广泛中和抗体8ANC195识别了HIV-1 Env的封闭状态和开放状态
Louise Scharf1, Haoqing Wang1, Han Gao1
1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA.
针对HIV-1的广泛中和抗体 (bNAbs) 是罕见的. 8ANC195抗体在HIV-1 Env子单元中结合一个独特的表位,由于其能够参与多个Env构造,因此具有潜在的治疗优势.
科学领域:
- 结构生物学
- 免疫学
- 病毒学
背景情况:
- 艾滋病毒-1包裹 (Env) 尖峰限制了广泛中和抗体 (bNAb) 表位,导致株特异的中和抗体.
- 8ANC195 bNAb针对的是HIV-1 Env尖端的gp120和gp41子单元的表位.
研究的目的:
- 为了阐明Env调整器中的8ANC195表位的高分辨率结构.
- 研究8ANC195与不同Env构造的相互作用,包括CD4结合状态.
主要方法:
- 8ANC195的X射线结晶学复合物与一个完全糖化Env的三元体.
- 对Env/CD4/CD4诱导的抗体/8ANC195复合物的冷电子显微镜 (冷EM).
主要成果:
- 一个3.58 Å的晶体结构显示8ANC195结合在一个甘氨酸盾隙,接触gp120和gp41甘氨酸和蛋白质残留物.
- EM结构显示8ANC195结合诱导了CD4结合的Env三元体的部分关闭,揭示了新的构造.
- 这表明了Env尖端的结构可塑性.
结论:
- 8ANC195在糖屏蔽间隙内可获得,并与Env蛋白和糖残留物相互作用.
- 8ANC195可以结合并调节不同的Env构造,包括以前未观察到的状态.
- 8ANC195能够结合多种Env形状,这表明它具有针对HIV-1的治疗应用的巨大潜力.
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