Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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Characteristics of Pichia anomala K15 Producing Killer Toxin Isolated from Traditional Nuruk

전통 누룩으로부터 분리된 Killer Toxin 생산 균주 Pichia anomala K15의 특성

  • 정희경 (대구신기술사업단 바이오산업지원센터) ;
  • 박치덕 (대구신기술사업단 바이오산업지원센터) ;
  • 이기동 (대구신기술사업단 바이오산업지원센터) ;
  • 박승춘 (경북대학교 수의과대학) ;
  • 박환희 (하향주가) ;
  • 홍주헌 (대구신기술사업단 바이오산업지원센터)
  • Published : 2007.08.30
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Abstract

In this study, killer yeasts were isolated from traditional Nuruk to improve storage and suppress contaminant in food industry. Among killer yeasts, yeast K15 showed strong killer toxin activity and inhibited growth of Salmonella Typhimurium and Vibrio parahaemolyticus. Killer yeast K15 was identified with Pichia anomala by the Microlog TM 4.0 identification system and homology of the ITS sequence. Killer toxin generated from P. anomala K15 was inactivated by pronase E and suggested to be a protein. Therefore killer toxin of P. anomala K15 was thought to be safe in human such as bacteriocin. P. anomala K15 was sufficient for growth in 50% glucose and could be used to prevent contaminant in initial stages of alcohol beverage fermentation.

본 연구에서는 발효식품의 저장기간을 연장하거나 이상발효를 방지하기 위해 미생물 유래의 천연 항균성 물질인 killer toxin 생산 균주인 K3, K5, K11, K12, K15를 전통누룩으로부터 분리하였다. 분리된 killer toxin 생산 균주 중 식중독의 원인균인 Salmonella Typhimurium 및 장염비브리오의 원인균인 Vibrio parahaemolyticus의 생육을 저해하며, killer toxin 활성이 가장 우수한 K15를 최종 선발하고 이를 Biolog사 동정시스템과 ITS영역의 염기서열 homology를 조사하여 동정한 결과, Pichia anomala에 99% 상동성을 나타내어 Pichia anomala K15로 명명하였다. P. anomala K15가 생산하는 killer toxin은 단백질 분해효소에 의해 불활성화 되므로 인체에서 단백질 분해효소에 의해 쉽게 분해가 가능한 안전한 항균물질임을 확인할 수 있었다. 또한 p. anomala K15는 에탄올 내성은 약하나 고농도의 당에서 저항성이 크므로 주조 발효초기 환경에서의 이상발효를 방지할 수 있을 것으로 사료되어진다.

Keywords

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