一个白痴类-反白痴类复合体的三维结构
G A Bentley1, G Boulot, M M Riottot
1Unité d'Immunologie Structurale, URA 359 CNRS, Département d'Immunologie, Institut Pasteur, Paris, France.
Nature
|November 15, 1990
概括
异型-反异型相互作用是免疫系统调节的关键. 这项研究揭示了对抗原体复合物的结构性见解,显示了抗原体和抗原结合部位之间的显著重叠.
科学领域:
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 瓜是抗体上独特的抗原决定因素,形成型.
- 免疫系统可能通过异型-反异型网络自我调节.
- 反型可以模仿外部抗原,潜在地作为内部图像.
研究的目的:
- 阐明异型-反异型相互作用的结构基础.
- 为了研究抗原型的分子模仿潜力.
- 描述一个白痴和相应的抗原组合部位之间的结构重叠.
主要方法:
- 采用X射线晶体学,确定了与抗异构物FabE225.25复合的抗lyszyme抗体FabD1.3 Fab片段的结构.
- 高分辨率结构分析在2.5A.
主要成果:
- 确定了FabD1.3-FabE225复合物的结构.
- 定义了一个私人白痴,包括13个氨基酸残留物,主要来自FabD1.3的互补性决定区域.
- 其中七种白痴残留物直接与抗原 (lyszyme) 相互作用,表明与抗原组合部位有很大的重叠.
结论:
- 这项研究提供了一个高分辨率的结构的反-idiotope-idiotype复合体.
- 抗体的白内障和其抗原结合部位之间存在显著的结构重叠.
- 在这种特定情况下,在结构层面上没有观察到白痴对外部抗原的分子模仿.
相关概念视频
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