Protein Oligomerization Detection
Protein Oligomerization Detection - Related Videos
04:48
Fluorescence Fluctuation Spectroscopy to Study Protein Homo-Oligomerization
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2025
This video demonstrates the technique of fluorescence fluctuation spectroscopy (FFS) to study protein homo-oligomerization. Fluorescently-labeled proteins in a sample are dimerized using an agent when studying protein oligomerization using FFS. Using a confocal microscope, as the proteins move in and out of the small observation volume, the analysis of the fluctuations in the brightness of the fluorescent molecules is performed to determine the oligomeric state of the proteins.
12:43
Genetic and Biochemical Approaches for In Vivo and In Vitro Assessment of Protein Oligomerization: The Ryanodine Receptor Case Study
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Cited by 3 •
2016
Oligomerization of the ryanodine receptor, a homo-tetrameric ion channel mediating Ca2+ release from intracellular stores, is critical for skeletal and cardiac muscle contraction. Here, we present complementary in vivo and in vitro methods to detect protein self-association and determine homo-oligomer stoichiometry.
09:00
Detection of Protein Ubiquitination
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Cited by 96 •
2009
Ubiquitination is a key posttranslational modification carried out by a set of three enzymes. Mutations of genes involved in this modification are associated with many different human diseases. Here, we describe protocols to detect protein ubiquitination in cultured cells in vivo and test tubes in vitro.
08:16
Stereotaxic Infusion of Oligomeric Amyloid-beta into the Mouse Hippocampus
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Cited by 41 •
2015
Here, we present a protocol for direct stereotaxic brain infusion of amyloid-beta. This methodology provides an alternative in vivo mouse model to address the short-term effects of amyloid-beta on brain neurons.
03:41
Fluorescence Anisotropy-Based Detection of Protein-Protein Interactions
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2025
In this video, we describe the fluorescence anisotropy technique to study the interactions between the fluorophore-tagged Shwachman-diamond syndrome (SBDS) protein and the elongation factor-like 1 GTPase (EFL1). On incubating SBDS proteins with gradually increasing concentrations of EFL1, a steady increase in anisotropy is observed, indicating a successful interaction between the two proteins.
FAQs
These readouts provide complementary evidence rather than a single universal measurement. Molecular mass and hydrodynamic size help assess whether an assembly differs from an individual protein, whereas proximity and energy-transfer signals report association-related changes between molecules. Considering multiple readouts can strengthen interpretation of a proposed dimer, trimer, or larger assembly.
These methods examine different consequences of association. Native gel electrophoresis can reveal changes in migration, size-exclusion chromatography compares behavior related to hydrodynamic size, and analytical ultracentrifugation evaluates assemblies through their sedimentation behavior. Because each method emphasizes a different physical property, agreement among them can provide more informative evidence for oligomeric state than reliance on one measurement alone.
Cross-linking and fluorescence-based assays address association from different measurement angles. Cross-linking can preserve or capture protein molecules that are associated, while fluorescence approaches can monitor proximity or energy-transfer changes linked to molecular association. These methods are especially useful when the relevant evidence is an interaction-related change rather than only an apparent shift in mass or hydrodynamic size.
Testing mutations or compounds adds a causal dimension to oligomerization studies. If an alteration changes the observed oligomeric state, it can connect a protein sequence or chemical treatment with assembly stability or disruption. This strategy supports comparisons of specific states and helps evaluate whether oligomer formation may be relevant to activity, signaling, trafficking, or aggregation.
A practical workflow begins with a purified protein and a defined question about its assembly state. Researchers can examine the sample with a separation or physical-behavior method, such as native gel electrophoresis, size-exclusion chromatography, or analytical ultracentrifugation, then use cross-linking or fluorescence-based measurements as complementary evidence. Comparing results helps characterize the protein and validate the proposed oligomeric state.
In biology, the key application is linking assembly state to protein function and disease-related behavior. Measurements can be used to examine effects on enzymatic activity, receptor signaling, trafficking, and aggregation, while also supporting structural-model validation. The same approach helps compare mutations or compounds that stabilize or disrupt oligomers, making assembly a measurable variable in mechanistic studies.