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Related Experiment Videos

Two-dimensional difference gel electrophoresis.

Surya Viswanathan1, Mustafa Unlü, Jonathan S Minden

  • 1Department of Biological Science, Carnegie Mellon University, Mellon Institute, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, USA.

Nature Protocols
|April 5, 2007
PubMed
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Two-dimensional difference gel electrophoresis (2D DIGE) offers a sensitive method to compare protein samples. This technique enhances proteome variation analysis by using fluorescent dyes for accurate protein difference detection.

Area of Science:

  • Proteomics
  • Biochemistry
  • Analytical Chemistry

Background:

  • Traditional 2D electrophoresis (2DE) has limitations in direct sample comparison.
  • Simultaneous analysis of multiple protein samples is crucial for accurate differential proteomics.

Purpose of the Study:

  • To present a protocol for Two-dimensional difference gel electrophoresis (2D DIGE).
  • To highlight the advantages of 2D DIGE for quantitative proteome analysis.

Main Methods:

  • Proteins are labeled with distinct fluorescent dyes (e.g., Cy3, Cy5, Cy7).
  • Labeled samples are co-electrophoresed on the same 2D gel.
  • Differential fluorescence ratios reveal protein abundance changes.

Main Results:

Related Experiment Videos

  • 2D DIGE enables detection of as little as 0.5 fmol of protein.
  • Reliable quantification of protein differences down to +/- 15% is achievable.
  • The method covers a wide protein concentration range (>10,000-fold).

Conclusions:

  • 2D DIGE significantly improves the statistical assessment of proteome variation.
  • This technique offers enhanced sensitivity and accuracy for comparative proteomics.
  • The described protocol facilitates efficient 2D DIGE experiment execution within 2-3 days.