Korean Journal of Microbiology (미생물학회지)

The Microbiological Society of Korea (한국미생물학회)
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Isolation and characterization of Bacillus amyloliquefaciens TK3 inhibiting causative bacteria of atrophic rhinitis and fowl typhoid

돼지위축성비염과 가금티푸스 병원균을 저해하는 Bacillus amyloliquefaciens TK3의 분리 및 특성 조사

  • Jung, Taeck-Kyung (Department of Biological Sciences, Kangwon National University) ;
  • Song, Hong-Gyu (Department of Biological Sciences, Kangwon National University)
  • 정택경 (강원대학교 자연과학대학 생명과학과) ;
  • 송홍규 (강원대학교 자연과학대학 생명과학과)
  • Received : 2015.02.16
  • Accepted : 2015.05.04
  • Published : 2015.06.30
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Abstract

For prevention of atrophic rhinitis of swine by Bordetella bronchiseptica and fowl typhoid by Salmonella gallinarum, bacterial strains showing antimicrobial activity against those pathogenic bacteria were isolated from various samples collected at animal farms. Among 372 bacterial isolates strain TK3 showed the highest antibacterial activity against both pathogens, and was identified as Bacillus amyloliquefaciens by 16S rRNA gene sequence analysis. B. amyloliquefaciens TK3 could inhibit growth of both pathogens by secretion of antibacterial compounds such as siderophore, rhamnolipid and antimicrobial peptide. Production radius of siderophore on Chrome azurol S agar plate by strain TK3 was 0.53 cm after 14 days of incubation, and concentration of siderophore in King's B medium was 1.06 mmol/ml. It also secreted 82.4 mg/L of rhamnolipid, and antimicrobial peptide that completely inhibited growth of both pathogens at concentration of $30{\mu}l/ml$ in LB medium.

Bordetella bronchiseptica에 의한 돼지위축성비염과 Salmonella gallinarum에 의한 가금티푸스 방지 방법을 찾기 위해서 두 세균병원체에 항균활성을 갖는 세균 균주를 축산농가의 여러 시료로부터 분리하였다. 분리균주 372개 중 TK3 균주가 두 병원체에 대해 가장 우수한 항균활성을 나타내었으며, 16S rRNA 염기서열 분석 결과 Bacillus amyloliquefaciens로 동정되었다. B. amyloliquefaciens TK3는 siderophore, rhamnolipid와 antimicrobial peptide 같은 항균물질을 분비하여 두 병원체의 생장을 저해할 수 있었다. TK3 균주는 Chrome azurol S 한천 평판에서 siderophore 생성반지름이 14일 배양 후 0.53 cm이었으며, King's B 배지에서 1.06 mmol/ml의 siderophore를 생성하였다. 또한 82.4 mg/L의 rhamnolipid를 분비하였으며, LB배지에 $30{\mu}l/ml$ 농도의 추출된 antimicrobial peptide 첨가 시 두 병원체의 생장을 완전히 저해하였다.

Keywords

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