基础医学与临床 ›› 2015, Vol. 35 ›› Issue (4): 502-507.

• 研究论文 • 上一篇    下一篇

尿路致病性大肠埃希菌FYUA基因敲除株的构建及其生物学特性

邓聪1,彭亮2,邓小燕1,潘嘉韵1,吴晓蔓1   

  1. 1. 广州医科大学附属第二医院
    2. 南方医科大学
  • 收稿日期:2014-09-15 修回日期:2014-11-28 出版日期:2015-04-05 发布日期:2015-04-08
  • 通讯作者: 吴晓蔓 E-mail:wxm622@21cn.com
  • 基金资助:
    广州医科大学青年基金

Construction of uropathogenic Escherichia coli strain with FYUA gene deletion and its biological properties

  • Received:2014-09-15 Revised:2014-11-28 Online:2015-04-05 Published:2015-04-08

摘要: 目的 构建尿路致病性大肠埃希菌FYUA基因敲除株,比较野生株和敲除株之间生物学特性的改变。方法 利用λ Red同源重组系统构建FYUA基因敲除株△FYUA;测定A600绘制CFT073和△FYUA在LB液体培养基和无菌尿液中的增殖曲线;平板菌落计数法比较CFT073和△FYUA菌落形成能力;利用96孔板结晶紫染色法比较CFT073和△FYUA生物膜形成能力。结果 成功构建CFT073 FYUA基因敲除株△FYUA;CFT073和△FYUA在LB液体培养基中具有相似的增殖曲线,△FYUA在无菌尿液中的增殖速率明显低于CFT073(P <0.05);CFT073和△FYUA菌落形成能力无明显区别;△FYUA的生物膜形成能力低于CFT073(P <0.05)。结论 FYUA基因对于菌株在无菌尿液中的生长繁殖以及生物膜形成可能发挥重要作用。

关键词: FYUA基因, 基因敲除, 尿路感染, 大肠埃希菌

Abstract: Objective To construct a FYUA gene deletion mutant of uropathogenic Escherichia coli strain CFT073;To compare the different biological properties between wide-type and mutant.Methods λ Red homologous recombination technology was used to construct the FYUA gene deletion strain △FYUA. The proliferation curves of CFT073 and △FYUA in Luria-Bertani liquid medium and sterile urine were drawed by measuring the absorbance at 600nm.Colony formation abilities of CFT073 and △FYUA were evalutatd by counting the number of colonies in the plates.Crystal violet staining method was used to compare the biofilm formation abilities of CFT073 and △FYUA.Results A FYUA gene deletion strain △FYUA was constructed successfully. CFT073 and △FYUA had the similar proliferation curves in Luria-Bertani liquid medium.The proliferation rate of △FYUA in sterile urine was obviously slower than CFT073(P <0.05).There is no difference in colony formation ability between CFT073 and △FYUA. Biofilm formation ability of △FYUA was weakened compared with CFT073(P <0.05).Conclusion FYUA gene may plays an important role in the CFT073 proliferation and biofilm formation in sterile urine.

Key words: FYUA, gene knockout, urinary tract infection, Escherichia coli

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