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Two-Dimensional Gel Electrophoresis with Immobilized pH Gradients

Bre'Ana Byrd1,2,3, Huyen Tran4,5,6

  • 1Endocrinology Section, Department of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA. bbyrd4@uco.edu.

Methods in Molecular Biology (Clifton, N.J.)
|November 15, 2018
PubMed

Insights

Isoelectric focusing (IEF) separates proteins by charge using immobilized pH gradients (IPG). This method, combined with SDS-PAGE, creates a detailed two-dimensional map of serum proteins for analysis.

Area of Science:

  • Biochemistry
  • Proteomics
  • Analytical Chemistry

Background:

  • Isoelectric focusing (IEF) has been a staple in protein research since 1975 for separating proteins based on their isoelectric point.
  • IEF, when coupled with sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE), enables high-resolution separation of cellular proteins for analytical applications.
  • Traditional IEF methods utilize carrier ampholytes to establish pH gradients, or employ immobilized pH gradients (IPG) with covalently bound ampholytes.

Purpose of the Study:

  • To describe a novel isoelectric focusing system utilizing immobilized pH gradient (IPG) strips.
  • To demonstrate the application of this IEF system for the separation of serum proteins.
  • To generate a two-dimensional protein map through a combination of IEF and SDS-PAGE.

Main Methods:

  • Utilized immobilized pH gradient (IPG) strips for the first-dimension separation of proteins based on charge.
  • Applied specific current and voltage settings to the IPG strips during the isoelectric focusing process.
  • Performed SDS-PAGE as the second-dimension separation technique to generate a two-dimensional protein map.

Main Results:

  • Successfully separated proteins based on their isoelectric point using IPG strips.
  • Generated a two-dimensional map of serum proteins by combining IPG-based IEF with SDS-PAGE.
  • The described IEF system facilitates high-resolution protein separation.

Conclusions:

  • The described IEF system employing immobilized pH gradient (IPG) strips offers an effective method for protein separation.
  • This technique, when integrated with SDS-PAGE, provides a powerful tool for generating comprehensive two-dimensional maps of serum proteins.
  • The system enhances analytical capabilities in proteomics and biochemical research.

Keywords:
High resolutionImmobilized pH gradientsIsoelectric focusingTwo-dimensional electrophoresis

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