Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Taxonomic characterization of novel Hymenobacter sp. B2 isolated from a freshwater environment

민물환경에서 분리된 novel Hymenobacter sp. B2의 분류학적 특성연구

  • Young-Min Bae (Department of Life Science and Public Health, Changwon University)
  • 배영민 (창원대학교 생명보건학부)
  • Received : 2023.05.30
  • Accepted : 2023.08.28
  • Published : 2023.08.31
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Abstract

The genus Hymenobacter, type genus of the family Hymenobacteraceae and a member of the phylum Bacteroidota includes gram-negative and red-pigmented rods. Those bacteria have been isolated from various environments of the earth. I isolated a red-pigmented, gram-negative rod from a pond in the campus of the Changwon University, Changwon, Kyeongnam and designated this bacterium as strain B2. Strain B2 was further analyzed phylogenetically and biochemically, and concluded as a member of genus Hymenobacter. BLAST search of the 16S rRNA gene sequence of strain B2 showed its homology lower than 98.7% with those sequences of the other bacteria whose 16S rRNA gene sequences have been reported. Fatty acid composition of the strain B2 was analyzed and its major fatty acids are summed feature 3(C16:1 ω7c and/or C16:1 ω6c, 22.8%), iso-C15:0 (16.2%), anteiso-C15:0(12.9%), C16:1ω5c(12.4%) and summed feature 4 (iso-C17:1 I/anteiso-C17:1)(9.5%) showing significant differences in fatty acid compositions between strain B2 and the other known Hymenobacter species. DNA sequence of 16S rRNA gene of strain B2 was deposited in genbank under accession number OQ318247.

Hymenobacter 속(genus)은 Bacteroidota 문(phylum), Hymenobacteraceae 과(family)의 대표 속(type genus)이다. 이 속에 속하는 세균들은 붉은색 색소를 함유하는 그람 음성 간균으로서, 자연계의 다양한 환경에서 분리되고 있다. 본 연구에서 붉은색 색소를 함유하는 그람 음성 간균이 경남 창원시 소재 창원대학교 교내의 연못에서 분리되었고, 이 세균은 균주 B2로 명명되었다. 균주 B2를 계통분석 및 생화학적으로 분석한 결과, Hymenobacter 속에 속하는 것으로 밝혀졌다. 이 세균의 16S rRNA 유전자 염기서열을 genbank의 BLAST로 분석해 본 결과, 다른 어떠한 세균과도 16S rRNA 유전자 염기서열의 상동성이 새로운 미생물로 인정되는 기준인 98.7%보다 낮은 것으로 나타났다. 균주 B2의 지방산을 분석해 본 결과, 주된 지방산은 summed feature 3(C16:1 ω7c and/or C16:1 ω6c, 22.8%), iso-C15:0(16.2%), anteiso-C15:0(12.9%), C16:1ω5c(12.4%) 및 summed feature 4 (iso-C17:1 I/anteiso-C17:1)(9.5%)인 것으로 밝혀졌는데, 결과적으로 균주 B2의 지방산 함량은 다른 Hymenobacter 종들의 지방산 함량과 뚜렷한 차이가 있는 것을 알 수 있었다. 이 세균의 16S rRNA 유전자 염기서열은 genbank에 accession number OQ318247로 등록되었다.

Keywords

Acknowledgement

This research was supported by Changwon National University in 2023~2024.

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