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Bacillus subtilis 168菌株产surfactin改造

DOI: 10.7685/j.issn.1000-2030.2014.06.014, PP. 97-102

Keywords: 同源重组,Bacillussubtilis168,surfactin,sfp基因,改造

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Abstract:

枯草芽孢杆菌(Bacillussubtilis)168菌株基因组中含有编码surfactin合成酶系的srfA操纵子,却不产抗菌肽surfactin。运用同源重组的方法将外源的有活性的sfp基因(编码4’-磷酸泛酰巯基乙胺基转移酶)整合入B.subtilis168中,将其改造为产surfactin的菌株。通过分析多株枯草芽孢杆菌和解淀粉液化芽孢杆菌(Bacillusamyloliquefaciens)的sfp基因,从基因的上、下游找出较为保守的区域,设计引物,从枯草芽孢杆菌Nja-9中扩增sfp基因,将获得的sfp基因与P43启动子和终止子相连,构建了sfp基因表达框,并连接于枯草整合质粒pDG1730上,最终构建了枯草芽孢杆菌整合质粒pST-1730,利用pST-1730本身的淀粉酶E基因与B.subtilis168菌株的基因组DNA进行同源重组整合,获得了产surfactin的重组菌株B.subtilis121。本研究为surfactin合成酶基因的改造和分析奠定了基础。

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