协同使用FAIMS和IMS与MS/MS结合,有效地探测蛋白质的结构多样性
Kaiqun Wu1,2,3, Rong Liu1,2,3, Zhonghan Hu1,2,3
1Institute of Mass Spectrometry, Zhejiang Engineering Research Center of Advanced Mass Spectrometry and Clinical Application, Ningbo University, Ningbo 315211, P. R. China.
Journal of the American Society for Mass Spectrometry
|January 26, 2026
概括
研究人员开发了一种新的3D仪器,结合了场非对称波形离子运动谱学 (FAIMS) 和离子运动谱学 (IMS),以分离和识别细胞C蛋白离子的不同结构. 该方法使用质谱测量证实了不同的蛋白质对应物,为结构分析提供了强大的工具.
科学领域:
- 分析化学 分析化学
- 生物化学 生物化学
- 蛋白质组学是指蛋白质组学.
背景情况:
- 蛋白质结构分析对于理解功能至关重要.
- 在气相中区分蛋白质适配体存在重大挑战.
- 现有的方法往往缺乏分辨率来区分微妙的结构变化.
研究的目的:
- 开发和验证一个新的三维 (3D) 气相离子分离平台.
- 探测细胞染色体C离子的结构多样性.
- 为了证明将赛道场非对称波形离子移动谱仪 (r-FAIMS) 与离子移动谱仪 (IMS) 和四极飞行时间质谱仪 (QTOF MS) 集成的正交性和实用性.
主要方法:
- 开发一个3D仪器,将r-FAIMS与IMS-QTOF集成.
- 在+8到+19的电荷状态外中分析细胞染色体C离子.
- 使用离子碎片化 (MS/MS) 进行分离型的结构验证.
主要成果:
- 在IMS中观察到多个cytochrome C离子峰值 (+8到+11电荷状态),但在FAIMS中观察到单个峰值.
- 在FAIMS中观察到高电荷状态 (+13到+19) 的分离良好的多个峰值,表明了形状差异.
- MS/MS分析证实,不同FAIMS峰值的离子,尽管具有相似的碰撞横截面区域,但代表着不同的蛋白质合规体.
结论:
- 综合r-FAIMS-IMS-MS/MS技术提供高度直角的气相离子分离.
- 这种方法可以有效地分离蛋白质结构异构体.
- 该平台允许详细的IMS测量和直接MS/MS确认异构蛋白质.
相关概念视频
Protein and Protein Structure
87.2K
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme...
A protein's shape is critical to its function. For example, an enzyme...
87.2K
Structural Protein Function
29.9K
Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to...
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity. In bones and teeth, it mineralizes to...
29.9K
Structural Protein Function
3.2K
3.2K
Combined Effects of Drugs: Synergism
6.8K
Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
Such synergistic combinations...
Such synergistic combinations...
6.8K
Combined Effects of Drugs: Antagonism
11.7K
The combined effects of drugs can result in various interactions, of which an important type is antagonism. Antagonism is a mechanism where one drug inhibits or counteracts the effects of another drug. Antagonism can occur through various means, including receptor binding, allosteric modulation, functional interaction, chemical reactions, and pharmacokinetic processes.
The most common type is receptor antagonism, where one drug acts as an antagonist to block the effects of another drug by...
The most common type is receptor antagonism, where one drug acts as an antagonist to block the effects of another drug by...
11.7K
Protein and Protein Structures
18.9K
18.9K


