1887

Abstract

Two novel actinobacteria with the ability to degrade kerosene, designated as B3033 and Y57, were isolated from mangrove sediments in Tieshan Harbour, South China Sea. Both strains are Gram-staining-positive, non-spore forming, slow-growing, oxidase-positive, non-motile and aerobic. Their major cellular fatty acids were C and Cω9. Analysis of 16S rRNA gene sequences revealed the close relationship of strain B3033 to DSM 107316 (99.4 % nucleotide identity) and strain Y57 to ATCC 27278 (98.7 %) and JS14 (98.7 %). Whole genome average nucleotide blast identity (ANI) and the digital DNA–DNA hybridization (dDDH) values between the two isolates and the type strains of species of the genus were lower than 94 and 45 %, respectively, which were below the threshold values of 95 % (for ANI) and 70 % (for dDDH) recommended for bacterial species differentiation. The genome sequence of B3033 comprised a circular 11.0 Mb chromosome with a DNA G+C content of 68.1 mol%. Y57 had a genome size of 5.6 Mb and a DNA G+C content of 68.7 mol%. Genes involved in degradation of aromatic compounds and copper resistance were identified in the genomes of both strains that could improve their adaptive capacity to the mangrove environment. These results combined with those of chemotaxonomic analyses, MALDI-TOF MS profiles and phenotypic analyses support the affiliation of these strains to two novel species within the genus , for which we propose the names sp. nov. B3033 (=KCTC 49712=MCCC 1K04526) and sp. nov. Y57 (=KCTC 49711=MCCC 1K04875) as type strains.

Funding
This study was supported by the:
  • Guangxi special talent base (Award AD22035020)
    • Principle Award Recipient: XinliPan
  • Guangxi natural science foundation for youth scholar (Award 2021GXNSFBA220020)
    • Principle Award Recipient: XinliPan
  • Guangxi natural science foundation for youth scholar (Award 2018GXNSFBA050021)
    • Principle Award Recipient: WenjinHu
  • Guangxi Key Laboratory of Marine Natural Products and Combinatorial Biosynthesis Chemistry (Award 17-259-74)
    • Principle Award Recipient: ShushiHuang
  • The Fundamental Research Funds for Guangxi Academy of Sciences (Award 2018YBJ303)
    • Principle Award Recipient: WenjinHu
  • The Fundamental Research Funds for Guangxi Academy of Sciences (Award 2019YBJ101)
    • Principle Award Recipient: XinliPan
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2022-10-25
2024-05-05
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