Protein Phosphorylation Dynamics: Unexplored Because of Current Methodological Limitations: Dynamics of Processive...

Area of Science:

• Biochemistry
• Molecular Biology
• Systems Biology

Background:

• Investigating intrinsic phosphorylation dynamics and kinetics in complex protein architectures in vivo presents significant challenges.
• Methodological limitations have hindered understanding of phosphate group turnover, synergy, and cooperativity between phosphorylation sites (P-sites).

Purpose of the Study:

• To explore the complexity of in vivo phosphorylation using advanced analytical technologies and curated databases.
• To propose hypothetical scenarios for combinatorial processive phosphorylation that extend current signaling pathway models.

Main Methods:

• Leveraging powerful analytical technologies developed over the last decade to catalog the phosphoproteome.
• Utilizing curated databases of phospho sites identified by mass spectrometry and computationally predicted sites based on kinase motifs.

Main Results:

• Despite advancements, significant discrepancies exist between different phosphoproteomic analysis methods.
• Hypothetical scenarios for combinatorial processive phosphorylation are proposed, highlighting limitations of current methodologies.

Conclusions:

• Current methodologies face challenges in verifying complex phosphorylation scenarios.
• Proposed postulates offer potential extensions to known in vivo signaling activation/inhibition schemes.