Some Characteristics of Nisin Z, a Peptide Antibiotic Produced by Lactococcus lactis IO-1.
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概要
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<I>Lactococcus lactis </I>IO-1 isolated in our laboratory produces a peptide antibiotic, a natural nisin variant, nisin Z. Nisin Z was heat stable at acidic pH and showed a bactericidal mode of action against an indicator strain, <I>Bacillus subtilis </I>C1. The effect of proteolytic enzyme treatment on the activity and the antimicrobial spectrum were tested. These results indicated nearly the same characteristics as those of nisin A. In this study, it was found that two nisin variants (nisin Z and nisin A) were practically inactivated by proteinase K and actinase E. Interestingly, nisin-producing strains, <I>L. lactis </I>IO-1 and <I>L. lactis </I>NCDO 497 (a nisin A producer) were sensitive to a high concentration of nisin variants including their own products. The growth of a Gram-negative bacterium, <I>Escherichia coli</I>, was also inhibited by a high concentration of nisin, although nisin producers and Gram-negative bacteria are generally resistant to nisin variants.
- 社団法人 日本食品科学工学会の論文
著者
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Sonomoto Kenji
Laboratory Of Industrial Biochemistry Department Of Industrial Chemistry Faculty Of Engineering Kyot
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Ishizaki Ayaaki
Laboratory Of Microbial Science And Technology Division Of Bioscience And Biotechnology Graduate Sch
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MATSUSAKI Hiromi
Laboratory of Microbial Technology, Department of Food Science and Technology, Faculty of Agriculture, Kyushu University
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