替代性自我组装途径的结构基础,导致不同的人类免疫缺陷病毒囊状纳米粒子
Judith Escrig1, Íñigo Marcos-Alcalde2, Santos Domínguez-Zotes1
1Virus Engineering Group, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Campus of the Universidad Autónoma de Madrid, Madrid 28049, Spain.
ACS nano
|September 27, 2024
概括
研究人员修改了人类免疫缺陷病毒 (HIV-1) 囊蛋白,以创建形纳米粒子. 破坏一个关键的中间组件的稳定性,二元体的三元体,促进了所需的体结构的形成,而不是管道.
科学领域:
- 生物物理学的生物物理.
- 结构生物学 结构生物学
- 纳米技术纳米技术
背景情况:
- 病毒粒子组装机制激发了自组装蛋白质纳米结构的设计.
- 人类免疫缺陷病毒1型 (HIV-1) 囊蛋白 (CA) 是研究纳米粒子组装的一个模型.
- 在体外实现特定的纳米粒子架构,如形HIV-1体,仍然具有挑战性,往往导致异常的管状结构.
研究的目的:
- 研究特定蛋白质纳米粒子架构在体外自我组装的分子决定因素.
- 了解为什么HIV-1 CA通常形成管,而不是所需的形囊结构.
- 确定将HIV-1 CA组装定向到真实的状纳米颗粒的策略.
主要方法:
- 利用CA-CA接口的特定氨基酸替代物来改变蛋白质相互作用.
- 使用全原子分子动力学 (MD) 模拟来分析组装中间体的稳定性.
- 比较野生型 (wt) CA和突变变异的in vitro组装结果.
主要成果:
- 某些氨基酸替代有利于组装形纳米颗粒,类似于真实的HIV-1囊.
- 全原子MD模拟显示,CA二聚体 (ToD) 中介的三聚体在突变物中不稳定,形成形粒子.
- ToD 不稳定与 CA-CA 接口的结构变化有关,减少了蛋白间相互作用.
结论:
- 降低ToD中间体的稳定性促进了形HIV-1囊状纳米粒子在体外形成.
- ToD中间体的不稳定性促进了CA体的结合,这对于形至关重要.
- 这项研究提供了一个模型,通过调整关键中间体的稳定性来控制蛋白质纳米粒子组装.
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