在ACE2的活性部位的结构变化对SARS-CoV-2尖蛋白受体结合域的结合作用
Natalia V Dolgova1, Muhammad Qureshi2, Matthew Latimer2
1Calibr─California Institute for Biomedical Research, Scripps Research, 11119 North Torrey Pines Road, La Jolla, California 92037, United States.
Inorganic chemistry
|February 18, 2025
概括
血管酶转化酶2 (ACE2) 的二元形式,包括蛋白酶和子域,是研究SARS-CoV-2尖端蛋白相互作用的更好的模型. 这种二极体ACE2表现出异性,与之前研究的单体形式不同.
科学领域:
- 生物化学 生化学
- 结构生物学 结构生物学
- 病毒学 病毒学
背景情况:
- 严重急性呼吸系统综合征冠状病毒2 (SARS-CoV-2) 使用其尖端蛋白来结合血管酶转化酶2 (ACE2) 进入细胞.
- ACE2是一种碳氧酶,具有蛋白酶,部和跨膜域,也充当B0AT1.1的陪伴者.
- 之前的研究通常集中在单体ACE2蛋白酶域上,可能忽视其活性位点和二维形式的功能意义.
研究的目的:
- 研究ACE2的单体和二极体形式之间的结构和功能差异,特别是关于其活性位点和全性质的特性.
- 评估Zn2+含有活性位点在ACE2功能中的作用及其与SARS-CoV-2尖端受体结合域 (RBD) 的相互作用.
- 确定ACE2的二次形式是否为研究病毒与宿主相互作用提供了更准确的模型.
主要方法:
- 生物化学测试以评估单体和二元ACE2的催化活性和性.
- 射线吸收光谱 (XAS) 来探测ACE2中的Zn2+活性部位环境.
- 结构分析比较单独的蛋白酶域与包括子域在内的ACE2.
主要成果:
- 双体ACE2 (蛋白酶和子域) 显示其催化活性的全调节,这种调节在单体蛋白酶域中不存在.
- 将SARS-CoV-2尖峰RBD与二度ACE2结合起来,可以消除其全性.
- 在尖端RBD结合时,XAS揭示了二度ACE2的Zn2+活性位点的明显变化,表明灵活性和协调改变.
结论:
- ACE2的Zn2+活性位是灵活的,其特性通过二分化和尖端RBD结合来调节.
- 模态ACE2,包括蛋白酶和子领域,代表了比单体形式更具生物学相关性的模型来研究SARS-CoV-2相互作用.
- 了解二度ACE2的全调节和活性位点动态对于开发有效的抗病毒策略至关重要.
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