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Related Concept Videos

Two-dimensional Gel Electrophoresis01:22

Two-dimensional Gel Electrophoresis

Two-dimensional gel electrophoresis is a high-resolution protein separation method first introduced by O' Farrell and Klose in 1975. This method involves protein separation by two dimensions, mass and charge, making it more accurate than one-dimensional gel electrophoresis.
The first dimension separation uses the isoelectric focusing or IEF technique performed on immobilized pH gradient (IPG) strips that separate proteins according to their isoelectric points.
Biological samples, such as  cells...
SDS-PAGE01:27

SDS-PAGE

Gel electrophoresis is a method that separates biological macromolecules like nucleic acids or proteins by forcing them to pass through a gel matrix under an electric field.
A variation of gel electrophoresis, termed  polyacrylamide gel electrophoresis (PAGE), is commonly used for separating proteins according to their molecular size by passing them through a polyacrylamide gel. Because of the varying charges associated with amino acid side chains, PAGE can be used to separate intact proteins...

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Two-dimensional Gel Electrophoresis Coupled with Mass Spectrometry Methods for an Analysis of Human Pituitary Adenoma Tissue Proteome
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Improved comparative proteome analysis based on two-dimensional gel electrophoresis.

Murat Eravci1,2, Sandra Fuxius1,2, Oliver Broedel2

  • 1Department of Radiology and Nuclear Medicine (Radiochemistry), Charité Universitätsmedizin, Campus Benjamin Franklin, Berlin, Germany.

Proteomics
|February 20, 2007
PubMed
Summary

New apparatuses improve two-dimensional electrophoresis (2D gel) reliability. This allows for accurate detection of protein differences in rat brain samples, even with small protein load variations.

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Consensus Brain-derived Protein, Extraction Protocol for the Study of Human and Murine Brain Proteome Using Both 2D-DIGE and Mini 2DE Immunoblotting
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Proteomic Profiling of Macrophages by 2D Electrophoresis
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Proteomic Profiling of Macrophages by 2D Electrophoresis

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Consensus Brain-derived Protein, Extraction Protocol for the Study of Human and Murine Brain Proteome Using Both 2D-DIGE and Mini 2DE Immunoblotting
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Proteomic Profiling of Macrophages by 2D Electrophoresis

Published on: November 4, 2014

Area of Science:

  • Proteomics
  • Biochemistry
  • Analytical Chemistry

Background:

  • Two-dimensional electrophoresis (2D gel) is a powerful technique for protein separation and analysis.
  • Variability between gels can hinder reliable detection of quantitative protein expression differences.
  • Optimizing gel processing is crucial for accurate proteomic studies.

Purpose of the Study:

  • To assess the reliability of detecting spot intensity differences in two-dimensional electrophoresis (2D gel) gels.
  • To evaluate the impact of improved apparatuses on between-gel variation and spot intensity analysis.
  • To determine the sensitivity of the method for detecting quantitative protein changes with varying protein loads.

Main Methods:

  • Utilized two-dimensional electrophoresis (2D gel) with ruthenium fluorescent stain on rat brain protein samples.
  • Compared protein loads of 200 microg and 250 microg initially, with unsatisfactory results.
  • Developed and implemented new apparatuses for simultaneous processing of up to 24 gels to reduce variation.

Main Results:

  • Initial experiments showed low detection rates for significant spot intensity differences (72 higher, 58 lower).
  • The new apparatus significantly reduced between-gel variation, enabling detection of significant differences in 77-90% of matched spots with a 25% protein load difference.
  • Over 90% of spots showed significant differences when a 50% protein load difference was applied.

Conclusions:

  • The improved apparatus significantly enhances the reliability and sensitivity of quantitative proteomics using 2D gel electrophoresis.
  • This method allows for robust detection of protein expression changes in biological samples.
  • The optimized protocol is effective for both individual biological replicates and pooled samples.