使用循环离子移动和电子捕获解离的中下质量范围的同位素蛋白质的完全分离和测序
Francis Berthias1, Dale A Cooper-Shepherd2, Frederik H V Holck1
1Department of Biochemistry and Molecular Biology, VILLUM Center for Bioanalytical Sciences, University of Southern Denmark, DK-5230 Odense M, Denmark.
Analytical chemistry
|July 12, 2023
概括
这项研究引入了一种新的循环离子运动谱法,加上电子捕获解离 (cIM-MS/MS(ECD)) 来分离和测序异构的复杂混合物. 这种先进的技术成功地区分了非常相似的蛋白质形式,这对于理解它们的生物功能至关重要.
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 生化学
背景情况:
- 区分由翻译后修改 (PTMs) 生成的独特蛋白质形式是一个主要的分析挑战.
- 异构蛋白质形式通常会产生模拟的双重质谱,阻碍结构特征.
- 传统的分离方法与大同位素和完整的蛋白质作斗争.
研究的目的:
- 开发和验证一种新型的高分辨率循环离子流动性光谱 (cIM) 技术,用于分离和测序大型异构.
- 将cIM与飞行式电子捕获解离 (ECD) 结合起来,以进行增强的蛋白形状分析.
- 为了证明这种技术在复杂的生物混合物中的能力.
主要方法:
- 利用高分辨率的循环离子移动谱法 (cIM) 来进行气相离子分离.
- 集成了一个电磁静电池用于飞行中的电子捕获解离 (ECD).
- 应用了cIM-MS/MS(ECD) 方法,对三元混合物中素H3的N-尾异构体 (∼5.4kDa).
主要成果:
- 实现了单基和三基甲基化素H3 N-尾异构体的完全分离.
- 显示的平均分辨率为 ~400,分辨率为 1.5.5.
- 获得了近100%的氨基酸序列覆盖率,用于分离的异构体.
结论:
- 该cIM-MS/MS(ECD) 技术显示出中向下和上向下蛋白质组学的巨大潜力.
- 这种方法有助于识别具有关键生物功能的近似蛋白质.
- 能够对复杂的蛋白形混合物进行增强的结构特征.
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