使用直接质量技术剖析蛋白质复合样本的异质群体
Robert L Rider1, Jared Hampton1, Zhenyu Xi1
1Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States.
Analytical chemistry
|December 2, 2025
概括
电荷检测质谱 (CDMS) 现在可以对异质蛋白样本进行定量分析. 这种技术准确地测量了质量和丰度,推动了生物研究.
科学领域:
- 质谱测量质量谱测量
- 生物物理化学 生物物理化学
- 蛋白质组学是指蛋白质组学.
背景情况:
- 电荷检测质谱 (CDMS) 是一种新兴的技术,用于对异质生物样本进行定性分析.
- 基于轨道飞行器的CDMS增加了该技术在本地质谱 (nMS) 中的使用.
- 目前CDMS的应用主要是定性性的,在MDa范围内进行的定量研究有限.
研究的目的:
- 为了证明基于Orbitrap的CDMS/直接质量技术 (DMT) 对100kDa以下的异质蛋白样本的定量能力.
- 分析使用DMT的跨甲状腺素 (TTR) 变体的稳定性和结合因子特性.
- 建立CDMS作为复杂生物系统的可行的定量方法.
主要方法:
- 利用基于轨道飞行器的CDMS/直接质量技术 (DMT) 进行高分辨率质量分析.
- 已确定和量化野生类型 (WT) 和C端标记 (CT) 的TTR同位素和混合四位素.
- 分析了混合TTR的动态形成,并量化了对TTR变体的甲状腺素结合.
主要成果:
- DMT成功地解决了WT和CT TTR同位四度体和混合四度体,从而实现了动力分析.
- 与WT-TTR相比,CT-TTR同位四聚体的稳定性下降,这表明C端修饰影响四聚体的稳定性.
- DMT量化了甲状腺素结合,揭示CT-TTR的亲和力比WT-TTR更高,表明C端参与了连接体结合.
- CDMS分离了重叠的m/z信号,使异质样本的质量和丰度能够准确地确定.
结论:
- 基于Orbitrap的CDMS/DMT被确立为异质蛋白样本的定量方法.
- TTR的C终端修饰影响了四聚体稳定性和甲状腺素结合亲和力.
- 在分析复杂的生物系统方面,CDMS显示出更广泛应用的巨大潜力.
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