BrlR from Pseudomonas aeruginosa is a receptor for both cyclic di-GMP and pyocyanin.

BrlR from Pseudomonas aeruginosa is a receptor for both cyclic di-GMP and pyocyanin.
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来自铜绿假单胞菌的 BrlR 是环二 GMP 和绿脓素的受体

DOI:
10.1038/s41467-018-05004-y
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发表时间:
2018-07-02
影响因子:
16.6
通讯作者:
Gu L
Gu L
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Wang F;He Q;Yin J;Xu S;Hu W;Gu L

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铜绿假单胞菌的毒力因子绿脓菌素和胞内第二信使环二鸟苷酸单磷酸(c-di-GMP)在调节生物被膜形成和多药外排泵表达中起关键作用。然而,这两个信号通路之间的串扰仍然不清楚。在这里,我们表明,BrlR(PA 4878),以前确定为一个c-di-GMP响应转录调节因子,也作为绿脓菌素的受体。游离BrlR和c-di-GMP结合的BrlR的晶体结构揭示BrlR的DNA结合结构域包含两个独立的c-di-GMP结合位点,这两个位点都参与促进BrlR表达。此外,我们确定了一个绿脓菌素结合位点的C-末端多药结合结构域的基础上的BrlR-C结构域的复合物与绿脓菌素类似物。生化分析表明绿脓菌素以浓度依赖性方式增强BrlR-DNA结合和brlR表达。
The virulence factor pyocyanin and the intracellular second messenger cyclic diguanylate monophosphate (c-di-GMP) play key roles in regulating biofilm formation and multi-drug efflux pump expression in Pseudomonas aeruginosa. However, the crosstalk between these two signaling pathways remains unclear. Here we show that BrlR (PA4878), previously identified as a c-di-GMP responsive transcriptional regulator, acts also as a receptor for pyocyanin. Crystal structures of free BrlR and c-di-GMP-bound BrlR reveal that the DNA-binding domain of BrlR contains two separate c-di-GMP binding sites, both of which are involved in promoting brlR expression. In addition, we identify a pyocyanin-binding site on the C-terminal multidrug-binding domain based on the structure of the BrlR-C domain in complex with a pyocyanin analog. Biochemical analysis indicates that pyocyanin enhances BrlR-DNA binding and brlR expression in a concentration-dependent manner.
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