鉴定Pasteurella multocida中的双组分系统ArcAB和通用应激蛋白E及其对细菌适应性和病变发生的影响
Qingjie Lv1, Yuyao Shang1, Haixin Bi1
1National Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.
Microbes and infection
|October 6, 2023
概括
在ArcAB的两部分系统 (TCS) 调节Pasteurella multocida的毒性和适应性. 删除ArcAB或其目标uspE会损害厌氧生长,生物膜形成和宿主防御,揭示关键的致病机制.
科学领域:
- 细菌病原体的产生
- 分子微生物学 分子微生物学
- 信号传输 信号传输
背景情况:
- 两组件系统 (TCS) 对于细菌的适应性和毒性至关重要.
- 帕斯托雷拉多cida是一种重要的动物传染病原体,TCS研究有限.
- 目前正在研究ArcAB TCS对P. multocida.中的作用.
研究的目的:
- 为了阐明ArcAB TCS在Pasteurella multocida中的功能.
- 为了确定ArcAB的下游目标.
- 了解ArcAB对P. multocida病原体的贡献.
主要方法:
- 对ArcAB同类的全基因组识别.
- 在不同的环境条件下进行基因转录分析.
- 构造和P. multocida arcA删除突变体 (ΔarcA) 的表型分析.
- RNA测序 (RNA-Seq) 用于识别 ΔarcA.中的差异表达基因.
- 电泳运动转移测定 (EMSA) 证实直接目标调节.
- 构建和分析uspE删除突变体.
主要成果:
- 在不同血清组的P. multocida中存在ArcAB同类.
- 在无氧和超氧环境中,arcA和arcB转录被上调.
- ΔarcA突变体在体内表现出降低的无氧生长,生物膜形成,血清耐药性,粘附性,入侵性,抗细胞化和毒性.
- RNA-Seq在DarcA中发现了70个下调的基因,包括新的目标 uspE.
- 通过EMSA,ArcAB直接调节了uspE的转录.
- 删除 uspE 副本 ΔarcA,影响生长,生物膜,宿主防御和毒性.
结论:
- 该ArcAB TCS对于Pasteurella multocida的适应性和发病过程至关重要.
- ArcAB调节关键的毒性因素,包括uspE,有助于细菌的生存和宿主感染.
- 了解ArcAB-uspE监管轴可以了解P. multocida的毒性机制.
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