Targeted Mass Spectrometry for Quantification of Receptor Tyrosine Kinase Signaling

Area of Science:

• Biochemistry
• Molecular Biology
• Proteomics

Background:

• Targeted proteomics offers sensitive and specific quantification of proteins and post-translational modifications.
• The RAS/MAPK signaling network plays a crucial role in cellular processes.

Purpose of the Study:

• To develop a methodology for multiplexed quantification of proteins and phosphosites in the RAS/MAPK signaling network.
• To enable sensitive and specific measurement of signaling pathways.

Main Methods:

• Coupling peptide immunoaffinity enrichment with targeted mass spectrometry.
• Utilizing anti-peptide antibodies for analyte enrichment.
• Employing heavy stable isotope-labeled internal standards.
• Direct measurement of enriched peptides using multiple-reaction monitoring (MRM).

Main Results:

• Successful development of a method for multiplexed quantification of RAS/MAPK signaling proteins and phosphosites.
• Quantitative measurements of phospho-signaling were achieved.
• The method demonstrates high sensitivity and specificity.

Conclusions:

• The developed method provides accurate quantitative measurements of phospho-signaling.
• This approach is generally applicable to other phosphopeptides and sample types.
• The methodology enhances the study of signaling networks.