Mass spectrometry supported determination of protein complex structure

Area of Science:

• Structural Biology
• Biochemistry
• Proteomics

Background:

• Protein complexes are crucial for biological processes.
• Understanding protein complex structure is vital for elucidating function.
• Traditional methods like X-ray crystallography and NMR have limitations for certain complexes.

Purpose of the Study:

• To review recent advancements in chemical cross-linking mass spectrometry (CX-MS) and native mass spectrometry (MS).
• To highlight the application of these MS-based techniques in tackling challenging structural biology problems.
• To emphasize the utility of low-resolution structural data for complex characterization.

Main Methods:

• Native MS for characterizing composition, stoichiometry, and connectivity.
• Affinity purification coupled with MS (AP-MS) for complex analysis.
• Chemical cross-linking MS (CX-MS) for protein-protein interactions and spatial proximity data.
• Hydrogen-deuterium exchange MS for mapping protein-protein binding sites.

Main Results:

• MS-based methods provide valuable low-resolution structural information.
• CX-MS offers distance constraints for residue proximity within complexes.
• Native MS elucidates the native architecture of protein complexes.
• These methods are particularly useful for protein complexes refractory to high-resolution techniques.

Conclusions:

• Recent developments in CX-MS and native MS enhance the study of protein complex structure.
• These techniques complement traditional methods, expanding structural biology's capabilities.
• MS-based approaches are critical for understanding the function of complex biological systems.