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首页> 外文期刊>Journal of bacteriology >A Second Operator Is Involved in Pseudomonas aeruginosa Elastase (lasB) Activation
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A Second Operator Is Involved in Pseudomonas aeruginosa Elastase (lasB) Activation

机译:第二次操作员涉及假单胞菌铜绿假单胞菌酶(LASB)活化

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Pseudomonas aeruginosa LasB elastase gene (lasB) transcription is controlled by the two-component quorum-sensing system of LasR, and the autoinducer, 3OC12-HSL (N-3-[oxododecanoyl]homoserine lactone). LasR and 3OC12-HSL-mediated lasBactivation requires a functional operator sequence (OP1) in thelasB promoter region. Optimal activation oflasB, however, requires a second sequence of 70% identity to OP1, named OP2, located 43 bp upstream of OP1. In this study, we used sequence substitutions and insertion mutations inlasBp-lacZ fusion plasmids to explore the role of OP2 in lasB activation. Our results demonstrate that (i) OP1 and OP2 synergistically mediate lasB activation; (ii) OP2, like OP1, responds to LasR and 3OC12-HSL; and (iii) the putative autoinducer-binding domain of LasR is not required for synergistic activation from OP1 and OP2.
机译:假单胞菌铜绿假单胞菌 LASB弹性蛋白酶基因( LASB )转录由LASR的双组分批量传感系统和自动化器,3oC 12 控制-HSL( N -3- [OxododeCanoyl] HomoSerine内酯)。 LASR和3OC 12 -HSL介导的 LASB 激活需要在 LASB 启动子区域中的功能操作员序列(OP1)。然而,最佳激活 lasb 需要对OP1,名为OP2的OP1,位于OP1上游43bp的第二个序列。在本研究中,我们使用序列取代和插入突变在 LASB Lacz 融合质粒中,探讨OP2在 LASB 激活中的作用。我们的结果表明,(i)OP1和OP2协同介入 LASB 激活; (ii)op2,如op1,响应LASR和3oC 12 -hsl; (iii)来自OP1和OP2的协同激活,不需要LASR的推定的自动挤压器绑定域。

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