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Phosphoprotein profiling by PA-GeLC-MS/MS.

Kolbrun Kristjansdottir1, Donald Wolfgeher, Nick Lucius

  • 1Department of Molecular Genetics and Cell Biology, and Ludwig Center for Metastasis Research, The University of Chicago, Chicago, Illinois 60637, USA.

Journal of Proteome Research
|May 31, 2008
PubMed
Summary

This study introduces a new method, PA-GeLC-MS/MS, to identify protein complexes involved in phosphorylation. This technique helps understand how protein phosphorylation regulates complex composition and interactions in cells.

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Area of Science:

  • Proteomics
  • Molecular Biology
  • Biochemistry

Background:

  • Protein phosphorylation critically regulates protein-protein interactions and complex dynamics.
  • While phosphoproteomics and protein complex data are abundant, their interdependence remains underexplored.

Purpose of the Study:

  • To develop and validate a method for identifying candidate phosphoprotein complexes.
  • To investigate the relationship between protein phosphorylation and protein complex composition.

Main Methods:

  • Developed a phosphoprotein affinity chromatography method using Pro-Q Diamond resin.
  • Combined size exclusion chromatography, gel electrophoresis, and tandem mass spectrometry (PA-GeLC-MS/MS).
  • Analyzed protein eluates from yeast cell extracts to identify phosphoproteins and their interacting partners.

Main Results:

  • PA-GeLC-MS/MS identified 108 proteins, predominantly known phosphoproteins.
  • Size fractionation revealed monomeric phosphoproteins (<100 kDa) and protein complexes (>100 kDa).
  • The >100 kDa fraction contained 171 proteins involved in known interactions, with few being known phosphoproteins, suggesting their purification via complex association.

Conclusions:

  • The developed method effectively isolates phosphoprotein complexes.
  • This approach provides insights into how phosphorylation influences protein complex assembly and function.
  • Facilitates the study of dynamic regulation in multiprotein complexes.