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Area of Science:

  • Biochemistry
  • Proteomics
  • Cell Signaling

Background:

  • Proteins with multiple post-translational modifications (PTMs) have functions modulated by their specific modification patterns.
  • Precise characterization of these complex proteoforms is analytically challenging.
  • MEK1 (MAP2K1) is a key kinase in the mitogen-activating protein kinase (MAPK) pathway, regulating cell signaling.

Purpose of the Study:

  • To develop and apply a mass spectrometry-based method for comprehensive characterization of MEK1 phosphoproteoforms.
  • To map the landscape of MEK1 phosphorylation states in a relevant biological context.
  • To provide a "bird's eye" view of pathway signaling activity through proteoform analysis.

Main Methods:

  • Utilized individual ion mass spectrometry, a charge-detection method, for top-down analysis of intact protein ions.
  • Applied fragmentation techniques to analyze labile modifications on MEK1 proteoforms.
  • Quantified the stoichiometry and distribution of MEK1 phosphorylations in a cellular model.

Main Results:

  • Demonstrated reproducible handling of complex phosphoproteoform mixtures and their fragment ions.
  • Successfully mapped the proteoform landscape of MEK1, revealing the distribution of 0-4 phosphorylations.
  • Determined MEK1 phosphorylation patterns in a cellular model of drug-resistant metastatic melanoma.

Conclusions:

  • Individual ion mass spectrometry enables detailed characterization of multiply modified proteoforms.
  • This approach provides insights into signaling pathway dynamics by mapping proteoform landscapes.
  • The method is generalizable to other complex proteoforms where PTM combinations are critical for function and drug response.