表皮葡萄球菌基因删除突变株构建方法的研究

娄强; 朱涛; 王家学;吴旸; 朱于莉; 瞿涤

微生物与感染 ›› 2008, Vol. 3 ›› Issue (1) : 11-16.

PDF(315 KB)
欢迎访问《微生物与感染》官方网站,今天是
PDF(315 KB)
微生物与感染 ›› 2008, Vol. 3 ›› Issue (1) : 11-16.
论著

表皮葡萄球菌基因删除突变株构建方法的研究

  • 娄强; 朱涛; 王家学;吴旸; 朱于莉; 瞿涤

作者信息 +

Methods of constructing Staphylococcus epidermidis gene mutants via different plasmids

  • LOU Qiang; ZHU Tao; Wang Jia-xue; WU Yang; Zhu Yu-li; QU Di

Author information +
文章历史 +

摘要

目的 探讨高效的表皮葡萄球菌基因删除突变株构建方法。方法 分别应用2种不同的穿梭质粒pMAD和pBT2,连接目的基因表皮葡萄球菌双组分信号转导系统arlS、saeRS和lytS的上下游片段,构建重组质粒,电转入金黄色葡萄球菌RN4220后转入表皮葡萄球菌1457,利用抗性和生物标志筛选出针对特定目的基因的突变株SE1457-ΔarlS、SE1457-ΔsaeRS和SE1457-ΔlytS,比较2种方法的优、缺点。结果 利用pMAD和pBT2分别构建基因删除同源重组质粒pMAD-ΔsaeRS、pBT2-ΔarlS和pBT2-ΔlytS,并均获得相应的表皮葡萄球菌基因删除突变株。在筛选过程中,以pMAD为载体构建基因删除突变株,仅需1轮抗性/蓝白斑筛选过程即获突变株;而以pBT2为载体构建基因删除突变株筛选方法,需经过5~10轮的筛选才可获得突变株。基因删除突变株经聚合酶链反应(PCR)和测序等鉴定确认。与野生株相比,SE1457-ΔarlS突变株的生物膜形成能力降低90.96%,而SE1457-ΔsaeRS和SE1457-ΔlytS株的生物膜形成能力略有增加。结论 以pMAD载体构建表皮葡萄球菌突变株比较快速和简便。

Abstract

Objective To construct Staphylococcus epidermidis gene knock-out mutants with different plasmids. Methods Recombinant plasmids were constructed for homologous recombination of the two component signal transduction system genes (arlS、saeRS and lytS) of S. epidermidis with two different shuttle plasmids, pMAD and pBT2, transformed to S. aureus RN4220 by electroporation and then transformed into S. epidermidis 1457. S. epidermidis mutants were selected using various antibiotics and biomarkers and identified by PCR and biochemistry experiments. Results With pMAD or pBT2 plasmid, we separately constructed S. epidermids genes knock-out homologous recombinant plasmids, pMAD-ΔsaeRS, pBT2-ΔarlS and pBT2-ΔlytS. S. epidermidis 1457 was transformed with the recombinant plasmids and the gene knocking out mutant was screened out, respectively. Only one cycle was needed for screening out SE1457-ΔsaeRS mutant and 5-10 cycles were required for screening out SE1457-ΔarlS and SE1457-ΔlytS mutant. The biofilm forming of SE1457-ΔarlS mutant decreased by 90.96% and no significant difference was observed between SE1457-ΔlytS、SE1457-ΔsaeRS mutants and SE1457 parent strain. Conclusion pMAD method can be used to construct S. epidermidis mutant strain simply and effectively.

关键词

pMAD / pBT2 / 表皮葡萄球菌 / 双组分信号转导系统

Key words

Gene knock out / pMAD / pBT2 / Staphylococcus epidermidis / Two component signal transduction system

引用本文

导出引用
娄强; 朱涛; 王家学;吴旸; 朱于莉; 瞿涤. 表皮葡萄球菌基因删除突变株构建方法的研究[J]. 微生物与感染. 2008, 3(1): 11-16

LOU Qiang; ZHU Tao; Wang Jia-xue; WU Yang; Zhu Yu-li; QU Di

.

Methods of constructing Staphylococcus epidermidis gene mutants via different plasmids

[J]. Journal of Microbes and Infections. 2008, 3(1): 11-16

表皮葡萄球菌基因删除突变株构建方法的研究" title="Share on Weibo" target="_blank">
PDF(315 KB)

Accesses

Citation

Detail

段落导航
相关文章

/