对帕尔沃病毒感染的有限自然多克隆抗体反应的结构和功能
Oluwafemi F Adu1, Hyunwook Lee2, Simon P Früh1,3
1Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853.
概括
狗类帕沃病毒感染会引起一个集中的抗体反应. 关键抗体向病毒囊表位,阻断宿主受体结合,并提供对感染的保护.
科学领域:
- 病毒学 病毒学
- 免疫学 免疫学 免疫学
- 结构生物学 结构生物学
背景情况:
- 主体抗体反应对于病原体保护至关重要,但病毒抗原和B细胞诱导导致多种保护的特性仍然不清楚.
- 帕沃病毒具有简单的状结构,具有重复的动机,引起强烈的,保护性的抗体反应.
- 之前的研究表明,在犬类帕维病毒感染后,主导抗体的数量有限.
研究的目的:
- 为了描述犬类帕尔沃病毒感染后产生的关键抗体.
- 确定这些抗体的结合性质和中和效率.
- 了解这些抗体如何与病毒表位和宿主受体相互作用.
主要方法:
- 主导抗体的测序. 主导抗体的测序.
- 低温电子显微镜 (cryo-EM) 用于在头皮上绘制表位图.
- 在体外测试以评估病毒感染性和抗体 (IgG和Fabs) 的中和.
主要成果:
- 两个占主导地位的抗体,共享重链,结合了囊体的B位;第三个抗体结合了A位.
- 抗体表位在不同程度上与犬类转移素受体1型结合部位重叠.
- 抗体中和效率与它们阻断受体结合的能力相关,观察到显著的变化.
结论:
- 狗类帕尔沃病毒免疫反应高度集中,产生针对关键囊表位的特定抗体.
- 这些特征性单克隆抗体验证了多克隆血清分析的发现.
- 聚焦的抗体反应通过干扰宿主受体相互作用,有效地中和病毒,提供保护.
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