Panoramic Perspective on Human Phosphosites

Area of Science:

• Biochemistry
• Proteomics
• Structural Biology

Background:

• Protein phosphorylation is a critical post-translational modification regulating cellular processes.
• Mass spectrometry-based phospho-proteomics has generated vast datasets.

Purpose of the Study:

• To analyze and characterize proteome-wide phosphorylation sites (P-sites) using large-scale phospho-proteomics data.
• To differentiate true P-sites from false positives and understand their structural and biophysical context.

Main Methods:

• Leveraging the Scop3P database for large-scale phospho-proteomics data analysis.
• Employing five site properties to validate P-sites.
• Analyzing P-site context in protein structure, solvent accessibility, disorder, and biophysical properties.

Main Results:

• Successfully differentiated true P-sites from false positives.
• Characterized P-sites based on structural and biophysical properties.
• Investigated disease-linked mutations near P-sites and assessed dynamics of phosphorylated vs. unphosphorylated states.

Conclusions:

• Large-scale reprocessing of proteomics data provides a reliable view of proteome-wide P-sites.
• Structural context aids in uncovering conformational changes upon phosphorylation.
• Phosphorylation influences protein dynamics differently compared to non-phosphorylated sites.