碰撞诱导的展开,协奏MS,自下而上的蛋白质学和相互作用学用于在本地表面质谱中识别蛋白质复合体
Raul A Villacob1, Neda Feizi1, Sarah C Beno1
1Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798, United States.
Journal of the American Society for Mass Spectrometry
|December 14, 2023
概括
这项研究引入了一种新的多端方法,结合了原生表面质谱 (NSMS),并联质谱和自下而上的蛋白质组学,以直接从生物表面增强蛋白质特征,克服电离化的挑战.
科学领域:
- 生物化学 生物化学
- 分析化学 分析化学
- 蛋白质组学是指蛋白质组学.
背景情况:
- 生物表面含有盐和矩阵成分,通过抑制电离和促进 adduct 形成来阻碍蛋白质识别.
- 在生物样本中表征可变蛋白质是具有挑战性的,因为时间密集的净化步骤可能会破坏非共价相互作用.
研究的目的:
- 开发和验证一种多边分析方法,以从原生生物表面直接改进蛋白质特征.
- 克服传统方法在分析复杂的生物样本没有广泛的预处理时的局限性.
主要方法:
- 本地表面质谱 (NSMS),双重质谱 (MS/MS) 和自下而上的蛋白质组学的整合.
- 从单个表面提取的样本获取数据,包括NSMS,MS/MS和离子移动性 (IM) 数据.
- 碰撞诱导展开 (CIU) 与IM-MS结合用于结构洞察的应用.
主要成果:
- 在混合物中的9种表面沉积蛋白 (8147 kDa) 和未经处理的肝中的内源蛋白 (高达 ~ 220 kDa) 的成功表征.
- 下向蛋白质组学有助于匹配NSMS中观察到的蛋白质和MS/MS中它们的子单位.
- 离子移动性质谱 (IM-MS) 为蛋白质和复合体提供了高达145kDa的碰撞截面和展开路径.
结论:
- 结合NSMS,MS/MS和自下而上的蛋白质组学方法显著改善了来自本地生物表面的蛋白质表征.
- 这种方法可以在没有破坏性净化步骤的情况下分析不稳定蛋白质和复合物,从而保持本地相互作用.
- 该技术有效分析复杂的生物矩阵,包括未经处理的组织样本,为蛋白质组提供更深入的见解.
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