重塑抗体多样性的重塑
Feng Wang1, Damian C Ekiert, Insha Ahmad
1Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA.
Cell
|June 11, 2013
概括
奶牛拥有独特的抗体,具有超长的CDR H3循环,形成二硫化物结合的小域. 这种由体质突变产生的结构多样性增强了牛的抗体库和抗原识别.
科学领域:
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
- 分子生物学分子生物学
背景情况:
- 尽管遗传多样性有限,但一些物种表现出强烈的抗体反应.
- 牛 (Bos taurus) 具有独特的抗体系统,其特点是长CDR H3循环和少数V区域,具有未知的多样性生成机制.
研究的目的:
- 研究在牛群中产生抗体多样性的背后的机制,重点关注其CDR H3循环的独特特征.
- 阐明牛抗体中超长CDR H3s的结构基础和功能影响.
主要方法:
- 牛抗体库的深度测序 牛抗体库的深度测序
- 确定牛抗体的晶体结构.
- 对体质高突变模式和子偏差的分析.
主要成果:
- 牛抗体中的超长CDR H3循环含有众多的囊蛋白,这表明二硫化物结合小域的形成.
- 晶体结构揭示了一个具有β链"茎"的架构,支持多样化,二硫化物结合的"旋"域.
- 超长DH段的体质超变异,偏向氨酸,驱动多样性生成.
结论:
- 牛的免疫系统通过超长的CDR H3产生抗体多样性,这些CDR H3通过体质生成的二硫化物折叠成小域.
- 这些独特的抗体结构,特别是旋域,可以引起识别特定的抗原.
- 与其他物种相比,牛类抗体具有独特的结构和产生多样性的机制.
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