Mass Spectrometry Structural Proteomics Enabled by Limited Proteolysis and Cross-Linking

Area of Science:

• Proteomics
• Structural Biology
• Molecular Biology

Background:

• Protein structure and function are central to life sciences.
• Mass spectrometry (MS) is increasingly used to study protein conformation.
• MS-based structural proteomics complements traditional methods.

Purpose of the Study:

• To review two key MS-based techniques: limited proteolysis-mass spectrometry (LiP-MS) and cross-linking mass spectrometry (XL-MS).
• To discuss data interpretation, bioinformatics, and applications of these methods.
• To highlight factors influencing protein conformational changes and remaining challenges.

Main Methods:

• Review of limited proteolysis-mass spectrometry (LiP-MS) principles, features, and workflows.
• Review of cross-linking mass spectrometry (XL-MS) principles, features, and workflows.
• Discussion of bioinformatics strategies and software for data interpretation.

Main Results:

• LiP-MS and XL-MS provide peptide-level readouts of protein conformation.
• These techniques have diverse applications in neurodegenerative diseases, interactome studies, and membrane protein analysis.
• Bioinformatics tools are crucial for interpreting MS-based structural data.

Conclusions:

• LiP-MS and XL-MS are powerful tools for studying protein conformational dynamics.
• Integration with computational methods enhances structural analysis.
• Further research is needed to fully understand protein conformational changes using these MS techniques.