Urea Gradient Gel
Urea Gradient Gel - Related Videos
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.
10:52
Denaturing Gradient Gel Electrophoresis (DGGE)
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Cited by 10 •
2007
05:34
Denaturing Urea Polyacrylamide Gel Electrophoresis for RNA Analysis: A Technique to Separate Fluorescently Labeled Phosphorylated RNA Oligonucleotides from their Non-Phosphorylated Equivalents
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2025
In this video, we demonstrate a denaturing polyacrylamide gel electrophoresis for the separation of phosphorylated RNA species from their non-phosphorylated counterparts. The RNA species are fluorescently labeled for laser detection on the gel.
01:23
Urea Cycle
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2025
The urea cycle describes how liver cells convert ammonia to urea. Ammonia is a toxic waste product of protein catabolism. Land animals must convert ammonia into the less toxic urea which can be safely eliminated by the kidneys through urine. Marine animals excrete ammonia directly, and the surrounding water dilutes the ammonia to safe levels. There are five basic steps in the urea cycle: the conversion of ammonia (NH3) to carbamoyl phosphate the introduction of ornithine in the...
07:52
Removal of Branched and Cyclic Compounds by Urea Adduction for Uk'37 Paleothermometry
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2023
Source: Laboratory of Jeff Salacup - University of Massachusetts Amherst As mentioned in previous videos, the product of an organic solvent extraction, a total lipid extract (TLE), is often a complex mixture of hundreds, if not thousands, of different compounds. The researcher is often only interested in a handful of compounds. In the case of our two organic paleothermometers (Uk'37 and MBT/CBT), the interest is in only 6 compounds (2 alkenones and 4 isoprenoidal glycerol dialkyl glycerol...
FAQs
Urea changes migration by progressively weakening the noncovalent interactions that maintain protein conformation. As a protein encounters higher concentrations, it can shift from a folded state toward an unfolded state, and that structural change alters how it moves through the polyacrylamide network. The resulting position or pattern reports how mobility changes as chemical denaturation increases.
The continuous gradient can reveal transitions that a single denaturant condition might not distinguish. A protein that retains a folded conformation longer will show a different migration response from one that unfolds earlier, allowing relative stability to be compared. Interpreting these patterns centers on the relationship between urea concentration, conformational state, and electrophoretic mobility.
Mutations, ligands, and environmental conditions can shift the migration pattern by changing how readily a protein loses its conformation in urea. Comparing otherwise corresponding samples helps determine whether a change stabilizes or destabilizes the protein, or alters its conformational transition. This makes the method useful for connecting sequence or molecular interactions with structural behavior.
An experiment begins with a polyacrylamide gel containing a continuous increase in urea concentration. Protein samples are introduced and subjected to electrophoresis so they travel through progressively stronger denaturing conditions. After migration, researchers compare the resulting patterns across samples, relating their positions to changes in conformation and using those differences to assess folding behavior.
The essential experimental components are protein samples, a polyacrylamide gel, a urea gradient, and an electrophoresis setup. The gradient provides a spatial increase in denaturant, so a migrating protein experiences changing chemical conditions rather than one fixed urea level. Together, these components create the controlled comparison needed to examine mobility during progressive disruption of protein structure.
In biology and biochemistry, Urea Gradient Gel supports investigations of protein folding, conformational transitions, and molecular stability. Researchers can compare related proteins or experimental conditions when the key outcome is a migration pattern linked to folded or unfolded states. The approach is especially informative for examining effects associated with mutations, ligands, or environmental conditions.