Protein Loading Dye
Protein Loading Dye - Related Videos
06:47
Retrograde Loading of Nerves, Tracts, and Spinal Roots with Fluorescent Dyes
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Cited by 5 •
2012
We describe a simple and low cost technique for introducing high concentration of fluorescent and calcium-sensitive dyes into neurons or any neuronal tract using a polyethylene suction pipette.
09:32
Direct Imaging of ER Calcium with Targeted-Esterase Induced Dye Loading (TED)
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Cited by 60 •
2013
Targeted-esterase induced dye loading (TED) supports the analysis of intracellular calcium store dynamics by fluorescence imaging. The method bases on targeting of a recombinant Carboxylesterase to the endoplasmic reticulum (ER), where it improves the local unmasking of synthetic low-affinity Ca2+ indicator dyes in the ER lumen.
06:48
Antibody Labeling with Fluorescent Dyes Using Magnetic Protein A and Protein G Beads
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Cited by 3 •
2016
The on-bead method for labeling antibodies with small molecules enables labeling of a small amount of antibodies directly from cell media. This method is compatible with amine and thiol chemistry, and can handle multiple samples in parallel, manually or using automated platforms.
02:43
Microelectrode-Mediated FM Dye Loading and Unloading in Drosophila Larvae Nerve Cells
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2025
In this video, Drosophila larvae nerve fibers are immersed in FM dye, which binds to cell membrane lipids. Suction microelectrode and electrical pulses stimulate the endocytosis process, incorporating the FM dye into newly formed endocytic vesicles. This method, which visualizes presynaptic stages of neurotransmission, is useful for studying synaptic function and neurotransmitter release.
06:01
A Dye Release Assay to Quantify Enzymatic Activity of Antimicrobial Proteins
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2025
This video demonstrates the dye release assay for quantifying the enzymatic activity of antimicrobial proteins. The antimicrobial protein degrades the bacteria's dye-labeled cell wall and releases the dye molecules turning the solution blue. The absorbance of the solution correlates with the enzymatic activity of the antimicrobial protein.
FAQs
Glycerol or a similar density-increasing component makes the prepared protein sample denser than the surrounding electrophoresis buffer. This helps the sample move into and remain within the well instead of dispersing across the buffer surface. Consistent loading supports clearer comparisons among lanes, particularly when analyzing several protein extracts in the same SDS-PAGE experiment.
SDS and a reducing agent support denaturation before electrophoresis, while heating with the mixture helps promote that preparation. The resulting treatment makes protein samples more consistent for separation by size during SDS-PAGE. This is important when differences between samples should reflect their protein contents rather than inconsistent preparation or migration behavior.
Bromophenol blue serves as a tracking dye in the loading mixture. Its movement provides a visible indication of sample migration during electrophoresis, allowing the progress of the run to be monitored without directly viewing the proteins. This visual cue helps researchers judge when separation has advanced sufficiently for the intended analysis.
Researchers add the dye mixture to protein extracts before loading them into the gel wells. When the formulation includes SDS and a reducing agent, the mixture is heated to denature the proteins and promote consistent separation by size. The density component then helps the prepared extract enter the wells, while the tracking dye makes migration visible.
In genetics experiments, matched preparation with the dye allows protein extracts from mutant and wild-type samples to be compared by SDS-PAGE. The resulting separation can help researchers examine differences among gene-expression products at the protein level. Consistent treatment is especially valuable when interpreting whether observed lane patterns correspond to the genetic change under study.
After protein extracts receive the loading mixture and undergo electrophoresis, the separated proteins can support immunoblotting or other downstream assays. The dye promotes sample entry, visible tracking, and consistent size-based separation, creating an organized protein pattern for subsequent analysis. In this way, preparation links extract handling to interpretation of gene-expression products.