Comparative analysis reveals conserved protein phosphorylation networks implicated in multiple diseases.

Area of Science:

• Molecular Biology
• Evolutionary Biology
• Systems Biology

Background:

• Cellular information processing relies on protein kinases and phosphorylation events.
• The evolutionary history and physiological significance of many human phosphorylation sites are not fully understood.
• Characterizing conserved signaling pathways is crucial for understanding fundamental biological processes.

Purpose of the Study:

• To investigate the evolutionary conservation of human phosphorylation events in model organisms.
• To identify conserved kinase-substrate networks and their associated proteins.
• To explore the link between conserved signaling events and complex diseases.

Main Methods:

• Comparative analysis of phosphoproteomes from human, fly, worm, and yeast.
• Sequence-alignment approach to identify positionally conserved phosphorylation sites.
• Network-alignment approach to reconstruct conserved kinase-substrate networks.

Main Results:

• Identified 479 positionally conserved phosphorylation events in 344 human proteins across ~600 million years of evolution.
• Discovered 778 phosphorylation events in 698 human proteins through network-alignment.
• Found that conserved phosphoproteins are enriched in proteins encoded by disease-associated genes.
• Revealed convergence of multiple complex diseases within conserved molecular networks.

Conclusions:

• Phosphorylation site conservation varies, with some sites evolving rapidly and others being ancient.
• Both site-level and network-level analyses are valuable for studying signaling conservation.
• Conserved signaling networks may represent common molecular underpinnings for complex diseases.
• This research provides insights into fundamental cellular processes and disease mechanisms.