Evidence for a role of the polysaccharide capsule transport proteins in pertussis pathogenesis.

Evidence for a role of the polysaccharide capsule transport proteins in pertussis pathogenesis.
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DOI:
10.1371/journal.pone.0115243
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Alonso S
Alonso S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Hoo R;Lam JH;Huot L;Pant A;Li R;Hot D;Alonso S

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多糖(PS)被膜是许多细菌病原体的重要毒力决定因素。百日咳博德特氏菌是百日咳的病原体,它产生一种表面结合的微囊,但它在百日咳发病机制中的作用仍然未知。这里我们展示了B。百日咳荚膜基因座在鼠肺中体内表达,并且参与PS聚合物穿过包膜转运的膜相关蛋白KpsT的缺失,而不是表面暴露的PS荚膜本身,显著影响B。小鼠中百日咳定殖效力。基因芯片分析显示B细胞中KpsT基因缺失。百日咳导致基因表达的整体下调,包括由BvgA/S(主要双组分系统)调节的关键毒力基因。使用BvgS锁相突变体,我们证明了KpsT和BvgA/S介导的信号转导之间的功能联系。而下拉测定不支持BvgS传感器和任何胶囊基因座编码的蛋白质之间的物理相互作用,KpsT的缺乏损害BvgS寡聚化,BvgS功能所必需的。此外,互补研究表明,而不是单独的KpsT,整个PS胶囊运输机制跨越细胞包膜可能发挥作用的BvgS介导的信号转导。因此,我们的工作提供了第一个实验证据,在百日咳发病机制的毒力抑制基因的作用。
Polysaccharide (PS) capsules are important virulence determinants for many bacterial pathogens. Bordetella pertussis, the agent of whooping cough, produces a surface associated microcapsule but its role in pertussis pathogenesis remained unknown. Here we showed that the B. pertussis capsule locus is expressed in vivo in murine lungs and that absence of the membrane-associated protein KpsT, involved in the transport of the PS polymers across the envelope, but not the surface-exposed PS capsule itself, affects drastically B. pertussis colonization efficacy in mice. Microarray analysis revealed that absence of KpsT in B. pertussis resulted in global down-regulation of gene expression including key virulence genes regulated by BvgA/S, the master two-component system. Using a BvgS phase-locked mutant, we demonstrated a functional link between KpsT and BvgA/S-mediated signal transduction. Whereas pull-down assays do not support physical interaction between BvgS sensor and any of the capsule locus encoded proteins, absence of KpsT impaired BvgS oligomerization, necessary for BvgS function. Furthermore, complementation studies indicated that instead of KpsT alone, the entire PS capsule transport machinery spanning the cell envelope likely plays a role in BvgS-mediated signal transduction. Our work thus provides the first experimental evidence of a role for a virulence-repressed gene in pertussis pathogenesis.
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