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一个新型原核诱导表达系统的建立

, PP. 145-149

Keywords: 群体感应,LuxR基因,AHLs,化学诱导基因表达,叶绿体表达载体

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Abstract:

群体感应是细菌依赖于种群密度进行信息交流、协调群体行为并调控基因表达的一种方式。海洋发光弧菌Vibriofischeri利用该机制合成化学物质N-酰基-高丝氨酸内酯(AHLs),与LuxR蛋白结合,随后驱动下游生物荧光基因的高量表达。基于植物叶绿体起源于原始古细菌-蓝藻的假设以及叶绿体内的转录、翻译机制与原核生物高度近似,构建了luxR基因调控下游报告基因GFP表达的叶绿体遗传转化载体。将该载体转入大肠杆菌后,当无外加信号物质AHLs时,GFP不表达;而外加AHLs后,GFP大量表达,证明luxR和GFP基因的组合在大肠杆菌中是理想的化学诱导基因表达系统,可应用于大肠杆菌基因功能的研究。

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