Sds-insoluble Conformers
Sds-insoluble Conformers - Related Videos
01:20
Conformity
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2020
Conformity is the change in a person’s behavior to go along with the group, even if that person does not agree with the group. Asch’s Original Study Solomon Asch conducted several experiments in the 1950s to determine how people are affected by the thoughts and behaviors of other people. In one study, a group of participants was shown a series of printed line segments of different lengths: a, b, and c. Participants were then shown a fourth line segment: x. They were asked to identify which...
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.
07:29
Separating Protein with SDS-PAGE
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2023
Sodium Dodecyl Sulfate Poly-Acrylamide Gel Electrophoresis, or SDS-PAGE, is a widely-used technique for separating mixtures of proteins based on their size and nothing else. SDS, an anionic detergent, is used to produce an even charge across the length of proteins that have been linearized. By first loading them into a gel made of polyacrylamide and then applying an electric field to the gel, SDS-coated proteins are then separated. The electric field acts as the driving force, drawing the SDS...
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.
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.
FAQs
Their resistance arises from unusually stable intermolecular contacts within misfolded assemblies. Extensive associations between polypeptides, together with ordered beta-sheet structure, can maintain the aggregate even when SDS is present. As a result, these assemblies do not disperse efficiently during detergent extraction and remain detectable in the material recovered as the insoluble fraction.
Ordered beta-sheet structure can support close, repeated interactions among neighboring polypeptides, strengthening the assembled state. When combined with extensive intermolecular contacts, this organization helps explain why some aggregates withstand SDS treatment more effectively than less stable protein assemblies. Studying this structural feature connects detergent resistance with the physical stability of misfolded protein states.
Detergent-soluble states are disrupted or retained in the soluble material during SDS-based extraction, whereas the resistant assemblies remain associated and are recovered separately. This distinction provides an operational way to compare protein states without relying only on their original folding history. The contrast is especially useful when assessing whether altered folding has produced stable aggregation.
A typical analysis exposes the protein sample to SDS, separates soluble material from retained material by centrifugation, and examines the resulting fractions. The material that remains after detergent extraction is then analyzed to assess its presence and properties. Comparing these fractions allows investigators to determine whether aggregation has generated a detergent-resistant species.
The abundance of retained material provides an estimate of how much protein exists in detergent-resistant assemblies under the tested conditions. An increased amount can indicate greater accumulation of stable aggregates, while the properties of that material offer additional information about the associated protein state. Interpretation should therefore consider both quantity and the characteristics of the retained fraction.
These species provide experimental markers for examining altered protein folding and the formation of stable aggregates in biological systems. Their detection can support studies of amyloid formation and prion-like propagation, while changes in their abundance or properties can help investigate aggregation mechanisms associated with neurodegenerative disease. Thus, detergent resistance links biochemical analysis with disease-related protein biology.