食品科学 ›› 2017, Vol. 38 ›› Issue (8): 6-10.doi: 10.7506/spkx1002-6630-201708002

• 生物工程 • 上一篇    下一篇

产细菌素屎肠球菌TRS5特性分析及其编码基因的扩增

荣梓娴,王蓉蓉,肖 茜,刘成国,周 辉   

  1. 湖南农业大学食品科学技术学院,食品科学与生物技术湖南省重点实验室,湖南 长沙 410128
  • 出版日期:2017-04-25 发布日期:2017-04-24
  • 基金资助:
    国家自然科学基金面上项目(31571811);湖南省教育厅科学研究项目(16K043)

Characterization of Enterococcus faecalis TRS5, a Strain Able to Produce Bacteriocin and PCR Amplification of Its Bacteriocin-Encoding Genes

RONG Zixian, WANG Rongrong, XIAO Qian, LIU Chengguo, ZHOU Hui   

  1. Hunan Provincial Key Laboratory of Food Science and Biotechnology, College of Food Science and Technology, Hunan Agricultural University, Changsha 410128, China
  • Online:2017-04-25 Published:2017-04-24

摘要: 屎肠球菌TRS5在37 ℃、pH 6.5的MRS培养基中经过24 h的培养后,其细菌素生成量达到最大。培养基中添加胰蛋白胨或葡萄糖有利于促进TRS5细菌素的生成,而添加麦芽糖、乳糖或甘露糖(20 g/L)后细菌素活性减少50%。外源添加5 g/L的甘油和吐温-80会抑制TRS5细菌素的产生,而添加K2HPO4或VB1、VB2、VB6、VC则对细菌素的生成没有影响。药敏实验证实屎肠球菌TRS5对红霉素、氯霉素、万古霉素、替考拉宁、四环素、青霉素敏感。聚合酶链式反应及测序结果证实屎肠球菌TRS5含有肠球菌素enterocin P和类L50的结构基因。

关键词: 细菌素, 屎肠球菌, 细菌素的生成, 扩增

Abstract: The production of bacteriocin by Enterococcus faecium TRS5 was found to be maximum at 37 ℃ and pH 6.5 after 24 h of incubation in MRS broth. The presence of tryptone or glucose in the medium stimulated the bacteriocin production. Added maltose, lactose or mannose (20 g/L) resulted in a 50% reduction of bacteriocin activity. High levels of glycerol and Tween-80 (5 g/L) also repressed the bacteriocin production. The presence of K2HPO4 or vitamins VB1, VB2, VB6, or VC in the medium had no effect on the bacteriocin production. E. faecalis TRS5 was sensitive to erythromycin, chloramphenicol, vancomycin, teicoplanin, tetracycline and penicillin G. PCR amplification and sequencing demonstrated that E. faecalis TRS5 harbored enterocin P and L50-like structural genes.

Key words: bacteriocin, Enterococcus faecalis, bacteriocin production, amplification

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