与IL-33结合的临床抗体结构揭示了两种不同的表位,这些表位是差异性疗效的基础
Jing Chen1,2,3,4, Yue Wang1,2,3, Xinquan Wang1,2,3
1The Ministry of Education Key Laboratory of Protein Science, Tsinghua University, Beijing, China.
mAbs
|March 1, 2026
概括
三种针对介素-33 (IL-33) 的抗体显示出不同的结构机制来中和炎症反应. 了解这些表位为开发喘等疾病的新疗法提供了洞察力.
科学领域:
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
背景情况:
- 介素-33 (IL-33) 是2型炎症的关键驱动因素,与喘和COPD有关.
- 目前的疗法针对IL-33或其受体ST2,但中和的结构机制尚不清楚.
研究的目的:
- 阐明三种临床阶段的抗IL-33抗体中和的结构基础:埃托基马布,伊特佩基马布和托佐拉基马布.
- 了解这些抗体如何抑制IL-33/ST2相互作用.
主要方法:
- 使用X射线结晶学和冷电子显微镜来确定与三种抗体复合的IL-33的结构.
- 进行了生物化学测试,以评估抗体结合的功能影响.
主要成果:
- 确定了IL-33上两个不同的中和表位:表位1 (在IL-33/ST2结合部位1) 和表位2 (在IL-33/ST2结合部位2).
- 托佐拉基马布 (Epitope 1) 完全阻止了ST2结合,通过硬质阻碍ST2 D1-D2域界面.
- 埃托基马布和伊特佩基马布 (Epitope 2) 通过干扰ST2 D3域识别来部分抑制ST2结合.
结论:
- 结构和生物化学数据解释了抗体在抑制IL-33信号传递方面的差异性疗效.
- 这些发现提供了对IL-33治疗疗效的分子决定因素的见解.
- 为设计下一代IL-33抑制剂提供了一个结构框架.
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