Identification of genes in the VirR regulon of Pectobacterium atrosepticum and characterization of their roles in quorum sensing-dependent virulence.

Identification of genes in the VirR regulon of Pectobacterium atrosepticum and characterization of their roles in quorum sensing-dependent virulence.
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黑腐果杆菌 VirR 调节子中基因的鉴定及其在群体感应依赖性毒力中的作用特征。

DOI:
10.1111/j.1462-2920.2012.02822.x
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发表时间:
2013
影响因子:
5.1
通讯作者:
Monson R
Monson R
中科院分区:
生物学2区
文献类型:
--
作者:
Monson R

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在经济上重要的植物病原体黑败果胶杆菌中,植物细胞壁降解酶和其他毒力决定因子的表达以细胞密度依赖性方式控制,称为群体感应(QS)。革兰氏阴性菌中的典型QS系统包含一种LuxI型蛋白,合成一种信号分子,以及一种LuxR型调节剂,对高于阈值浓度的信号分子作出响应。 已鉴定出了黑脓杆菌(LuxR-型毒力的中心阻遏物VirR),并表征了其对毒力的影响。在这里,我们使用染色质免疫沉淀(ChIP)和植物微阵列来定义更广泛的VirR调节子。通过ChIP微阵列鉴定了94个直接VirR靶标,并确定了共有VirR结合位点。将纯化的VirR用于靶启动子的DNA凝胶迁移试验,并通过外源性添加信号分子N-(3-氧代己酰基)-l-高丝氨酸内酯(OHHL)破坏VirR:启动子结合。 在OHHL不存在的情况下,VirR自抑制并直接激活rsmA的转录。最后,我们发现VirR直接调节铁载体的产生并控制游泳运动。这是第一份描述VirR直接靶点的报告,并提供了明确的证据,证明这种LuxR型蛋白可以在缺乏同源信号分子的情况下作为转录的激活因子和抑制因子在体内起作用。
In the economically important phytopathogen,Pectobacterium atrosepticum, expression of plant cell wall degrading enzymes and other virulence determinants is controlled in a cell density‐dependent fashion, termed quorum sensing (QS). Canonical QS systems in Gram‐negative bacteria contain a LuxI‐type protein, synthesizing a signalling molecule, and a LuxR‐type regulator, responding to the signalling molecule above threshold concentrations. InP. atrosepticum, the central LuxR‐type repressor of virulence, VirR, has been identified and its impacts on virulence characterized. Here we define the broader VirR regulon using chromatin immunoprecipitation (ChIP) andin plantamicroarrays. Ninety‐four direct VirR targets were identified by ChIP microarrays and a consensus VirR binding site was determined. Purified VirR was used in DNA gel shift assays on target promoters and VirR : promoter binding was disrupted by exogenous addition of the signalling molecule,N‐(3‐oxohexanoyl)‐l‐homoserine lactone (OHHL). VirR autorepressed, and directly activated the transcription ofrsmAin the absence of OHHL. Finally, we showed that VirR directly regulated the production of siderophores and controlled swimming motility. This is the first report characterizing the direct targets of VirR and provides clear evidence that this LuxR‐type protein can actin vivoas both an activator and repressor of transcription in the absence of its cognate signalling molecule.
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