MSX-3D: a tool to validate 3D protein models using mass spectrometry.

Area of Science:

• Biochemistry
• Structural Biology
• Computational Biology

Background:

• Chemical cross-linking coupled with mass spectrometry offers insights into protein structure and subunit interactions.
• This technique is valuable for studying protein structures when NMR and X-ray crystallography data are unavailable.

Purpose of the Study:

• To introduce MSX-3D, a computational tool designed for validating protein models.
• To enable interactive 3D visualization of distance constraints derived from cross-linking experiments.

Main Methods:

• Utilizes mass spectrometry data from chemical cross-linking experiments.
• Incorporates peptide identification and analysis.
• Features interactive 3D visualization capabilities.

Main Results:

• MSX-3D facilitates the validation of protein models.
• The tool integrates peptide identification with 3D structural representation.
• It visualizes distance constraints derived from cross-linking experiments.

Conclusions:

• MSX-3D enhances the utility of mass spectrometry in structural biology.
• The tool aids in the experimental investigation of protein structures.
• MSX-3D is freely available for use in protein model validation.