动态四极选择将前体质与MS/MS产品关联在数据独立获取中.
Keaton L Mertz1, Lia R Serrano1, Pavel Sinitcyn2
1Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.
Journal of the American Society for Mass Spectrometry
|August 8, 2025
概括
这项研究引入了一种新的数据独立采集质谱法,该方法可变化四极选择宽度,以改善前体离子识别. 这种技术通过解决同隔离的前体来增强蛋白质组分析,从而获得更准确的结果.
科学领域:
- 蛋白质组学是指蛋白质组学.
- 分析化学 分析化学
- 质谱测量质量谱测量
背景情况:
- 数据独立采集 (DIA) 质谱仪使高通量蛋白质组分析成为可能.
- 传统的DIA方法往往共同选择多个前体离子,从而导致虚构光谱和精度降低.
- 解决同隔离的前体对于提高自下而上的蛋白质组学研究的可靠性至关重要.
研究的目的:
- 开发和评估一种新的DIA质谱法,以改善前体离子识别.
- 在复杂的蛋白质样本中增强同隔离的前体离子的分辨率.
- 用各种校准仪和样本类型来评估方法的性能.
主要方法:
- 实施了一种在离子积累过程中四极选择宽度变化的方法.
- 扫描对扫描产品离子强度配置文件被用于通过重叠的选择窗口来推断前体质量.
- 该技术在Q-Orbitrap质量分析仪上使用内部校准剂和三位一体消化单克隆抗体样本进行了测试.
- 直接输注和液态染色学用于样品分析.
主要成果:
- 该方法成功地将产品离子强度与前体离子质量相结合.
- 叠加的选择窗口使得从产品离子配置文件中推断出前体质量.
- 在直接输注中,分隔1Th的前体被使用5Th重叠的10Th窗口解决.
- 产品离子与其前体m/z的0.3 Th以内结合,产生前体离子m/z的分辨率约为33.3.
结论:
- 描述的方法有效地解决了在DIA质谱学中同隔离的前体离子.
- 这种技术显著提高了前体离子m/z的分辨能力,提高了蛋白质原子数据的准确性.
- 该方法证明了用于分析复杂蛋白质组样本的广泛适用性,包括抗体消化剂.
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