伪乌里丁残留物作为血清核糖酶的基质
Clair S Gutierrez1, Bjarne Silkenath1, Volga Kojasoy1
1Massachusetts Institute of Technology.
概括
在信使RNA (mRNA) 中,修改后的核酸伪尿素 (Ψ) 和N1-甲基伪尿素 (m1Ψ) 比未修改后的尿素 (U) 更能抵抗RNase A和RNase 1的酶分裂. 这种稳定性对于RNA疫苗开发至关重要.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- RNA的临床应用需要在血清中保持稳定性,血清中含有像RNase 1这样的核糖核酶 (RNases).
- 伪氨基酸 (Ψ) 和N1-甲基伪氨基酸 (m1Ψ) 是修改后的核酸,可降低mRNA免疫性并增强翻译能力,因此对RNA疫苗至关重要.
研究的目的:
- 调查伪尿素 (Ψ) 和N1-甲基伪尿素 (m1Ψ) 对RNase A和RNase 1裂变的敏感性.
- 阐明基底的分子机制,改变与未改变的RNA的差异性裂变率.
主要方法:
- 酶分析比较了UpA, ΨpA和m1ΨpA的RNase A和RNase 1的裂变速率.
- 酶结合核酸2',3'-环瓦纳酸复合物的X射线晶体学.
- 酶·二核酸复合物的分子动力学模拟.
- 量子化学计算以评估内在反应性.
主要成果:
- RNase A和RNase 1比 ΨpA或m1ΨpA更高效地切割了UpA,高达10倍.
- 结构分析显示U, Ψ和m1Ψ与RNase A和RNase 1具有相似的结合模式.
- 量子化学和实验水解数据表明,UpA的反应性增加是由于尿素的内在电子特性.
结论:
- 用伪尿素或N1-甲基伪尿素替代尿素,使其对RNase介导的裂变具有显著的抗性.
- 了解这些稳定性差异对于优化基于RNA的疗法和疫苗的设计和交付至关重要.
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