通过将双离子道接口与三重四极质谱仪相结合,提高针对单细胞蛋白质组学的灵敏度.
bioRxiv : the preprint server for biology
|January 9, 2026
概括
一个新的双离子漏斗接口显著提高了单细胞蛋白质组学 (SCP) 的质谱学灵敏度. 这一突破使低丰度蛋白质的可靠量化成为可能,克服了超敏感SCP应用中的关键分析瓶.
科学领域:
- 蛋白质组学和质谱学
- 细胞生物学和异质性 细胞生物学和异质性
- 分析化学和仪器仪表技术
背景情况:
- 单细胞蛋白质组学 (SCP) 提供了对细胞异质性的高分辨率见解,但由于蛋白质含量极低而面临敏感性限制.
- 在三重四极 (QqQ) 仪器上使用选择反应监测 (SRM) 的有针对性的量化是敏感的,但在单细胞样本中与低丰度蛋白质作斗争.
- 目前的质谱仪器仪表需要增强的灵敏度来分析单个细胞中的蛋白质水平的形图和图形图.
研究的目的:
- 开发和评估一种新的双离子漏斗接口,以提高商用QqQ质谱仪中的离子传输效率.
- 为了解决量化向单细胞蛋白质组学的关键分析瓶.
- 提高在单细胞样本中分析低丰度蛋白质的灵敏度和可重复性.
主要方法:
- 开发一个双离子漏斗接口,包括一个曲的S漏斗和一个常规的离子漏斗.
- 系统性性能比较双离子接口与TSQ Vantage质谱平台上的标准接口.
- 对不同复杂度的生物样本进行评估,包括小鼠巨细胞和人类细胞.
主要成果:
- 双离子漏斗接口在各种蛋白质度和生物矩阵中实现了高达25倍的灵敏度改善.
- 增强的灵敏度与增加的分析可重现性相关,由较低的变化系数证明.
- 能够对以前无法检测到的低丰度蛋白质进行可靠的量化,并将分析扩展到单细胞等价量.
结论:
- 双离子漏斗接口有效地克服了单细胞分析量化向蛋白质组学的灵敏度限制.
- 这一技术进步为超敏感的向单细胞蛋白质组提供了基础,需要高灵敏度和强大的定量性能.
- 开发的接口显著提高了离子传输,减少了化学噪声,为从单细胞获得更深入的生物学见解铺平了道路.
更多相关视频
12:11Simultaneous Affinity Enrichment of Two Post-Translational Modifications for Quantification and Site Localization
Published on: February 27, 2020
7.3K
11:49Quantitative Proteomics Workflow using Multiple Reaction Monitoring Based Detection of Proteins from Human Brain Tissue
Published on: August 28, 2021
5.0K
相关概念视频
Mass Analyzers: Common Types
1.4K
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
1.4K
Tandem Mass Spectrometry
2.3K
Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
2.3K
Peptide Identification Using Tandem Mass Spectrometry
8.1K
Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
8.1K
Mass Analyzers: Overview
1.6K
The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
1.6K
Mass Spectrometry: Complex Analysis
1.6K
Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
GC–MS is a powerful hyphenated method commonly used in forensics and environmental...
1.6K
Mass Spectrometers
8.2K
This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
8.2K
