C-di-AMP的积累扰乱了谷氨代谢,并抑制了Listeria monocytogenes中的病毒性程序表达
bioRxiv : the preprint server for biology
|January 31, 2024
概括
细菌中高水平的循环二-AMP (c-di-AMP) 通过耗尽谷氨 (GSH) 来降低毒性. 这项研究揭示了c-di-AMP.
科学领域:
- 细菌病原发生的细菌.
- 分子微生物学分子微生物学
- 第二个信使信号发送.
背景情况:
- 循环二-AMP (c-di-AMP) 是一种重要的细菌第二信使,但其失调可以减轻毒性.
- 了解c-di-AMP积累如何影响细菌病原是开发新型抗菌策略的关键.
- 李斯特菌的毒性主要由转录因子PrfA控制,该转录因子由减少的谷氨 (GSH) 激活.
研究的目的:
- 阐明c-di-AMP积累减少Listeria monocytogenes中的细菌毒性机制.
- 确定c-di-AMP调节的途径,这些途径对宿主适应和复制至关重要.
- 探索c-di-AMP恒温与谷氨代谢之间的联系.
主要方法:
- 在Listeria monocytogenes中对c-di-AMP化酶缺乏突变体 (ΔPDE) 的转录组分析.
- 对毒性基因和PrfA活动的定量基因表达分析.
- 量化GSH,吸收试验,以及GSH合成和代谢的分析.
主要成果:
- 具有高c-di-AMP水平的ΔPDE突变体显示PrfA调节的毒性基因表达显著受损.
- c-di-AMP 的积累导致了 ΔPDE 菌株的 GSH 耗尽,抑制了 GSH 的吸收.
- 虽然一个构成性活跃的PrfA变体部分恢复了毒性,但c-di-AMP对GSH代谢的影响被确定为一个关键的毒性缺陷.
结论:
- 在Listeria monocytogenes中积累的c-di-AMP会破坏谷氨代谢,导致GSH耗尽.
- 这种GSH枯竭会损害必不可少的毒性基因的表达,从而减弱细菌病原性.
- 针对c-di-AMP介导的GSH代谢调节,可以作为对抗细菌感染的潜在治疗策略.
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