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Updated: Jul 5, 2026
10:52
Denaturing Gradient Gel Electrophoresis (DGGE)
Published on: February 25, 2007
Diagonal gel electrophoresis
1National Institute of Child Health and Human Development, Bethesda, Maryland, USA.
Current Protocols in Immunology
|April 25, 2008
Summary
Diagonal gel electrophoresis separates protein subunits linked by disulfide bonds. This two-dimensional technique resolves individual subunits below the diagonal, aiding in the analysis of multisubunit protein composition.
Area of Science:
- Biochemistry
- Molecular Biology
- Proteomics
Background:
- Multisubunit proteins are crucial in biological processes.
- Understanding protein subunit composition is essential for elucidating protein function.
- Interchain disulfide bonds play a role in stabilizing protein quaternary structure.
Purpose of the Study:
- To introduce and describe diagonal gel electrophoresis as a method.
- To demonstrate its utility in analyzing proteins with interchain disulfide bonds.
- To differentiate disulfide-linked proteins from non-disulfide-linked proteins.
Main Methods:
- Two-dimensional gel electrophoresis under nonreducing and reducing conditions.
- First dimension: electrophoresis under nonreducing conditions.
- Second dimension: reduction within the gel followed by electrophoresis at a right angle.
Main Results:
- Proteins without disulfide bonds migrate along the diagonal.
- Proteins with interchain disulfide bonds resolve below the diagonal upon reduction.
- Separated subunits migrate faster than the intact disulfide-linked complex in the second dimension.
Conclusions:
- Diagonal gel electrophoresis is effective for determining the subunit composition of proteins linked by disulfide bonds.
- The method allows for the identification of disulfide-linked protein complexes.
- This technique provides valuable insights into protein structure and assembly.
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