与SARS相关的冠状病毒S蛋白结构揭示了协同RBM相互作用,这是高亲和度人类ACE2结合的基础
Jingjing Wang1, Yong Ma1, Zimu Li1,2,3
1Guangdong Provincial Key Laboratory of Stem Cell and Regenerative Medicine, Guangdong-Hong Kong Joint Research Laboratory for Stem Cell and Regenerative Medicine, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.
Science advances
|March 14, 2025
概括
与严重急性呼吸系统综合征冠状病毒 (SARS) 相关的冠状病毒 (SARSr-CoVs) 与人类血管素转化酶2 (hACE2) 结合,通过新的冷EM结构来澄清. 这些发现揭示了SARSr-CoV尖端蛋白如何通过特定突变获得高亲和度的 hACE2结合.
科学领域:
- 结构生物学是结构生物学.
- 病毒学 病毒学
- 病毒进入的分子机制.
背景情况:
- 严重急性呼吸系统综合征冠状病毒 (SARS) 相关的冠状病毒 (SARSr-CoVs) 与人类血管素转化酶2 (hACE2) 受体的结合对于病毒的进入至关重要,但尚未完全理解.
- SARSr-CoVs利用它们的尖峰 (S) 蛋白来调解这种相互作用,在不同病毒菌株中观察到结合亲和力和特异性的变化.
研究的目的:
- 阐明各种SARSr-CoVs对 hACE2受体识别的结构基础.
- 了解使SARSr-CoV S蛋白能够实现与HACE2高亲和度结合的分子决定因素.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 确定了八种不同的SARSr-CoV S-蛋白的结构.
- 在特定的S蛋白区域,特别是受体结合基因 (RBM) 上进行了结构引导的突变发生,以评估对ACE2结合的影响.
主要成果:
- 冷-EM结构显示,SARSr-CoV S-蛋白采用锁定,预注射形状,允许根据RBM结构和ACE2结合分类为三种类型.
- 类型-2 S 蛋白与蝙蝠 ACE2 (bACE2) 相比,对 hACE2 的结合更为优越. 确定了与bACE2复合的2型BtKY72-RBD的结构.
- 突变性研究表明,四个不同的RBM区域内的多个协同突变对于高亲和度的HACE2结合是必要的,这些变化可以使HACE2结合到以前不结合的S蛋白.
结论:
- 该研究提供了有关SARSr-CoV S-蛋白与ACE2受体相互作用的详细结构见解.
- 了解通过特定的RBM突变获得高亲密度的haCE2结合对于预测病毒热带性和开发针对SARSr-CoVs的治疗策略至关重要.
相关概念视频
Conjugated Proteins
18.2K
Simple proteins and protein complexes contain only amino acids. In contrast, many other proteins, called conjugated proteins, covalently bond with non-protein moieties.
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
Nucleoproteins are protein complexes that contain nucleic acids, categorized as deoxyribonucleoproteins (DNPs) or ribonucleoproteins (RNPs) respectively. The nucleosome is a typical example of a DNP where nuclear DNA is associated with histone proteins. The major antigen for the Covid-19 virus SARS-CoV is an RNP that is critical...
18.2K
Rab Proteins
3.8K
Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
3.8K
Assembly of Signaling Complexes
5.7K
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
5.7K
Rous Sarcoma Virus (RSV) and Cancer
4.9K
Rous Sarcoma virus or RSV was discovered by F. Peyton Rous in the year 1911 as a filterable transmissible agent that could cause tumors in chickens. He won a Nobel Prize for this discovery in 1966. His experiments clearly demonstrated that some cancers could be caused by infectious agents and led to the discovery of many more cancer-causing viruses in animals as well as humans.
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
RSV is a retrovirus that contains two copies of a plus-strand RNA genome. Its genome consists of four main open...
4.9K


