The two-component system CpxA/CpxR is critical for full virulence in Actinobacillus pleuropneumoniae.

The two-component system CpxA/CpxR is critical for full virulence in Actinobacillus pleuropneumoniae.
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DOI:
10.3389/fmicb.2022.1029426
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发表时间:
2022
影响因子:
5.2
通讯作者:
Lei, Liancheng
Lei, Liancheng
中科院分区:
生物学2区
文献类型:
--
作者:
Liu, Feng;Yao, Qing;Huang, Jing;Wan, Jiajia;Xie, Tingting;Gao, Xuejun;Sun, Diangang;Zhang, Fuxian;Bei, Weicheng;Lei, Liancheng

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胸膜肺炎放线杆菌是引起猪胸膜肺炎的一种主要的猪呼吸道细菌病原体,在世界范围内造成了巨大的经济损失。双组分系统CpxAR突变强烈影响胸膜肺炎假单胞菌的毒力,但其潜在的调控机制尚不清楚。本研究发现,CpxAR正调控参与多糖胶囊输出的cpxDCBA基因簇。通过透射电镜观察发现,野生型细胞存在荚膜层,而cpxAR和cpxD突变体细胞无荚膜层。多糖胶囊输出基因cpxD突变体表现为无胶囊化,对小鼠毒力严重受损,表明CPS输出系统在毒力中起主要作用。然后我们证明CpxR直接调控CPS输出基因簇cpxDCBA的转录。综上所述,我们的数据表明,CpxAR是促进胸膜肺炎假体在宿主体内存活的胶囊出口的关键调节剂。
Actinobacillus pleuropneumoniae, a major bacterial porcine respiratory tract pathogen causing pig pleuropneumonia, has resulted in high economic losses worldwide. The mutation of the two-component system CpxAR strongly impacted the virulence of A. pleuropneumoniae, but the underlying regulatory mechanism remained unclear. Here, we found that CpxAR positively regulated the cpxDCBA gene cluster involved in polysaccharide capsule export. A capsular layer was confirmed in wild-type cells by transmission electron microscopy, whereas cpxAR and cpxD mutants were non-capsulated. The mutants for polysaccharide capsule export gene cpxD exhibited non-capsulated and were strongly impaired in virulence for mice, indicating a major role of CPS export system in virulence. We then demonstrated that CpxR directly regulated the transcription of the CPS export gene cluster cpxDCBA. Taken together, our data suggested that CpxAR is a key modulator of capsule export that facilitates A. pleuropneumoniae survival in the host.
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