Highly Insoluble Aggregates
Highly Insoluble Aggregates - Related Videos
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.
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.
09:27
Sequential Extraction of Soluble and Insoluble Alpha-Synuclein from Parkinsonian Brains
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Cited by 46 •
2016
Here, we present a protocol for the isolation of increasingly insoluble/aggregated alpha-synuclein (α-syn) from post-mortem human brain tissue. Through the utilization of buffers with increasing detergent strength and high-speed ultracentrifugation techniques, the variable properties of α-syn aggregation in diseased and non-diseased tissue can be examined.
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.
FAQs
Exposed hydrophobic regions can increase attraction between otherwise soluble biomolecules, encouraging intermolecular association. As these contacts accumulate, molecules may undergo structural transitions that stabilize increasingly dense assemblies. This mechanism links changes in protein conformation to aggregate formation and helps explain why altered molecular surfaces can promote persistent deposits under aqueous cellular conditions.
Structural transitions can convert loosely associated molecules into assemblies stabilized by tightly organized or amorphous packing. That packing reduces molecular accessibility and makes the deposits more resistant to dissolution. The distinction matters experimentally because aggregate structure influences how readily biochemical extraction can recover material and how clearly microscopy or aggregation assays can detect it.
Dense packing can limit the accessibility of aggregate components to cellular clearance systems. When molecules become tightly organized or form compact amorphous deposits, the systems responsible for handling abnormal material may have reduced access to them. This provides a mechanistic connection between aggregate architecture, persistence inside cells, and the cellular stress associated with protein quality-control demands.
Aggregation can alter protein function by removing molecules from their normally soluble state and incorporating them into dense deposits. The resulting change in molecular availability may accompany cellular stress and broader disturbances in protein quality control. Studying these effects allows researchers to connect structural changes at the molecular level with functional consequences in biological systems.
Biochemical extraction is used to test how readily aggregate material can be recovered from biological samples under aqueous conditions. Because these assemblies resist dissolution, extraction behavior provides information about their insolubility and accessibility. Researchers can compare recovered material with observations from other approaches, helping characterize the biochemical properties of the deposits rather than relying on a single measurement.
Microscopy provides a way to observe aggregate-related deposits and examine their appearance in biological contexts, whereas aggregation assays provide a measurement framework for tracking or characterizing aggregation behavior. Used together, these approaches connect visible cellular or molecular patterns with assay-based evidence, strengthening interpretation of how aggregates form and persist.
These aggregates are relevant because their formation, persistence, and reduced accessibility can reveal weaknesses or demands within cellular protein quality-control systems. Characterizing them helps researchers relate molecular structure to cellular stress and disease mechanisms. The same information can guide investigation of therapeutic strategies intended to address aggregation-related changes in protein function or cellular handling.