Enterococcus faecium MJ5-14가 생산한 박테리오신의 항리스테리아 활성

Antilisterial Activity of Bacteriocin Produced by Enterococcus faecium MJ5-14

  • Lim, Sung-Mee (Department of Hotel Culinary Arts, Tongmyong College) ;
  • Lee, Jong-Gab (Department of Hotel Culinary Arts, Tongmyong College) ;
  • Park, Mi-Yeon (Deparment of Food Science and Technology, Pukyong National University) ;
  • Chang, Dong-Suck (Deparment of Food Science and Technology, Pukyong National University)
  • 발행 : 2004.09.01

초록

우리나라 고유의 전통발효 식품인 메주로부터 항리스테리아 활성을 나타내는 유산균을 분리한 후 동정한 결과 E. faecium MJ5-14로 명명되었으며, 이들의 박테리오신은 MRS broth 중에 $37^{\circ}C$에서 12-18시간 배양하는 동안 최대의 활성을 나타내었다. L. monocytogenes KCTC 3569와 KCTC 3710 및 L. ivanovii subsp. ivanovii에 대한 박테리오신의 활성은 640 BU/mL이었고, L. innocua ATCC 33090, L. ivanovii ATCC 19119, L. grayi KCTC 3581 및 L. seeliger KCTC 3591에 대한 활성은 1280 BU/mL으로 나타났다. L. monovytogenes KCTC 3569와 E. faecium MJ5-14을 혼합 배양한 경우 L. monocytogenes의 감소 효과는 $25^{\circ}C$이하 보다는 E. faecium MJ5-14의 박테리오신 생산 최적 온도인 $37^{\circ}C$에서 더 높게 나타났으며, E. faecium MJ15-14의 박테리오신 항균 효과는 L. monocytogenes KCTC 3569의 초기 균수와 첨가한 박테리오신의 양에 따라 좌우하는 L. monocytogenes의 초기 균수가 적고, 박테리오신의 첨가량이 많을수록 항균효과가 높아짐을 확인하였다. 또한 박테리오신 70 BU/mL 첨가에 의한 항균 효과는 균 증식이 활발한 대수증식기 중반 이후 보다는 유도기 내지는 대수증식기 초반부에 더 크게 나타났다. 한편, 박테리오신 25 BU/mL을 첨가에 의해서 L. monocytogenes KCTC 3569 새포벽의 일부가 얇아지고, 50 BU/mL 이상의 농도에 의해선 세포막이 파괴되면서 세포 내용물의 유출 현상이 관찰되었다.

Enterococcus faecium MJ5-14 isolated from Meju produced a bacteriocin, which was antagonistic towards Listeria monocytogenes. Bacteriocin activity reached a maximum (640 BU/mL) after incubation for 12 hr, the early stationary phase, then dropped after the late stationary phase. Bacterocin of E. faecium MJ5-14 was extremely active against a wide range of Listeria species, including L. monocytogenes with sensitives up to about 640 BU/mL. In case of mixed culture with 105 CFU/mL L. monocytogenes and 105 CFU/mL E. faecium MJ5-14, the inhibitory effect against L. monocytogenes at $37^{\circ}C$ was higher than at $25^{\circ}C$. The mode of action was identified as bactericidal, because the addition of 100 BU/mL this bacteriocin to cell suspensions of L. monocytogenes KCTC 3569, led to a marked decrease in the number of viable cells. Further, when held in contact with bacteriocin of E. faecium MJ15-14 for 12 hr, L. monocytogenes KCTC 3569 displayed the disruption of the cells and an important efflux of the intracellular material.

키워드

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