미생물학회지 (Korean Journal of Microbiology)

  • 제42권4호
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  • Pages.299-305
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  • 2006
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  • 0440-2413(pISSN)
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  • 2383-9902(eISSN)
한국미생물학회 (The Microbiological Society of Korea)
권호 표지

D-Alaninepeptidase에 의한 세균의 삼투압 및 항생제에 대한 취약성 증가

D-Alaninepeptidase Increases the Vulnerability of Bacterial Cells to Osmotic Stress and Antibiotics

  • 송진수 (충북대학교 자연과학대학 생명과학부) ;
  • 이영남 (충북대학교 바이오연구소)
  • Song, Jin-Sue (Division of Life Sciences, Collegeof Natural Sciences, Chungbuk National University) ;
  • Lee, Young-Nam (Biotechnology Research Institute, Chungbuk National University)
  • 발행 : 2006.12.30
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초록

삼투압 환경에서 D-alaninepeptidase가 세균의 생존에 미치는 영향을 D-alaninepeptidase에 노출시킨 세균의 생존율로 살려본 바, 균을 D-alaninepeptidase와 삼투압에 동시에 노출시켰을 때, 균의 생존율이 대조군에 비하여 현저히 감소되었는데, 그람 양성 구균보다 그람 음성 간균의 생존감소율이 더욱 컸다. D-Alaninepeptidase와 높은 삼투압 환경에 노출시킨 균의 경우, 삼투압에만 노출시킨 대조군에 비하여 균체의 와해 또는 손상을 받은 비정형적 균의 수가 많이 증가했음을 주사전자현미경으로 관찰하였다. D-Alaninepeptidase와 항생제에 동시에 노출시킨 세균들(항생제 내성 균주 포함)의 항생제(gentamycin, vancomycin, kanamycin)에 대한 감수성을 원판확산법으로 살펴본바 D-alaninepeptidase에 노출시킨 세균들의 항생제 감수성이 증가하는 추세였는데 Proteus vulgaris 균주들의 vancomycin에 대한 감수성 증가는 괄목할 만하였다. 따라서 D-alaninepeptidase에 의하여 세균벽이 취약해져 삼투압이나 항생제 같은 외적 환경에 균이 민감해지는 것으로 사료된다.

D-Alaninepeptidase purified from Bacillus amyloliquefaciene CMB01 caused a reduction of survival of Proteus vulgaris, Klebsiella oxytoca, and Staphylococcus aureus placed under the osmotic pressure. D-Alaninepeptidase caused an increase of susceptibility of bacteria to antibiotics. An increased number of malformed cells in bacterial groups exposed to D-alaninepeptidase was observed by scanning electron microscopy. These data suggested that bacterial cells exposed to D-alaninepeptidase resulted in an increase of vulnerability of bacterial cells toward environmental stress, such as osmotic pressure and antibiotic substances.

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