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科学通报  2012 

铜绿假单胞菌中pmpR基因对Ⅲ型分泌系统的调节

DOI: 10.1360/csb2012-57-6-424, PP. 424-430

Keywords: 铜绿假单胞菌,pmpR,基因,PQS,系统,Ⅲ型分泌系统,基因敲除

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Abstract:

铜绿假单胞菌中的Ⅲ型分泌系统(typeⅢsecretionsystem,T3SS)与其致病性密切相关.已有研究表明,Ⅲ型分泌系统受群体感应系统Rhl系统的负调节,而喹诺酮系统(PQS)又正调节Rhl系统.前期的研究中我们获得了1个对PQS系统起负调控的调节子PmpR.综合它们之间的相互关系,本研究探讨了pmpR基因与Ⅲ型分泌系统的关系.结果表明,T3SS中的相关基因exoS,exoT,exoY和exsD在pmpR基因突变体中的表达明显增强.EMSA实验结果表明,PmpR蛋白并不能与Ⅲ型分泌系统基因启动子相结合,说明PmpR对T3SS可能起间接调节.此外,PQS系统对Ⅲ型分泌系统也起负调节.由上述结果可知,pmpR基因不可能通过PQS系统来调节T3SS系统,其调节途径中可能还存在着一些未知蛋白介导这种关系.

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