KSBB Journal

  • 제31권4호
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  • Pages.228-236
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  • 2016
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  • 1225-7117(pISSN)
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  • 2288-8268(eISSN)
한국생물공학회 (The Korean Society for Biotechnology and Bioengineering)
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녹차 카테킨 EGCG의 노출에 따른 식중독 세균인 용혈성 Aeromonas sp. MH-8의 특성조사

Characterization of Hemolytic Aeromonas sp. MH-8 Responding to the Exposure of Green Tea Catechin, EGCG

  • 김동민 (순천향대학교 생명시스템학과) ;
  • 오계헌 (순천향대학교 생명시스템학과)
  • Kim, Dong-Min (Department of Life Science and Biotechnology, Soonchunhyang University) ;
  • Oh, Kye-Heon (Department of Life Science and Biotechnology, Soonchunhyang University)
  • 투고 : 2016.09.05
  • 심사 : 2016.11.25
  • 발행 : 2016.12.31
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초록

The aim of this study was to characterize the hemolytic Aeromonas sp. MH-8 exposed to green tea catechin, epigallocatechin gallate (EGCG). Initially, the hemolytic Aeromonas sp. MH-8 was enriched and isolated from stale fish. Bactericidal effects of MH-8 exposed to EGCG ranging from 1 mg/mL to 4 mg/mL were monitored, and complete bactericidal effects were achieved within 3 h at 3 mg/mL and higher concentrations. SDS-PAGE with silver staining revealed that the amount of lipopolysaccharides increased or decreased in the strain MH-8 treated to different concentrations and exposing periods of EGCG in exponentially growing cultures. The stress shock proteins (70-kDa DnaK and 60-kDa GroEL), which might contribute to enhancing the cellular resistance to the cytotoxic effect of EGCG, were induced at different concentrations of EGCG exposed to cell culture of MH-8. Scanning electron microscopic analysis demonstrated the presence of irregular rod shapes with umbilicated surfaces for cells treated with EGCG. 2-DE of soluble protein fractions from MH-8 cultures showed 18 protein spots changed by EGCG exposure. These proteins involved in chaperons (e.g., DnaK, GroEL and trigger factor), enterotoxins (e.g., aerolysin and phospholipase C precursor), LPS synthesis (e.g., LPS biosynthesis protein and outer membrane protein A precursor), and various biosynthesis and energy metabolism were identified by peptide mass fingerprinting using MALDI-TOF. In consequence, EGCG was found to have substantial antibacterial effects against food-poisoning causing bacterium, hemolytic Aeromonas sp. MH-8. Also the results provide clues for understanding the mechanism of EGCG-induced stress and cytotoxicity on Aeromonas sp. MH-8.

키워드

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