高分辨率的四极子提高了光谱纯度,并减少了异多重化定量蛋白质组中非目标离子的干扰
Shen Zhang1, J C Yves Le Blanc2, Brett Larsen3
1SCIEX, Vaughan, Ontario, L4K 4V8, Canada; Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Sinai Health, Toronto, Ontario, M5G 1X5, Canada; NHC Key Laboratory of Human Stem Cell and Reproductive Engineering, School of Basic Medical Sciences, Central South University, Changsha, Hunan, 410075, China; Clinical Research Center for Reproduction and Genetics in Hunan Province, Reproductive and Genetic Hospital of CITIC-XIANGYA, Changsha, Hunan, 410000, China.
高分辨率四极隔离通过提高光谱纯度和减少模拟光谱干扰来显著提高质谱 (MS) 蛋白质组学准确性. 这种方法可以改善的识别和量化,这对于临床应用至关重要.
科学领域:
- 蛋白质组学是指蛋白质组学.
- 分析化学 分析化学
- 生物化学 生物化学
背景情况:
- 基于质谱 (MS) 的蛋白质组学对于蛋白质的识别和量化至关重要.
- 由多个前体碎片化产生的化学光谱,损害了标识和同位素质量标记 (IMT) 量化中的准确性.
- 现有的解决方案,如计算解卷和离子移动性分离,具有局限性,使得较窄的隔离窗口未得到充分探索.
研究的目的:
- 为了研究更窄的四极隔离窗口对光谱纯度,识别精度和基于MS的蛋白质组学定量精度的影响.
- 评估高分辨率隔离在缓解嵌合式光谱干扰方面的有效性.
主要方法:
- 使用了SCIEX TripleTOF仪器,其四极极优化为0.1Da (FWHH) 的前体隔离.
- 采用了三种蛋白质组模型 (酵母,人,大肠杆菌) 与8个复数的iTRAQ标签来评估干扰效应.
- 与标准分辨率四极极分离 (0.7Da) 的结果进行比较.
主要成果:
- 高分辨率隔离 (0.1Da) 显著提高了光谱纯度,并减少了非目标前体的量化干扰.
- 该策略减少了由嵌合式光谱引起的错误识别.
- 观察到敏感性损失的权衡,这表明与其他技术 (如离子移动性) 的潜在协同作用.
结论:
- 高分辨率四极隔离 (0.1 Da) 与标准隔离 (0.7 Da) 相比,明显提高了光谱纯度和量化精度.
- 这种方法有效地减少了源自虚构光谱的错误识别.
- 该方法在临床蛋白质组学中显示出对高精度分析的显著前景.
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