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Lactococcus lactis subsp. cremoris ATCC 11602-A1의 Bacteriophage 저항성 기작에 관한 연구

Characteristics of the Bacteriophage Resistance Mechanism of Kactococcus lactis subsp.cremoris ATCC 11602-A1


The characteristics of the bacteriophage resistant Lactococcus lactis subsp. cremoris ATCC 11602-A1, the phage-resistant mutant of Lactococcus lactis subsp. cremoris ATCC 11602, was examined. Electron microscopic study of phage adsorption to A1 revealed that after 10 min. incubation of the host-phage mixture, A1 did not show phage adsorption, and after 60 min. did not show a real burst and the release of new phage particles which could be detected in the mixture of its parent strain and phage. However, the phage adsorption rate of A1 after SDS treatment increased to 98%. Moreover, when the cell walls from A1 and parent strain, and the polysaccharide(PS) and peptidoglycan(PG) of their cell wall were mixed with phage and incubated for 15 min., PS and PG from A1 did not bind phage, but only SD-treated cell wall bound phage, and the cell wall and PS of parent strain bound phage. Both A1 and parent strain treated with 0.2 N HCl-and 5% TCA(100$$C) did not bind phage. The results suggest that the phage receptor is still present in the cell wall of the A1, but a cell wall constituent hydrolyzed by SDS blocks phage adsorption by masking the phage receptor. It also suggests that the phage receptor of parent strain is associated with PS of the cell wall.

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참고문헌 (19)

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