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在SARS-CoV-2的分子基础上校对酶介导的对remdesivir的耐药性
Yang Yang1, Yu Li1, Scott T Becker1
1Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011.
概括
SARS-CoV-2 通过使用其校对外核糖酶 (ExoN) 来去除抗病毒药物来抵抗remdesivir. 这种ExoN介导的抗性机制在所有冠状病毒中保留,影响未来的抗病毒开发.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 药物发现 药物发现 药物发现
背景情况:
- 严重急性呼吸道综合征冠状病毒2 (SARS-CoV-2) 对像remdesivir这样的核酸模拟抗病毒药物表现出耐药性.
- 雷梅西维尔通过抑制病毒RNA依赖性RNA聚合酶 (RdRp) 起作用,这对于病毒RNA合成至关重要.
- 这种耐药性对开发有效的SARS-CoV-2疗法构成了重大挑战.
研究的目的:
- 阐明SARS-CoV-2对remdesivir耐药性的基础分子机制.
- 调查病毒外核糖酶 (ExoN) 在雷梅西维尔耐药性中的作用.
- 为了确定冠状病毒中抗病毒耐药性的保存决定因素.
主要方法:
- 生物化学试验用于研究RdRp-RNA复合物的稳定性和RNA结合.
- 酶动力学分析remdesivir被病毒聚合酶和外核酶结合和切除.
- 在不同冠状病毒中对Exon序列和功能的比较分析.
主要成果:
- 雷梅西维尔的结合使RdRp-RNA复合体不稳定.
- 埃克索恩活跃地与病毒RNA链结合并从病毒RNA链中切除雷梅西维尔.
- 在ExoN中保存的残留物对于识别和去除remdesivir至关重要,从而赋予耐药性.
结论:
- 以外核酶为媒介的切除是SARS-CoV-2中remdesivir耐药性的关键机制.
- 保存的ExoN决定因素突出显示了冠状病毒的共同漏洞和目标.
- 这些发现对于设计下一代抗病毒药物和结合疗法来克服耐药性至关重要.
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