Protein Separation
Protein Separation - Related Videos
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...
08:17
Electrophoretic Separation of Proteins
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Cited by 29 •
2008
In this video, we demonstrate a method for electrophoretic separation of proteins using poly-acrylimide gel electrophoresis (PAGE).
06:59
Multimer-PAGE for Separating Native Protein Complexes: A Hybrid Separation Technique Consisting of Blue Native-PAGE and SDS-PAGE to Separate Intact Multimeric Proteins From Tissue Lysate
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2025
This video describes multimeric PAGE for separating native protein complexes from tissue homogenates. The technique is a hybrid of blue native-PAGE and SDS-PAGE techniques. The separated complexes can be characterized and studied for their role in cell functioning.
04:38
Protein Phase Separation Assay: An Optogenetic Method for Mutant RNA-Binding Protein Phase Separation in Spinal Motor Neurons of Zebrafish Larvae
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2025
In this video, we describe a phase separation assay, wherein intracellular proteins comprising intrinsically disordered regions fused to a photosensitive oligomerization domain are induced via blue-light exposure to self-associate into membrane-less liquid-like condensates.
06:14
Separation and Fractionation of Cell Wall and Cell Membrane Proteins from Mycobacterium tuberculosis for Downstream Protein Analysis
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2025
This protocol separates insoluble cell wall and membrane proteins into simple fractions (1-5 proteins) using preparative isoelectric focusing (IEF) based on isoelectric point, followed by separation by molecular weight. The resulting fractions can be used directly for immunological and proteomic analysis without further purification.
FAQs
Method selection depends on the property contrast that best distinguishes the target protein from accompanying molecules. Size, charge, solubility, and molecular affinity provide different separation bases. A size-based approach addresses one kind of mixture, whereas affinity relies on differing molecular interactions. Matching the property to the biological sample improves isolation and supports meaningful downstream analysis.
The stationary phase provides the surface or material with which proteins interact during chromatography. Proteins move differently because their interactions with this phase are not identical, allowing them to emerge as separated components rather than as one mixture. This behavior makes chromatography useful when researchers need protein purification for biochemical experiments or further characterization.
Electrophoresis resolves proteins through differences in electrical charge and molecular size. These properties influence how individual proteins separate within the electrophoretic system, producing distinguishable components from a complex sample. Unlike chromatography, which emphasizes interactions with a stationary phase, electrophoresis is especially useful for assessing protein patterns and evaluating the composition of biological samples.
Solubility and molecular affinity offer complementary ways to distinguish proteins that may not be adequately resolved by a single property. Differences in solubility can help separate components according to how readily they remain in a mixture, while affinity reflects selective molecular interactions. Using these characteristics supports more effective purification and improves the quality of subsequent protein studies.
A practical workflow begins with a complex biological mixture, identifies the property most useful for distinguishing its proteins, and applies a suitable separation method such as chromatography or electrophoresis. The resulting fractions or patterns can then undergo identification, quantification, or functional study. This sequence connects physical separation with interpretable biological evidence.
Researchers use separated protein samples when they need to examine an enzyme without the full complexity of its original biological mixture. Isolation supports biochemical experiments and enzyme characterization by making the relevant protein fraction more accessible for study. Separation also contributes to quality assessment, helping researchers evaluate whether a preparation is suitable for downstream analysis.
Separating proteins from cellular mixtures helps researchers examine which protein components are present and compare their abundance. Electrophoresis can resolve patterns based on charge and size, while chromatography can support isolation and purification. These outputs improve downstream identification and quantification, making separation relevant to studies of cellular protein expression in biology.