食品科学 ›› 2010, Vol. 31 ›› Issue (21): 236-238.doi: 10.7506/spkx1002-6630-201021053

• 生物工程 • 上一篇    下一篇

食品中非O157大肠杆菌志贺毒素基因序列分析

李 睿1,戴诗皎1,戴 锴1,杜德龙1,朱廷恒2 ,*   

  1. 1.武汉工业学院生物与制药工程学院
    2.浙江工业大学生物与环境工程学院
  • 收稿日期:2010-01-11 修回日期:2010-07-25 出版日期:2010-11-15 发布日期:2010-12-29
  • 通讯作者: 朱廷恒 E-mail:thzhu@zjut.edu.cn
  • 基金资助:

    湖北省自然科学基金重点项目(2009CDA118)

Sequence Analysis of Shiga Toxin Gene from Non-O157 Escherichia coli Strain Isolated from Foods

LI Rui1,DAI Shi-jiao1,DAI Kai1,DU De-long1,ZHU Ting-heng2,*   

  1. 1. College of Biological and Pharmaceutical Engineering, Wuhan Polytechnic University, Wuhan 430023, China;
    2. College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310000, China
  • Received:2010-01-11 Revised:2010-07-25 Online:2010-11-15 Published:2010-12-29
  • Contact: ZHU Ting-heng E-mail:thzhu@zjut.edu.cn

摘要:

对一株从食品中分离的非O157产志贺毒素1型大肠杆菌(EC6)进行研究。将该菌株所产志贺毒素Stx1用 PCR扩增stx1 基因全长并克隆测序,其stx1 基因与GenBank 数据库收录的stx1 基因最高同源性为99%,表明EC6 发生了一定程度的基因突变。采用邻位相连法构建进化树,结果表明EC6 为stx1 基因亚型。

关键词: 产志贺毒素大肠杆菌, 食品, stx1 基因, 序列分析, 非O157 血清型

Abstract:

A non-O157 E. coli strain (named EC6) which produces Shiga toxin type 1 was isolated from beef and the sequence of its Shiga toxin gene was analyzed. The full length of stx1 gene from strain EC6 was amplified by PCR, cloned into the pGEM-T Easy vector and sequenced. The results showed that the stx1 gene of EC6 had up to 99% similarity with the stx1 sequences deposited in GenBank database, indicating the occurrence of mutation. Furthermore, a phylogenetic tree was constructed by neighborjoining method, and according to it the stx1 gene of EC6 was stx1 genotype.

Key words: Shiga toxin-producing E. coli, food, stx1 gene, sequence analysis, non-O157 serotype

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