抗原模仿的分子基础由一个反-基因组的抗原模仿
B A Fields1, F A Goldbaum, X Ysern
1Center for Advanced Research in Biotechnology, University of Maryland Biotechnology Institute, Rockville 20850, USA.
Nature
|April 20, 1995
概括
抗体可以在分子水平上模仿抗原. 反酶抗体E5.2在结构上模仿了酶.
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:
- 异构体是抗体的独特决定因素,形成异构型.
- 反型抗体可以模仿外部抗原,携带"内部图像".
- 以前的研究缺乏这种模仿的明确结构证据.
研究的目的:
- 通过抗异型抗体来研究抗原的分子模拟.
- 为了确定白痴与反白痴相互作用的结构基础.
- 通过免疫原性来验证功能模仿.
主要方法:
- 一个idiotope-anti-idiotope复合物的X射线晶体学 (D1.3和E5.2的Fv片段).
- 对结合部位残留物相互作用的分析.
- 用抗异型抗体E5.2.2.进行免疫.
主要成果:
- 反酶抗体D1.3通过类似的结合点残留物结合酶和抗D1.3抗体E5.2.
- E5.2通过模仿lyszyme的接触方式与D1.3相互作用.
- 当用作免疫原体时,E5.2会诱导抗lyszyme免疫反应.
结论:
- 抗异型抗体E5.2在结构上模仿了lyszyme在其结合相互作用中的作用.
- 这种结构模仿支持"内部图像"抗体的概念.
- 反型抗体可以引起针对原始抗原的特定免疫反应.
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