Two Birds with One Stone: Parallel Quantification of Proteome and Phosphoproteome Using iTRAQ

Area of Science:

• Proteomics
• Biochemistry
• Mass Spectrometry

Background:

• Altered protein levels and phosphorylation are linked to various diseases.
• Quantitative analysis of proteome and phosphoproteome aids in understanding pathology and identifying biomarkers.
• Isobaric mass tagging techniques, like iTRAQ, are increasingly used for relative protein quantification.

Purpose of the Study:

• To develop a straightforward protocol for simultaneous quantitative analysis of both the proteome and phosphoproteome from a single sample.
• To leverage the iTRAQ (isobaric tag for relative and absolute quantitation) method for multiplexed quantitative proteomics and phosphoproteomics.
• To optimize sample utilization in mass spectrometry-based quantitative analyses.

Main Methods:

• Utilized isobaric tag for relative and absolute quantitation (iTRAQ) chemistry for multiplexed sample analysis.
• Employed state-of-the-art liquid chromatography-mass spectrometry (LC-MS) approaches.
• Developed a protocol to analyze both global proteome and phosphoproteome from the same sample.

Main Results:

• Demonstrated a simple and straightforward protocol for quantitative proteome and phosphoproteome analysis.
• Showcased the efficient use of sample material in iTRAQ experiments, allowing for simultaneous analyses.
• Enabled comprehensive quantitative data generation from a small fraction of the total sample.

Conclusions:

• The presented iTRAQ-based protocol allows for efficient and simultaneous quantitative analysis of both proteome and phosphoproteome.
• This method provides a valuable tool for deeper understanding of disease mechanisms and biomarker discovery.
• Optimized sample utilization enhances the scope and efficiency of quantitative mass spectrometry-based studies.