时间分辨率紫外光解离质谱检测蛋白质稳定性和展开动态的突变诱导的变化
Pan Luo1,2,3,4, Zheyi Liu2,5, Can Lai2,3,5
1Institute of Advanced Science Facilities, Shenzhen 518107, China.
Journal of the American Chemical Society
|March 20, 2024
概括
使用时间解析原生质谱法 (TR- nMS) 检测二酸减少酶 (DHFR) 突变,发现蛋白质稳定性下降. 突变削弱了配因子NADPH的结合,促进了展开,并为药物设计提供了见解.
科学领域:
- 生物化学
- 结构生物学
- 质谱学
背景情况:
- 蛋白质的稳定性和动态性对于了解疾病机制和开发向疗法至关重要.
- 突变可以改变蛋白质的结构和功能,导致病态状况.
- 乙酸减少酶 (DHFR) 是细胞代谢中的关键酶,也是常见的药物点.
研究的目的:
- 建立一个时间解析原生质谱 (TR-nMS) 平台来监测蛋白质展开.
- 研究特定突变 (M42T/H114R) 对DHFR稳定性和结构动态的影响.
- 阐明NADPH辅因子在稳定DHFR结构中的作用以及突变如何影响这种相互作用.
主要方法:
- 开发一种快速混合的毛细血管装置,用于定时原生质谱 (TR-nMS).
- 用TR-nMS监测酸启动的展开,以评估蛋白质稳定性的变化.
- 对光片进行193nm紫外光解离 (UVPD) 分析,以分析展开的分子细节.
主要成果:
- 与野生型DHFR (WT- DHFR) 相比,M42T/ H114R突变二酸减少酶 (MT- DHFR) 的稳定性显著降低.
- UVPD分析显示,辅因子NADPH可以稳定DHFR结构.
- M42T/ H114R突变降低了NADPH和DHFR之间的相互作用,促进了蛋白质的展开.
结论:
- 已建立的TR-nMS平台有效监测蛋白质稳定性和动态的突变诱导变化.
- M42T/H114R突变通过削弱NADPH结合来破坏DHFR的稳定性,为病理过程提供了分子基础.
- 这种方法为探测药物点的微妙稳定性和动态变化提供了有价值的工具.
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