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Two-dimensional gel electrophoresis.

S Harper1, J Mozdzanowski, D Speicher

  • 1The Wistar Institute, Philadelphia, Pennsylvania, USA.

Current Protocols in Cell Biology
|January 30, 2008
PubMed
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Two-dimensional gel electrophoresis (2D-PAGE) separates proteins by charge and size, resolving thousands of proteins. This unit details methods for characterizing cell lysates using 2D-PAGE, including sample preparation and database utilization.

Area of Science:

  • Proteomics
  • Biochemistry
  • Molecular Biology

Background:

  • One-dimensional SDS-PAGE separates proteins solely by molecular weight.
  • Two-dimensional gel electrophoresis (2D-PAGE) offers enhanced protein resolution by separating proteins based on isoelectric point (charge) in the first dimension and molecular weight (size) in the second dimension.
  • Sensitive detection methods enable 2D-PAGE to resolve 1000 to 2000 distinct proteins.

Purpose of the Study:

  • To describe comprehensive methods for characterizing cell lysates using 2D-PAGE.
  • To provide protocols for various modifications and sample preparations for enhanced protein separation and analysis.
  • To guide researchers in utilizing 2D protein databases for data interpretation.

Main Methods:

  • Two-dimensional gel electrophoresis (2D-PAGE) involving isoelectric focusing (IEF) followed by SDS-PAGE.

Related Experiment Videos

  • Modifications for analyzing acidic and basic proteins.
  • Utilizing immobilized pH gradients (IPGs) for precise first-dimension separation.
  • Performing nonreducing and reducing electrophoretic separations.
  • Support protocols for gel casting, sample preparation, molecular weight standard preparation, and pH profiling.

    • Main Results:

    • Detailed methodologies for performing 2D-PAGE on cell lysates are presented.
    • Optimized protocols for handling diverse protein types (acidic, basic) and conditions (reducing/nonreducing) are described.
    • The capability of resolving 1000-2000 proteins with sensitive detection is highlighted.

    Conclusions:

    • 2D-PAGE is a powerful technique for high-resolution protein separation and characterization of complex biological samples like cell lysates.
    • The described methods and protocols facilitate robust and versatile proteomic analysis.
    • Integration with protein databases aids in the identification and interpretation of separated protein spots.