Sequential Protein Extraction
Sequential Protein Extraction - Related Videos
07:41
Sequential Salt Extractions for the Analysis of Bulk Chromatin Binding Properties of Chromatin Modifying Complexes
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Cited by 20 •
2017
Sequential salt extraction of chromatin bound proteins is a useful tool for determining the binding properties of large protein complexes. This method can be employed to evaluate the role of individual subunits or domains in the overall affinity of a protein complex to bulk chromatin.
09:52
Electricity-Free, Sequential Nucleic Acid and Protein Isolation
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Cited by 4 •
2012
A tool and chemistries are described to sequentially isolate nucleic acids followed by proteins from a sample without the need for electricity. The tool consists of a sorbent held within a transfer pipette while the isolation chemistries are based on solid-phase extraction principles. The isolated macromolecules can be analyzed by immuno-based and PCR-based assays.
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.
01:58
Protein Extraction from Neuronal Cells
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2025
This protocol outlines the extraction of proteins from neuronal cancer cells. The cells are washed with a buffer and lysed via enzymatic and mechanical disruption. The extracted protein-rich supernatant is collected after centrifugation.
03:22
SDS-PAGE Based Extraction of Extracellular Vesicles Associated Proteins: A Procedure to Extract Proteins from EVs and Prepare Them for In-Gel Digestion
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2023
In this video, we demonstrate the SDS-PAGE in-gel digestion method for protein extraction from extracellular vesicles or EVs. Once isolated, the obtained protein fragments can be used for proteomic analysis.
FAQs
Each solution changes the chemical environment so proteins with different solubilities or structural associations are released at different stages. Mild conditions can recover more readily soluble proteins, whereas stronger solubilizing conditions access proteins associated with membranes or insoluble structures. This stepwise separation creates fractions that reflect biochemical associations rather than combining all proteins into one mixed sample.
The unextracted material retains proteins that were not solubilized under the preceding conditions. Processing this residue with the next solution preserves the sequence of selectivity and allows progressively less accessible protein pools to be recovered. Losing or combining the remainder would reduce the ability to distinguish proteins according to localization, membrane association, or resistance to solubilization.
A single solution produces a broader mixture of proteins and provides less information about their biochemical associations. Sequential protein extraction generates multiple fractions whose contents can be compared across extraction stages. That comparison helps determine whether a protein is primarily soluble, membrane-associated, or enriched in a detergent-resistant pool, rather than merely showing that the protein is present in the sample.
The workflow begins with a biological sample and applies an extraction solution under defined solubilizing conditions. The released material is collected as one fraction, while the remaining sample is subjected to the next, stronger solution. Repeating this sequence produces a series of protein pools that can be analyzed individually and compared with one another.
Electrophoresis can compare the protein patterns or apparent abundance across fractions, while mass spectrometry can characterize the proteins present in each pool. Examining the fractions separately links detected proteins to their extraction behavior. Differences between pools may therefore reveal changes in localization, aggregation, or other biochemical properties that would be obscured in a combined sample.
Brain and other neural tissues can be separated into soluble, membrane-associated, and detergent-resistant protein pools before downstream analysis. Researchers can then compare these fractions between experimental conditions or disease-related samples to investigate altered localization, aggregation, or post-translational changes. The approach is useful when the biological question concerns where proteins reside or how strongly they associate with neural structures.