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Volume 74, Issue 4

sp. nov., a type I methane-oxidizing bacterium from a secondary sedimentation tank of a wastewater treatment plant No Access

Abstract

An aerobic methanotroph was isolated from a secondary sedimentation tank of a wastewater treatment plant and designated strain OY6. Cells of OY6 were Gram-stain-negative, pink-pigmented, motile rods and contained an intracytoplasmic membrane structure typical of type I methanotrophs. OY6 could grow at a pH range of 4.5–7.5 (optimum pH 6.5) and at temperatures ranging from 20 °C to 37 °C (optimum 30 °C). The major cellular fatty acids were C, Cω7/Cω6 and Cω5; the predominant respiratory quinone was MQ-8. The genome size was 5.41 Mbp with a DNA G+C content of 51.7 mol%. OY6 represents a member of the family of the class and displayed 95.74–99.64 % 16S rRNA gene sequence similarity to the type strains of species of the genus . Whole-genome comparisons based on average nucleotide identity (ANI) and digital DNA–DNA hybridisation (dDDH) confirmed that OY6 should be classified as representing a novel species. The most closely related type strain was EbB, with 16S rRNA gene sequence similarity, ANI by (ANIb), ANI by MUMmer (ANIm) and dDDH values of 99.64, 90.46, 91.92 and 44.5 %, respectively. OY6 possessed genes encoding both the particulate methane monooxygenase enzyme and the soluble methane monooxygenase enzyme. It grew only on methane or methanol as carbon sources. On the basis of phenotypic, genetic and phylogenetic data, strain OY6 represents a novel species within the genus for which the name sp. nov. is proposed, with strain OY6 (=GDMCC 1.4114=KCTC 8159=LMG 33371) as the type strain.

  • Received:
  • Accepted:
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Keyword(s): methane oxidation , methanotroph , Methylomonas and sediment tank
Funding
This study was supported by the:
  • Chongqing Natural Science Foundation (Award CSTB2022NSCQ-MSX0524)
    • Principle Award Recipient: NotApplicable
  • Shanghai Committee of Science and Technology (Award 21ZR1435500)
    • Principle Award Recipient: NotApplicable
  • Shanghai Committee of Science and Technology (Award 19390743300)
    • Principle Award Recipient: NotApplicable
  • Zhejiang Province ecological Environment Research and Promotion Project (Award 2020HT0009)
    • Principle Award Recipient: NotApplicable
  • Open Project Program of State Key Laboratory for Biology of Plant Diseases and Insect Pests (Award SKLOF202201)
    • Principle Award Recipient: NotApplicable
  • Open Project Program of State Key Laboratory of Rice Biology (Award 20190109)
    • Principle Award Recipient: NotApplicable
  • National Natural Science Foundation of China (Award 32302294)
    • Principle Award Recipient: NotApplicable
  • National Natural Science Foundation of China (Award 32200142)
    • Principle Award Recipient: NotApplicable
  • National Natural Science Foundation of China (Award 32272479)
    • Principle Award Recipient: BoZhu
© 2024 The Authors
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Methylomonas defluvii sp. nov., a type I methane-oxidizing bacterium from a secondary sedimentation tank of a wastewater treatment plant
Int J Syst Evol Microbiol 74, 006321 (2024); https://doi.org/10.1099/ijsem.0.006321
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