华西口腔医学杂志

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变形链球菌luxS基因同源重组克隆载体的构建实验

黄正蔚;刘正   

  1. 上海交通大学医学院附属第九人民医院  口腔内科,上海 200011
  • 收稿日期:2006-02-25 修回日期:2006-02-25 出版日期:2006-02-20 发布日期:2006-02-20
  • 通讯作者: 刘 正, Tel:021-63135412
  • 作者简介:黄正蔚(1975-),男,江苏人,讲师,博士
  • 基金资助:

    国家自然科学基金资助项目(30400497);上海市科委重点科研基金资助项目(04JC14066)

Construction of Streptococcus mutans luxS Gene Allelic Exchange Plasmid

HUANG Zheng-wei, LIU Zheng   

  1. Dept. of Oral Medicine, The Ninth Affiliated Hospital of Shanghai Jiaotong University School of Medicine, Shanghai 200011, China
  • Received:2006-02-25 Revised:2006-02-25 Online:2006-02-20 Published:2006-02-20

摘要:

 目的  构建luxS基因的同源重组克隆载体以备将来进行luxS基因同源重组knockout突变株的研究。方法  利用高保真的pfu DNA聚合酶,通过嵌套式PCR的方法,分别扩增出变形链球菌luxS基因的上下游片段(Xup,Xdn)以及大肠杆菌pH 1+质粒的卡那霉素抗性基因片段(Kana),依次采用相应的双酶切反应将这些片段连接入噬菌体载体pBluescript SK(+)Phagemids,以构建目的质粒Xukd-pbsk重组载体。结果  经酶切鉴定目的质粒各片段插入无误,插入片段的测序报告也显示碱基无错配,含目的质粒的菌株可在含30 mg/L卡那霉素的LB培养基内生长良好,证明插入的卡那霉素抗性基因体外表达良好。结论  本研究构建的变形链球菌luxS基因同源重组克隆载体正确,可用于今后对于变形链球菌luxS基因突变株构建的研究。

 

关键词: 变形链球菌, luxS基因, 同源重组克隆载体

Abstract:

Objective  It is reported that Streptococcus mutans luxS gene may have an important role in the interspecies quorum sensing system. To construct the S. mutans luxS gene knockout mutant, this research aim to construct the luxS gene allelic exchange plasmid. Methods  The upstream and downstream flank DNA fragments of S. mutans luxS gene(Xup, Xdn)and the E. coli kanamycin resistance gene(Kana) were enriched by pfu DNA polymerase with“nest PCR”methods. These fragments were ligated into pBluescript  SK(+)Phagemids vector with double endonuclease reaction sequentially. Results  With endonuclease reaction and DNA sequencing, it was proved that the objective plasmid, Xukd-pbsk, was constructed correctively and the kanamycin resistance gene could be expressed in vitro. Conclusion  The S. mutans luxS gene allelic exchange plasmid is constructed correctively in this research and can be used in the future research of S.mutans luxS gene knockout mutant.

Key words: Streptococcusmutans, luxSgene, allelicexchangeplasmidR