Protein Footprinting: Auxiliary Engine to Power the Structural Biology Revolution

Area of Science:

• Structural Biology
• Biochemistry
• Biophysics

Background:

• High-resolution structures of large complexes and membrane proteins are increasingly determined.
• Advancements in macromolecular crystallography and cryo-electron microscopy (Cryo-EM) drive these discoveries.
• Mass spectrometry techniques for protein structure analysis have significantly improved.

Purpose of the Study:

• To review the application of protein footprinting in understanding macromolecular systems.
• To highlight the utility of protein footprinting for challenging protein targets.
• To demonstrate hybrid approaches combining structural data and footprinting for structure-function insights.

Main Methods:

• Utilizing advancements in cryo-electron microscopy for high-resolution structural determination.
• Employing mass spectrometry-based protein footprinting for residue-level information.
• Integrating structural biology data with footprinting techniques.

Main Results:

• Protein footprinting provides detailed sub-peptide and residue-level information.
• This technique is valuable for validating structures, interactions, and dynamics.
• It is particularly effective for intrinsically disordered proteins, amyloidogenic proteins, and other recalcitrant systems.

Conclusions:

• High-resolution structural information serves as a foundation for hybrid approaches.
• Protein footprinting extends the understanding of macromolecular systems, especially those difficult to study by other methods.
• Combined techniques offer powerful insights into structure-function relationships.