Insoluble Protein Detection
Insoluble Protein Detection - Related Videos
08:38
Protein Membrane Overlay Assay: A Protocol to Test Interaction Between Soluble and Insoluble Proteins in vitro
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Cited by 6 •
2011
Testing protein-protein interaction is indispensable for dissection of protein functionality. Here, we introduce an in vitro protein-protein binding assay to probe a membrane-immobilized protein with a soluble protein. This assay provides a reliable method to test interaction between an insoluble protein and a protein in solution.
09:35
Enrichment of Detergent-insoluble Protein Aggregates from Human Postmortem Brain
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Cited by 45 •
2017
An abbreviated fractionation protocol for the enrichment of detergent-insoluble protein aggregates from human postmortem brain is described.
05:36
Isolation of Detergent-Insoluble Protein Aggregates From Human Postmortem Brain Tissue
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2025
This video explains the process of isolating and enriching detergent-insoluble protein aggregates from frozen postmortem human brain tissue. It demonstrates key steps, including homogenization, detergent treatment, sonication, and ultracentrifugation to separate and purify the insoluble aggregates. The final step involves solubilizing the aggregates in urea buffer for further analysis.
12:03
Expression, Isolation, and Purification of Soluble and Insoluble Biotinylated Proteins for Nerve Tissue Regeneration
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Cited by 12 •
2014
Developing biotinylatable fusion proteins has many potential applications in various fields of research. Recombinant protein engineering is a straight forward procedure that is cost-effective, providing high yields of custom-designed proteins.
11:29
Isolation of Soluble and Insoluble PrP Oligomers in the Normal Human Brain
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Cited by 7 •
2012
A new species of cellular prion protein (PrPC) has recently been identified in uninfected human brains using the methods described here. These methods can be used to isolate various PrP species, while some of them are also useful in isolating other misfolded protein aggregates from human brains.
FAQs
A larger insoluble fraction can signal protein misfolding, aggregation, or association with membranes and complexes. Comparing the amount of a protein in soluble and insoluble fractions helps determine whether its distribution changes under a condition or after an experimental manipulation. This makes insolubility a useful indicator of altered protein handling within cells.
The method separates proteins according to their presence in soluble or retained insoluble material, rather than measuring only total cellular protein. A protein may therefore show a changed distribution between fractions even when its overall abundance is not the primary observation. Examining both fractions provides context for interpreting shifts in solubility and aggregation.
After insoluble material is retained, SDS-PAGE separates its proteins so their distribution can be examined. Staining provides a broader view of proteins present in the analyzed material, whereas immunoblotting focuses detection on a selected protein using an appropriate antibody-based assay. Together, these approaches can assess protein presence and changes in abundance within the insoluble fraction.
Researchers first extract cellular material under conditions that produce soluble and insoluble portions. Centrifugation then separates the insoluble material into a retained pellet and the soluble fraction into the corresponding liquid portion. The pellet is subsequently analyzed by SDS-PAGE, staining, or immunoblotting, allowing its protein content and changes to be examined.
Analysis of the retained material can show whether a protein is present in an insoluble fraction and whether its abundance changes between experimental samples. When results are considered alongside the soluble fraction, they can reveal altered solubility or increased aggregation. These outcomes support comparisons of protein behavior across cellular conditions or protein-expression experiments.
Insoluble protein detection is useful when researchers investigate protein folding, aggregation, cellular stress, disease mechanisms, or experimental protein expression. Fractionation followed by protein analysis connects a protein’s biochemical distribution with these biological contexts. The approach can therefore help identify changes in protein state that may not be apparent from examining cellular extracts without separating their fractions.