食品科学 ›› 2012, Vol. 33 ›› Issue (15): 201-205.

• 生物工程 • 上一篇    下一篇

纳豆菌抗菌脂肽对副溶血弧菌的抑菌机理探讨

刘唤明1,孙力军1,*,王雅玲1,徐德峰1,刘 阳2,陈 宏2,唐晓山3   

  1. 1.广东海洋大学食品科技学院 2.国家海产品质量监督检验中心(湛江) 3.湛江师范学院电镜室
  • 收稿日期:2011-06-30 修回日期:2012-07-18 出版日期:2012-08-15 发布日期:2012-09-07
  • 通讯作者: 刘唤明 E-mail:lhmgdhydx@sina.com
  • 基金资助:

    芽孢杆菌抗菌肽对海产品常见食源性致病菌的抑菌效应及其控制机制

Antibacterial Mechanism of Lipopeptide from Bacillus natto against Vibrio parahemolyticus

  • Received:2011-06-30 Revised:2012-07-18 Online:2012-08-15 Published:2012-09-07

摘要: 目的:对纳豆菌抗菌脂肽抑制副溶血弧菌的抑菌机理进行探讨。方法:通过纳豆菌抗菌脂肽对副溶血弧菌生长曲线、细胞超微结构、细胞膜通透性、细胞DNA的作用、细胞蛋白的合成、细胞代谢的影响等方面的研究,探讨纳豆菌抗菌脂肽抑制副溶血弧菌的机理。结果:抗菌脂肽可以使副溶血弧菌细胞膜通透性增加,使得细胞内具有紫外吸收的大分子物质泄漏到细胞外;扫描电镜结果表明抗菌脂肽可以导致副溶血弧菌细胞壁破裂或形成孔洞;抗菌脂肽能够和副溶血弧菌DNA体外结合,导致DNA最大吸收峰发生了轻微的蓝移,且产生增色效应;SDS-PAGE分析表明抗菌脂肽对副溶血弧菌蛋白表达未见有明显影响;当抗菌脂肽的质量浓度达到0.6 MIC以上时,其对副溶血弧菌代谢活力的抑制作用显著。结论:纳豆菌抗菌脂肽可使副溶血弧菌的细胞膜通透性增加,或形成孔洞导致细胞内一些物质泄漏,使细胞生长受到抑制,进而导致死亡。

关键词: 抗菌脂肽, 纳豆菌, 副溶血弧菌, 抑菌机理

Abstract: Objective:To investigate the antibacterial mechanism of lipopeptide from Bacillus natto against Vibrio parahemolyticus. Method: The effects of antibacterial lipopeptide from Bacillus natto on the growth, cell ultrastructure, cell membrane permeability, protein synthesis, and respiratory metabolism of Vibrio parahemolyticus were evaluated. Results: The antibacterial lipopeptide increased cell membrane permeability of Vibrio parahemolyticus, causing intracellular macromolecules with ultraviolet absorption to leak out of the cells. Under scanning electron microscope, it was observed that the cell wall of Vibrio parahemolyticus was ruptured by the antibacterial lipopeptide and holes were formed. The antibacterial lipopeptide could be bound to DNA from Vibrio parahemolyticus in vitro, resulting in slight blue shift of DNA maximum absorption and hyperchromic effect. SDS-PAGE suggested that the antibacterial lipopeptide had no apparent effect on protein synthesis in Vibrio parahemolyticus cells. The respiratory metabolism of Vibrio parahemolyticus was strongly inhibited by the antibacterial lipopeptide when its concentration was higher than 0.6 MIC. Conclusion: The antibacterial lipopeptide from Bacillus natto increases cell membrane permeability of Vibrio parahemolyticus, causing intracellular materials to leak out of the cells and consequently resulting in growth inhibition and even death of the cell.

Key words: antibacterial lipopeptide, Bacillus natto, Vibrio parahemolyticus, antibacterial mechanism

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