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11:13
Identification of Kinase-substrate Pairs Using High Throughput Screening
Published on: August 29, 2015
Cooperativity within proximal phosphorylation sites is revealed from large-scale proteomics data.
Regev Schweiger1, Michal Linial
1School of Computer Science and Engineering, Hebrew University of Jerusalem, 91904, Israel.
Biology Direct
|January 27, 2010
Summary
Phosphorylation involves clusters of Serine/Threonine (pS/pT) sites, not Tyrosine (pY) sites, acting as key regulatory units. These clusters, often activated by the same kinase, enhance the robustness of cellular responses.
Area of Science:
- Proteomics
- Molecular Biology
- Biochemistry
Background:
- Phosphorylation is a crucial post-translational modification in eukaryotes.
- Multisite phosphorylation regulates biological responses.
- Advances in mass spectrometry enable large-scale phosphosite analysis.
Purpose of the Study:
- To analyze spatial and functional properties of ~70,000 reported phosphosites.
- To understand the role of phosphosite distribution in eukaryotic proteins.
- To investigate the functional relevance of phosphosite clustering.
Main Methods:
- Statistical analysis of a large dataset of identified phosphosites.
- Examination of phosphosite positioning along protein sequences.
- Correlation analysis between phosphosite proximity and kinase activation.
Main Results:
- Phosphosites (pS/pT) cluster spatially, with 54% of sites near another within 4 amino acids.
- Clustered pS/pT sites show a tendency for co-activation by the same kinase.
- Phosphosite distribution patterns are conserved across most eukaryotic proteins.
Conclusions:
- Phosphosite clusters (pS/pT, not pY) are fundamental units in phosphorylation regulation.
- Kinase co-activation of clustered sites overrides single-kinase activation.
- Phosphosite clustering enhances the robustness and effectiveness of cellular signaling.
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