst Evol Microbiol 73, 006060 (2023); https://doi.org/10.1099/ijsem.0.006060
/content/journal/ijsem/10.1099/ijsem.0.006060
/content/journal/ijsem/10.1099/ijsem.0.006060
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