食品科学 ›› 2011, Vol. 32 ›› Issue (19): 165-169.doi: 10.7506/spkx1002-6630-201119036

• 生物工程 • 上一篇    下一篇

富含S-层蛋白乳酸细菌的鉴定及其消化酶耐受性研究

肖荣,范郁冰,王远亮,李宗军   

  1. 1.食品科学与生物技术湖南省重点实验室,湖南农业大学食品科学与技术学院 2.湖南省发酵食品工程技术研究中心 3.国家植物功能成分利用工程技术研究中心,湖南农业大学
  • 发布日期:2011-10-12
  • 基金资助:
    国家“863”计划项目(2007AA10Z347);湖南省研究生科研创新项目(54040108005/12254)

Identification of a Lactic Acid Bacteria Strain Rich in Surface (S)-Layer Protein and Its Tolerance to Digestive Enzymes

XIAO Rong1,FAN Yu-bing1,WANG Yuan-liang1,2,LI Zong-jun1,2,3,*   

  1. (1. Hunan Provincial Key Laboratory of Food Science and Biotechnology, College of Food Science and Technology, Hunan Agricultural University, Changsha 410128, China;2. Hunan Provincial Engineering and Technology Center for Fermented Food, Changsha 410128, China;3. National Research Center of Engineering Technology for Utilization of Functional Ingredients from Botanicals, Hunan Agricultural University, Changsha 410128, China)
  • Published:2011-10-12

摘要: 通过平板划线分离法从新鲜牛奶中筛选获得一株乳酸菌菌株,命名为M8,SDS-PAGE 分析该菌株富含S-层蛋白。结合表型特征、生理生化特征与16S rRNA基因序列分析法,鉴定该菌株为短乳杆菌(Lactobacillus brevis)。对其人工消化液耐受性分析,结果显示:其对人工胃液(3.0g/L,pH2.5)具有良好耐受能力,能在人工肠液(10g/L,pH8.0)中增殖,且S-层蛋白具有耐消化酶酶解能力。提示S-层蛋白作为保护屏障,可抵抗消化酶的作用。

关键词: 乳酸菌, S-层蛋白, 消化酶, 耐受

Abstract: A strain of lactic acid bacteria was isolated from fresh milk by plate streaking method. The isolated strain was named as M8, which was rich in S-layer protein according to sodium dodecyl sulfonate polyacrylamide gel electrophoresis (SDS-PAGE) analysis. The strain was identified as the species of Lactobacillus brevis via morphological observation, physiological and biochemical characteristics, and phylogenetic analysis of 16S rRNA sequences. Its excellent tolerance was found during sequential suspension at 37 ℃ in a mimic gastric juice (pH 2.5) containing pepsin (3 g/L) and citric acid-phosphate buffer (100 mmol/L) and then in a mimic small intestinal juice (pH 8.0) containing trypsin (10 g/L) and Tris-HCl buffer (25 mmol/L). Therefore, S-layer protein may function as a protective barrier and resist the invasion of digestive enzymes.

Key words: lactic acid bacteria, S-layer protein, digestive enzyme, tolerance

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