尖端蛋白对血管酶转化酶2 (ACE2) 的影响
Jennyfer Bejoy1, Charlye I Williams1, Hattie J Cole1
1Department of Pharmacology and Physiology, Georgetown University Medical Center, Washington DC, 20007, USA.
Archives of biochemistry and biophysics
|September 28, 2023
概括
与其他冠状病毒不同的是,SARS-CoV-2尖端蛋白增强了 ангиотензин转化酶2 (ACE2) 酶活性. 这种增强是由尖蛋白增强的.
科学领域:
- 病毒学 病毒学
- 生物化学 生化学
- 分子生物学分子生物学
背景情况:
- COVID-19大流行是由SARS-CoV-2引起的,该病毒利用其尖端蛋白质在宿主细胞上与ACE2结合.
- ACE2是一种降解 ангиотензин II 的酶,它是血压调节和疾病病理学的关键分子.
- SARS-CoV-2尖端蛋白与ACE2之间的相互作用对于病毒进入至关重要,并且可能会影响ACE2的功能.
研究的目的:
- 调查冠状病毒尖端蛋白与ACE2的结合是否会影响其酶性化酶活性.
- 为了确定尖端蛋白的哪些域负责ACE2结合和潜在活性调节.
- 探索尖端蛋白质糖化和氨酸氧化在ACE2相互作用和活性中的作用.
主要方法:
- 使用各种冠状病毒 (SARS-CoV-2,SARS-CoV,MERS-CoV,HKU1) 的尖端蛋白质表达在不同的系统 (HEK293细胞,大肠杆菌) 中进行了尖端/ACE2结合试验.
- 对尖端蛋白 (S1,S2,RBD,ECD,CendR) 的特定域进行了ACE2结合分析.
- 在不同尖端蛋白及其域的存在下测量了ACE2酶活性.
- 评估了蛋白质糖化和氨酸氧化对ACE2结合和活性的影响.
主要成果:
- 来自SARS-CoV-2,SARS-CoV和MERS-CoV的尖端蛋白与ACE2结合,主要通过S1和RBD域.
- 在HEK293细胞中表达的蛋白质 (糖化,氧化半氨酸) 显示出ACE2结合,与大肠杆菌 (非糖化,减少半氨酸) 的蛋白质不同.
- SARS-CoV-2 S1 蛋白,特别是它的 RBD,显著增强了 ACE2 酶活性,这种效应独立于糖化.
- 来自所有测试系统的尖端蛋白质增强了ACE2活性,尽管结合能力不同.
结论:
- 通过其受体结合域 (RBD),SARS-CoV-2的尖端蛋白增强了ACE2酶活性.
- 这种由SARS-CoV-2尖端蛋白增强ACE2活性是独立于糖化.
- 与其他研究的冠状病毒不同,SARS-CoV-2尖端蛋白调节ACE2功能,这表明它在COVID-19病变发生过程中发挥着独特的作用.
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