氨酸-S-化抑制Rop5介导的免疫逃避在Toxoplasma gondii中
S L Lempke1, P C DiMare1, B Nichols2
1Department of Microbiology, Immunology, and Cancer Biology at the Carter Immunology Center, University of Virginia School of Medicine, Charlottesville, Virginia, USA.
bioRxiv : the preprint server for biology
|December 22, 2025
概括
活性物种 (RNS) 通过修改Toxoplasma gondii蛋白质来控制感染. RNS 抑制了 ROP5 毒性因子,促进了 iNOS 缺乏宿主中的寄生虫清除.
科学领域:
- 免疫学 免疫学 免疫学
- 寄生虫学的寄生虫学
- 分子生物学分子生物学
背景情况:
- 反应性物种 (RNS) 对于控制感染至关重要,特别是受细胞内寄生虫Toxoplasma gondii的感染.
- 半氨酸S-化 (SNO) 是一种可逆的翻译后修饰,调节蛋白质功能和细胞信号传递.
研究的目的:
- 调查RNS介导的SNO在Toxoplasma gondii病毒性中的作用.
- 为了确定由SNO以宿主依赖的方式修改的特定T. gondii效应蛋白.
主要方法:
- 鉴定SNO修饰的T. gondii分泌的效应蛋白.
- 在iNOS缺乏的巨细胞和小鼠中评估ROP5功能.
- 对ROP5与寄生虫的真空膜相关性的分析.
主要成果:
- 一组T. gondii分泌的效应蛋白,包括ROP5对应物,被发现以依赖iNOS的方式被SNO修饰.
- 在iNOS缺陷巨细胞中,ROP5对IFN-γ介导的免疫清除对寄生虫逃避至关重要.
- 暴露于RNS导致ROP5脱离寄生虫性真空膜,损害其功能.
- ROP5淘汰寄生虫保护了iNOS缺乏的小鼠免受II型T. gondii感染.
结论:
- 通过修改像ROP5.5这样的效应蛋白,RNS抑制T. gondii的毒性.
- 通过SNO介导的ROP5功能的抑制促进了寄生虫的清除.
- 这种机制突出了控制T. gondii感染的宿主内在途径.
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