Structural mass spectrometry of membrane proteins

Area of Science:

• Biochemistry and Structural Biology
• Analytical Chemistry
• Proteomics

Background:

• Mass spectrometry (MS) has evolved dramatically since its inception, moving from simple polypeptide analysis to complex sample characterization.
• The development of electrospray ionization (ESI) in the 1980s and structural MS methods in the 1990s paved the way for advanced protein analysis.
• Membrane proteins, vital targets in biopharmaceuticals, present unique analytical challenges due to their complexity and heterogeneity.

Purpose of the Study:

• To review the evolution and application of structural mass spectrometry (MS) techniques for analyzing membrane proteins.
• To highlight the diverse structural information obtainable from MS-based methods for membrane proteins.
• To showcase historical and contemporary applications of structural MS in membrane protein research.

Main Methods:

• Review of major structural mass spectrometry (MS) methodologies.
• Focus on MS applications for membrane protein analysis.
• Discussion of techniques for proteoform characterization, stoichiometry, ligand binding, conformation, dynamics, and distance restraints.

Main Results:

• Structural MS methods provide comprehensive data on membrane protein attributes.
• Techniques cover sequencing, proteoform characterization, stoichiometry, and non-covalent interactions (ligands, drugs, lipids).
• MS enables detailed insights into membrane protein conformations, dynamics, and structural modeling via distance restraints.

Conclusions:

• Structural mass spectrometry is a powerful and versatile tool for dissecting membrane protein structure and function.
• The continuous advancement of MS instruments and methods enhances the scope and depth of membrane protein analysis.
• These MS-based approaches are indispensable for understanding membrane proteins, with significant implications for the biopharmaceutical industry.