Denaturing Gel Electrophoresis
Denaturing Gel Electrophoresis - Related Videos
10:52
Denaturing Gradient Gel Electrophoresis (DGGE)
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Cited by 10 •
2007
08:44
Denaturing Urea Polyacrylamide Gel Electrophoresis (Urea PAGE)
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Cited by 104 •
2009
Denaturing urea polyacrylamide gel electrophoresis is used to separate single-stranded DNA or RNA up to a limit of 500 nucleotides. Urea in combination with heat denatures samples and unstructured single strands migrate within the gel matrix according to their molecular weight.
10:03
Screening for Amyloid Aggregation by Semi-Denaturing Detergent-Agarose Gel Electrophoresis
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Cited by 187 •
2008
SDD-AGE is a useful technique for the detection and characterization of amyloid-like polymers in cells. Here we demonstrate an adaptation that makes this technique amenable to large-scale applications.
08:55
Characterization of Multi-subunit Protein Complexes of Human MxA Using Non-denaturing Polyacrylamide Gel-electrophoresis
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Cited by 3 •
2016
This article describes a simple and rapid protocol to evaluate the oligomeric state of the dynamin-like GTPase MxA protein from lysates of human cells using a combination of non-denaturing PAGE with western blot analysis.
07:31
Two-Dimensional Gel Electrophoresis
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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...
FAQs
SDS treatment unfolds polypeptides and helps place them on a similar negative charge-to-mass basis. This reduces the influence of each protein’s native structure and intrinsic charge during migration. As a result, differences in movement through the gel more directly reflect molecular size, supporting molecular-weight estimation and comparisons among protein samples.
The polyacrylamide gel provides a porous path that acts as a size-dependent barrier. When the electric field drives negatively charged molecules through this network, smaller molecules move more readily and therefore migrate faster than larger ones. This differential movement creates separated positions that can be related to molecular size.
Unlike an analysis that preserves native structure, denaturing conditions reduce the contributions of three-dimensional shape and unequal intrinsic charge. For proteins, detergent treatment also makes charge-to-mass ratios more similar. The resulting pattern is therefore more size-focused, whereas structure- or charge-dependent behavior is less prominent during migration.
For nucleic acids, chemical treatment and electrophoretic separation are used under conditions intended to minimize the effects of molecular shape and charge. Fragment movement can consequently be interpreted primarily in relation to size rather than native conformation. This extends the technique beyond protein analysis to molecular biology studies involving nucleic acid fragments.
A basic workflow starts by chemically treating the sample to reduce native structural effects. The prepared material is placed in a porous polyacrylamide gel, and an electric field is applied to drive the charged molecules through the matrix. After separation, migration positions are compared to assess relative size, estimate molecular weight for proteins, or examine fragment patterns.
Protein-focused runs can provide several complementary readouts. Migration patterns support molecular-weight estimation, while comparisons across samples can reveal differences in protein expression. The same analyses can also help assess sample purity. Together, these outcomes let investigators evaluate protein composition and compare biological or experimental samples.
Its value comes from converting molecular differences into a migration pattern that can be compared between samples. In biology, this supports protein and nucleic acid investigations; in biotechnology, it provides a basis for evaluating molecular size, sample purity, and expression differences. This shared logic makes it a foundational analytical method.