Identification of the Cell-envelope Proteinase of Lactic Acid Bacteria Isolated from Kimchi.

김치 유래 젖산균의 Cell-envelope Proteinase 존재 확인

  • 이유진 (경기대학교 식품생물공학과) ;
  • 최재연 (경기대학교 식품생물공학과) ;
  • 이형주 (서울대학교 식품공학과) ;
  • 장해춘 (조선대학교 식품영양학과) ;
  • 김정환 (경상대학교 식품공학과) ;
  • 정대균 (경희대학교 유전공학과 및 유전공학연구소) ;
  • 김영석 (이화여자대학교 식품영양학과) ;
  • 김소미 (제주대학교 아열대 원예산업 연구센터) ;
  • 이종훈 (경기대학교 식품생물공학과)
  • Published : 2002.06.01

Abstract

The partial 165 rDNA sequences of 6 lactic acid bacterial strains isolated from Kimchi were determined. Two strains were Leuconostoc mesenteroides and the rest were incorrectly classified and turned out to be Lactobacillus. As the case of dairy lactic acid bacteria, the strains isolated from Kimchi also had cell-envelope proteinase (CEP) activity. As the result of partial CEP gene amplification with CEP-specific primers, the expected 1.2-kb amplificate was obtained not from Leu. mesenteroides but from Lactobacillus strains. The deduced amino acid sequence of PCR product amplified from the genomic DNA of Lactobacillus pentosus KFR1821 showed 95% and 92% homology with those of PrtPs from Lactococcus lactis subsp. cremoris and Lactobacillus paracasei subsp. paracasei, respectively. The PCR amplificate was used as a probe and the result of Southern hybridization illuminated the location of CEP gene in chromosomal DNA of Lb. pentosus KFR1821.

김치로부터 분리된 젖산균들의 16S rDNA 부분 염기서열 결정 결과, 6균주 중 2균주는 Leuconostoc mesenteroides로, 나머지 균주는 Lactobacillus속으로 재동정되었다. 이들 김치유래 젖산균들은 유제품 유래 젖산균과 마찬가지로 cell-envelope proteinase (CEP)로 추정되는 세포외 proteinase 활성을 보유하고 있는 것으로 나타났고, 젖산균의 CEP 특이적 primer를 제작하여 PCR을 수행한 결과, Leu. mesenteroides로부터는 예상 크기의 PCR 산물이 증폭되지 않았지만 Lactobacillus속 균주들로부터는 예상되는 1.2 kb 의 DNA 단편이 증폭되었다. Lactobacillus pentosus KFR1821의 genomic DNA로부터 증폭된 PCR 산물의 추정 아미노산서열은 Lactococcus lactis subsp. cremoris의 PrtP와 95%, Labtobacillus paracasei subsp. paracasei이 PrtP와 92%의 높은 상동성을 보였다. 증폭된 PCR 산물을 probe로 하여 Southern hybridization을 수행한 결과, Lb. pentosus KFR1821의 CEP 유전자는 chromosomal DNA에 암호화 되어있는 것으로 확인되었다.

Keywords

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