重新定义在SARS-CoV-2中的NSP12活动及其通过NSP8和NSP7的调节
Deepa Singh1, Tushar Kushwaha1, Rajkumar Kulandaisamy1
1Department of Biophysics, All India Institute of Medical Sciences, New Delhi, Delhi 110029, India.
Molecular therapy. Nucleic acids
|February 13, 2025
概括
对于冠状病毒复制至关重要的RNA-依赖RNA聚合酶 (RdRp) 全酶,需要NSP12,NSP7和NSP8之间的特定相互作用. 这些蛋白质一起增强聚合酶活性,但单独的辅因子抑制功能,提供药物开发目标.
科学领域:
- 病毒学 病毒学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 依赖RNA的RNA聚合酶 (RdRp) 对于RNA病毒 (包括冠状病毒) 的生命周期至关重要.
- SARS-CoV-2 RdRp全酶包括NSP12,NSP7和NSP8,但其精确的相互作用及其对RNA合成的影响尚未完全理解.
研究的目的:
- 为了复制和表征SARS-CoV-2 RdRp全酶.
- 研究NSP12,NSP7和NSP8之间的分子相互作用及其对聚合酶活性和RNA结合的影响.
主要方法:
- 在体外使用复合SARS-CoV-2NSP12,NSP7和NSP8的功能性RdRp全酶的复制.
- 测试用于测量聚合酶活性和RNA结合.
- 用单个辅助因子对NSP12复合物的计算分析.
主要成果:
- 单独NSP12表现出聚合酶活性,这种活性因NSP7和NSP8.8的存在而显著增强.
- 单独存在NSP7或NSP8就会抑制NSP12的活性,并导致RNA模板脱离.
- 计算建模表明,单独的NSP7或NSP8结合缩小了NSP12的RNA入口通道,阻碍了RNA结合.
结论:
- NSP7和NSP8协同作用,增强NSP12聚合酶活性,但单独存在时对其功能产生对抗作用.
- 针对NSP7/NSP8和NSP12之间的相互作用可能是开发新型抗病毒药物的可行策略.
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