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Related Concept Videos

Mass Spectrometry: Complex Analysis01:21

Mass Spectrometry: Complex Analysis

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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.
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Peptide Identification Using Tandem Mass Spectrometry01:33

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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...
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Related Experiment Video

Updated: Mar 15, 2026

Combining Chemical Cross-linking and Mass Spectrometry of Intact Protein Complexes to Study the Architecture of Multi-subunit Protein Assemblies
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Developing a Multiplexed Quantitative Cross-Linking Mass Spectrometry Platform for Comparative Structural Analysis of

Clinton Yu1, Alexander Huszagh1, Rosa Viner2

  • 1Department of Physiology & Biophysics, University of California, Irvine , Irvine, California 92697, United States.

Analytical Chemistry
|September 15, 2016
PubMed
Summary

We developed QMIX, a multiplexed quantitative cross-linking mass spectrometry (QXL-MS) strategy. This method enables simultaneous comparison of multiple protein complex samples, advancing the study of protein-protein interactions (PPIs).

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Area of Science:

  • Structural Biology
  • Proteomics
  • Biochemistry

Background:

  • Cross-linking mass spectrometry (XL-MS) is a key technique for studying protein-protein interactions (PPIs) and protein assembly structures.
  • Quantitative XL-MS (QXL-MS) using isotope-labeled cross-linkers has enabled dynamic studies but is often limited to pairwise comparisons.
  • Analyzing multiple protein complex samples simultaneously is crucial for comprehensive structural and interaction dynamics studies.

Purpose of the Study:

  • To develop a robust workflow for simultaneous comparative analysis of multiple cross-linked protein samples.
  • To establish a multiplexed quantitative cross-linking mass spectrometry (QXL-MS) strategy for enhanced proteome-scale analysis.
  • To enable detailed investigation of conformational dynamics in protein complexes and PPIs.

Main Methods:

  • Developed QMIX (Quantitation of Multiplexed, Isobaric-labeled cross (X)-linked peptides), a novel multiplexed QXL-MS strategy.
  • Integrated MS-cleavable cross-linkers with isobaric labeling reagents for simultaneous sample analysis.
  • Established a new analytical platform for quantitative analysis of cross-linked peptides.

Main Results:

  • Successfully established a multiplexed QXL-MS strategy (QMIX) for simultaneous comparative analysis.
  • The QMIX platform facilitates quantitative analysis of cross-linked peptides from multiple samples.
  • This approach overcomes limitations of pairwise comparisons in previous QXL-MS strategies.

Conclusions:

  • QMIX provides a powerful new analytical platform for quantitative proteomics.
  • The developed strategy enables multiplexed comparisons of protein complex conformational dynamics.
  • This method has broad applications for proteome-scale studies of PPIs and structural biology.