Two-dimensional Gel Electrophoresis
Two-dimensional Gel Electrophoresis - Related Videos
07:31
Two-Dimensional Gel Electrophoresis
0 Views •
2023
Two-dimensional gel electrophoresis (2DGE) is a technique that can resolve thousands of biomolecules from a mixture. This technique involves two distinct separation methods that have been coupled together: isoelectric focusing (IEF) and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). This physically separates compounds across two axes of a gel by their isoelectric points (an electrochemical property) and their molecular weights. The procedure in this video covers the main...
01:22
Two-dimensional Gel Electrophoresis
0 Views •
2023
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...
09:22
DNA Gel Electrophoresis
0 Views •
2023
DNA gel electrophoresis is a technique used for the detection and separation of DNA molecules. An electric field is applied to a gel matrix comprised of agarose, and within the gel, charge particles will migrate and separate based on size. The negatively charged phosphates of the DNA backbone cause DNA fragments to move toward the anode - a positively charged electrode. The video explains the mechanism by which DNA fragments are resolved on an agarose gel, and it provides a step-by-step...
10:52
Denaturing Gradient Gel Electrophoresis (DGGE)
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Cited by 10 •
2007
07:37
Two-Dimensional Polyacrylamide Gel Electrophoresis: A Separation Technique for Analysis of Proteins in Complex Protein Mixture Based on Charge and Molecular Weight
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2025
In this video, we demonstrate a two-dimensional gel electrophoresis method that separates individual proteins from a complex protein mixture obtained from tumor tissues of human nonfunctional pituitary adenoma (NFPA). The proteins are separated based on their electric charge in the first dimension and further separated based on molecular weights in the second dimension.
FAQs
The two separation stages provide complementary coordinates for each protein. Isoelectric focusing establishes a position based on isoelectric point, whereas SDS-polyacrylamide gel electrophoresis contributes a position based on molecular mass. Because these properties are independent, proteins that overlap in one dimension can become distinguishable in the combined spot pattern, improving analysis of complex biological mixtures.
The main comparison is between spot patterns from different biological samples or experimental conditions. Differences in spot abundance can identify proteins whose representation changes between those samples. The pattern can therefore support expression profiling and may highlight molecular changes associated with disease, development, or environmental responses, while preserving the broader context of the entire protein mixture.
Post-translational modifications are among the biological changes that this method can help investigate. Researchers can compare the resulting protein-spot patterns across samples or conditions and examine differences in composition or abundance. This makes the technique useful when a study asks whether protein-level changes accompany disease, development, or environmental responses.
A typical workflow begins by applying a protein mixture to the first separation dimension, isoelectric focusing. The focused material then undergoes SDS-polyacrylamide gel electrophoresis in the second dimension. Researchers inspect the resulting two-dimensional arrangement of protein spots and compare patterns among samples or experimental conditions.
It adds a second coordinate to the analysis after isoelectric focusing has separated proteins by isoelectric point. Using molecular mass in this stage helps resolve proteins that may share a similar position under the first criterion. The combined result is a more informative protein pattern for comparing complex biological samples.
Researchers use the technique when they need to compare protein composition across cells, tissues, or experimental conditions. Its results can support protein identification and expression profiling, as well as studies of post-translational modifications. In biology, these comparisons may help investigate changes associated with disease, development, or environmental responses.