在SARS-CoV-2中,S蛋白含有位于反平行β链之间的短环中的furin分裂部位
Arif Bashir1, Shun Li2, Yu Ye3
1Department of Clinical Biochemistry & Biotechnology, Government College for Women, Nawa-Kadal, Srinagar 190002, India.
International journal of biological macromolecules
|October 5, 2024
概括
这种SARS-CoV-2的尖端蛋白质.
科学领域:
- 结构生物学是结构生物学.
- 病毒学 病毒学
- 生物化学 生化学
背景情况:
- 在SARS-CoV-2尖端蛋白的furin分裂部位 (FCS) 对于宿主细胞融合至关重要.
- 野生型的SARS-CoV-2尖端蛋白 (PDB ID: 6yvb) 在FCS中缺乏特定的氨基酸残留物.
- FCS连接了尖端蛋白的S1和S2子单元.
研究的目的:
- 描述FCS在SARS-CoV-2中的结构性作用.
- 为了研究FCS突变对尖端蛋白结构的影响.
- 探索尖端蛋白内潜在的治疗点.
主要方法:
- 对SARS-CoV-2尖端蛋白结构的分析 (PDB ID: 6yvb).
- 在野生型和B.1.1.7变体之间的S1/S2交叉点上的二级结构元素 (β-sheet和loops) 的比较.
- 具有潜在联体的SARS-CoV-2受体结合域 (RBD) 的分子动力学模拟.
主要成果:
- 一个14氨基酸延伸 (677QTNSPRRARSVASQ689) 形成一个含有FCS的PRRAR序列的反平行β片.
- 由于HRRAR序列,B.1.1.7变异体现出减少的反平行β片含量和增加的FCS循环含量.
- 包括受体结合基因 (RBM) 在内的RBD使用β6和相邻的循环来结合连接体.
结论:
- FCS 形成一个 β-sheet 结构,可以与 TMPRSS2 和 α1AT.等蛋白酶相互作用.
- 像B.1.1.7这样的变体的FCS循环中的结构变化可能会影响病毒的进入.
- RBD与β6和循环的相互作用表明了针对这些区域进行SARS-CoV-2感染治疗的潜在治疗策略.
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