在ENSITRELVIR结合和SARS-CoV-2主要蛋白质酶的短暂二元化过程中可视化活性位点氧化离子环过渡
Andrey Kovalevsky1, Annie Aniana2, Leighton Coates3
1Neutron Scattering Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, TN, 37831, USA.
Journal of molecular biology
|May 18, 2024
概括
在SARS-CoV-2主要蛋白酶 (MPro) 需要N-终端二分化活动. 恩西特里尔维尔 (ESV) 结合揭示了二分化关键残留物,并捕获了活性部位.
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:
- SARS-CoV-2 主蛋白酶 (MPro) 经历N端自处理,形成稳定的二聚体,这对其催化活性至关重要.
- 活性位点的氧化离子环平衡过渡到与二元化并发的活性构造 (E*).
研究的目的:
- 为了研究N-终端残留在SARS-CoV-2MPro二分化中的作用.
- 描述非对应性抑制剂恩瑞尔维尔 (ESV) 的结合及其对MPro构成和二分化的影响.
- 为了阐明MPro激活和抑制期间的氧化离子环的结构转换.
主要方法:
- 在MPro.中关键接口残留物的位点定向突变发生.
- 使用生物物理技术评估非共价抑制剂 (恩西特里尔维尔,ESV) 的结合及其对MPro二分化的影响.
- 室温X射线晶体学以鉴定MPro抑制剂复合物的特征.
主要成果:
- 从Ser1到Glu14的残留物对MPro二分化至关重要.
- 组合突变G11A,E290A和R298A (MProTM) 显著限制二分化,即使与ESV结合.
- 结合单体MProTM的ESV捕获了独立于二元化的氧离子环形状转换 (E*到E),揭示了涉及残留物G138-F140.0的初始转移.
- 观察到MPro前体的短暂二元结构,这表明它是一种自动处理的中间体.
结论:
- N-终端残留物在SARS-CoV-2的MPro二分化和随后的激活中起着至关重要的作用.
- 非共价抑制剂ESV可以与单体MPro结合,从而提供对结构动态和潜在治疗策略的见解.
- 结构性表征揭示了MPro自动处理和激活通路中的关键中间体.
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