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Related Experiment Videos

Two-dimensional electrophoresis for plant proteomics.

Walter Weiss1, Angelika Görg

  • 1Technische Universität München, Fachgebiet Proteomik, Freising-Weihenstephan, Germany.

Methods in Molecular Biology (Clifton, N.J.)
|November 10, 2006
PubMed
Summary

Two-dimensional gel electrophoresis (2-DE) using immobilized pH gradients (IPGs) and mass spectrometry (MS) is a powerful proteomic analysis tool. This method enhances plant proteome analysis by resolving thousands of proteins, including low abundance ones.

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Area of Science:

  • Proteomics
  • Biochemistry
  • Molecular Biology

Background:

  • Two-dimensional gel electrophoresis (2-DE) coupled with mass spectrometry (MS) is the standard for proteome analysis.
  • 2-DE separates proteins by isoelectric point (pI) and molecular mass (Mr), revealing expression levels, isoforms, and post-translational modifications.
  • Modern 2-DE with immobilized pH gradients (IPGs) surpasses older methods in reproducibility, handling, and resolution, especially for acidic/alkaline proteins.

Purpose of the Study:

  • To provide a comprehensive protocol for plant proteome analysis using current 2-DE technology.
  • To detail the individual steps involved in advanced 2-DE for plant samples.
  • To highlight the capabilities of IPG-based 2-DE for high-resolution proteomic studies.

Main Methods:

Related Experiment Videos

  • Utilizes two-dimensional gel electrophoresis (2-DE) with immobilized pH gradients (IPGs).
  • Integrates protein identification via mass spectrometry (MS).
  • Employs prefractionation techniques for enhanced detection of low-abundance proteins.

    • Main Results:

    • 2-DE with IPGs resolves over 5000 proteins, routinely quantifying around 2000.
    • Detects and quantifies proteins at levels below 1 ng per spot.
    • IPGs enable separation of very acidic and alkaline proteins across a pH range of 2.5 to 12.
    • Narrow pH range IPGs offer high resolution (delta pI = 0.001).

    Conclusions:

    • 2-DE with IPGs and MS is a robust and versatile platform for plant proteome analysis.
    • This technology overcomes previous limitations, offering improved resolution and reproducibility.
    • The protocol facilitates detailed investigation of plant protein expression and modifications.