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Quantitative phosphoproteomic analysis using iTRAQ method.

Tomoya Asano1, Takumi Nishiuchi

  • 1Division of Functional Genomics, Advanced Science Research Center, Kanazawa University, 920-0934, Kanazawa, Japan.

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|June 9, 2014
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Summary

Mitogen-activated protein kinase kinase (MAPKK) is crucial for plant responses. Quantitative phosphoproteomics using isobaric tag for relative and absolute quantitation (iTRAQ) identified downstream phosphoproteins affected by MAPKK signaling.

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Area of Science:

  • Plant molecular biology
  • Proteomics
  • Signal transduction

Background:

  • Mitogen-activated protein kinase (MAPK) cascades are vital for plant development and environmental responses.
  • Phosphoproteomics enables the identification of proteins regulated by MAPK signaling pathways.

Purpose of the Study:

  • To introduce a quantitative phosphoproteomic analysis using chemical labeling for studying MAPK pathways.
  • To identify downstream phosphoproteins regulated by MAPKK in Arabidopsis thaliana.

Main Methods:

  • Quantitative phosphoproteomics was performed using the isobaric tag for relative and absolute quantitation (iTRAQ) method.
  • Peptides were labeled with stable isotope-coded tags and analyzed by mass spectrometry (MALDI TOF/TOF).
  • Phosphoproteins were enriched from phytotoxin-treated wild-type and mapkk mutant Arabidopsis plants.

Main Results:

  • The study identified numerous phosphoproteins affected by MAPKK signaling.
  • A significant decrease in specific phosphoproteins was observed in the mapkk mutant compared to wild-type plants.

Conclusions:

  • Quantitative phosphoproteomics with iTRAQ is effective for studying plant signaling pathways.
  • MAPKK signaling significantly influences the phosphoproteome in Arabidopsis, particularly under stress conditions.