Comparative phosphoproteomics reveals evolutionary and functional conservation of phosphorylation across eukaryotes

Area of Science:

• Molecular Biology
• Evolutionary Biology
• Systems Biology

Background:

• Reversible protein phosphorylation regulates diverse cellular processes, including signaling and protein complex assembly.
• The structure and evolution of phosphorylation networks remain largely unexplored.
• High-throughput phosphoproteomics has generated extensive datasets for various model organisms.

Purpose of the Study:

• To comparatively analyze phosphorylation events across different eukaryotic species using novel phosphoproteomics data.
• To investigate the evolutionary conservation and dynamics of phosphorylation networks.

Main Methods:

• Comparative analysis of phosphoproteomics datasets from six eukaryotic species.
• Examination of overlapping phosphorylation sites between species with varying phylogenetic distances.

Main Results:

• Phosphoproteome overlap varied significantly, from ~700 sites (human/mouse) to a single site (fish/yeast).
• Conserved phosphorylation events shared by plants and animals suggest conservation over a billion years.
• Overlap between phosphoproteomes exceeded chance, indicating functional relevance and mirroring species phylogeny.

Conclusions:

• Comparative analysis of phosphoproteomics datasets offers a framework for generating biological insights.
• The growing volume of mass spectrometry data will enhance comparative phosphoproteomics as a tool for studying phosphorylation dynamics.