识别IL-33的结构基础及其与虫效应蛋白HpARI2的对抗
Abhishek Jamwal1,2, Florent Colomb3, Henry J McSorley4
1Department of Biochemistry, University of Oxford, South Parks Road, Oxford, OX1 3QU, UK.
Nature communications
|June 18, 2024
概括
寄生虫蛋白HpARI2通过阻断其受体ST2.2来抑制免疫信号IL-33. 这种结构洞察力揭示了虫如何抑制宿主免疫力和喘,提供了新的治疗点.
科学领域:
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
- 寄生虫学的寄生虫学
背景情况:
- 介素-33 (IL-33) 对于对寄生虫的免疫反应以及喘等过敏性疾病至关重要.
- 线虫Heligmosomoides polygyrus bakeri分泌HpARI2,一种效应蛋白,通过抑制IL-33信号传递来抑制宿主免疫力.
研究的目的:
- 阐明HpARI2与小鼠IL-33.3相互作用的结构基础.
- 了解HpARI2抑制IL-33介导免疫反应的机制.
主要方法:
- 进行X射线晶体学以确定与IL-33结合的HpARI2的结构.
- 基于细胞的测试来评估IL-33信号抑制.
- 在体内小鼠喘模型评估HpARI的功能影响2.
主要成果:
- 该结构显示HpARI2通过其CCP2和CCP3域结合IL-33,CCP3的关键循环直接与IL-33ST2受体结合部位相互作用.
- 缺少这种循环的截断HpARI2未能在体外和体内抑制IL-33信号传递.
- HpARI2直接与IL-33受体ST2竞争,防止信号复合体的形成.
结论:
- 这项研究揭示了HpARI2抑制IL-33的分子机制,突出了与ST2.2的直接竞争.
- 这种结构性理解为寄生虫虫使用的免疫逃避策略提供了洞察力.
- 这些发现表明,在炎症和过敏性疾病中,针对IL-33/ST2通路的潜在治疗策略.
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