Microbiology and Biotechnology Letters (한국미생물·생명공학회지)

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Screening of Antimicrobial Activity of Marine-Derived Biomaterials against Fish Pathogens

해양 유래 미생물을 이용한 어류질병세균에 대한 항균활성 탐색

  • Kim, Dong-Hwi (Marine Applied Microbes and Aquatic Organism Disease Control Lab, Department of Aquatic Biomedical Sciences, School of Marine Biomedical Sciences & Marine and Environmental Research Institute, Jeju National University) ;
  • Park, So-Hyun (Marine Applied Microbes and Aquatic Organism Disease Control Lab, Department of Aquatic Biomedical Sciences, School of Marine Biomedical Sciences & Marine and Environmental Research Institute, Jeju National University) ;
  • Kim, Ji-Hyun (Marine Applied Microbes and Aquatic Organism Disease Control Lab, Department of Aquatic Biomedical Sciences, School of Marine Biomedical Sciences & Marine and Environmental Research Institute, Jeju National University) ;
  • Lee, Hae-Ri (Marine Applied Microbes and Aquatic Organism Disease Control Lab, Department of Aquatic Biomedical Sciences, School of Marine Biomedical Sciences & Marine and Environmental Research Institute, Jeju National University) ;
  • Heo, Moon-Soo (Marine Applied Microbes and Aquatic Organism Disease Control Lab, Department of Aquatic Biomedical Sciences, School of Marine Biomedical Sciences & Marine and Environmental Research Institute, Jeju National University)
  • 김동휘 (제주대학교 해양과학대학 수산생명의학과) ;
  • 박소현 (제주대학교 해양과학대학 수산생명의학과) ;
  • 김지현 (제주대학교 해양과학대학 수산생명의학과) ;
  • 이해리 (제주대학교 해양과학대학 수산생명의학과) ;
  • 허문수 (제주대학교 해양과학대학 수산생명의학과)
  • Received : 2017.08.24
  • Accepted : 2017.09.08
  • Published : 2017.09.28
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Abstract

The prevalence of infections due to pathogenic bacteria such as Edwardsiella tarda, Streptococcus parauberis, and Photobacterium phosphoreum in fish farms in Jeju Island and their management by marine-derived biomaterials was studied. In this study, we isolated eight spices type of marine-derived biomaterials from four sea areas of Jeju Island. An antibiotic disc susceptibility test confirmed that the isolated marine-derived biomaterials showed weak resistance only to oxytetracycline and penicillin and sensitivity to the other antibiotics tested, and antimicrobial activity against fish pathogens with the inhibitory zone of 22 mm, 18 mm, and 19 mm for MD-02, MD-04, and MD-06 against E. tarda strains, respectively, and 19 mm, 22 mm, 30 mm, and 29 mm for MD-01, MD-02, MD-04, and MD-06 against S. parauberis strains, respectively, while all the marine-derived biomaterials showed antibacterial activity against P. phosphoreum. Among the eight biomaterials selected, Bacillus subtilis MD-02 displayed the greatest antibacterial activity against the three tested fish pathogens and also displayed susceptibility to antibiotics. The growth of Bacillus subtilis MD-02 was greatest with the carbon source, dextrine; nitrogen source, peptone; and mineral source, $MgSO_4{\cdot}7H_2O$. Hence, the present study confirmed that the isolate B. subtilis MD-02 from Jeju Island could be a potential antimicrobial agent against fish pathogens and a potential pharmacotherapeutic agent.

제주도 육상 양식장에서 주로 발생하는 어류 질병세균인 Edward tarda, Streptococcus parauberis, Photobacterium phosphoreum에 대한 피해를 줄이고 치료하고자 해양유래 미생물을 이용하고자 한다. 본 연구진은 제주 지역 4개 해역에서 해양유래 미생물을 8종 분리하였다. 분리 된 해양유래 미생물을 이용하여 항생제 디스크에 대한 감수성 확인을 한 결과, Oxytetracycline과 penicillin에서만 약한 내성을 보일 뿐 나머지 항생제 디스크에 대해선 감수성을 보였다. 해양 유래 미생물을 이용하여 어류질병에 대한 항균활성을 확인한 결과 E. tarda에 대해선 MD-02, MD-04, MD-06이 각각 22 mm, 18 mm, 19 mm의 억제환이 나타났다. S. parauberis에 대해선 MD-01, MD-02, MD-04, MD-06이 각각 19 mm, 22 mm, 30 mm, 29 mm의 억제환이 나타났으며, P. Phosphoreum에 대해선 모든 해양 유래 미생물에서 항균활성을 보였다. 이 중 어류질병세균에 대하여 항균활성이 가장 좋으며 항생제에 감수성을 보이는 B. subtilis MD-02를 최종 선정하였다. B. subtilis MD-02의 배지조성은 탄소원에서는 Dextrine, 질소원에서는 Peptone, 무기염에서는 $MgSO_4{\cdot}7H_2O$에서 생육이 가장 활발한 것을 확인하였다. 이에 따라 해양에서 분리된 B. subtilis MD-02는 어류질병균주에 대한 항균활성을 가지는 동시에 향후 치료제로써의 가치가 있다고 사료된다.

Keywords

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