Protein Oligomerization
Protein Oligomerization - 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.
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.
06:45
Transmembrane Domain Oligomerization Propensity determined by ToxR Assay
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Cited by 7 •
2011
An efficient procedure to assess the oligomerization propensity of single-pass transmembrane domains (TMDs) is described. Chimeric proteins consisting of the TMD fused to ToxR are expressed in an E. coli reporter strain. TMD-induced oligomerization causes dimerization of ToxR, activation of transcription and production of the reporter protein, -galactosidase.
04:41
Preparation of Oligomeric β-amyloid1-42 and Induction of Synaptic Plasticity Impairment on Hippocampal Slices
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Cited by 74 •
2010
One feature of Alzheimer's Disease is the elevation of Aβ1-42 peptide. Here we provide a protocol for preparing synthetic Aβ1-42 oligomers, which impairs hippocampal Long-Term Potentiation, a cellular correlate of memory. This procedure is useful for investigating mechanisms of Aβ-induced pathology and drug screening.
FAQs
Protein oligomerization depends on molecular complementarity: contacting surfaces fit well enough for hydrophobic effects, hydrogen bonds, ionic forces, and sometimes covalent disulfide bonds to stabilize association. The balance among these interactions influences whether subunits form a defined complex and how stable that complex remains. This mechanism links molecular contact directly to the structural organization of the protein assembly.
Homomeric assemblies contain repeated copies of the same protein, whereas heteromeric assemblies combine different protein subunits. This distinction affects which complementary surfaces can interact and may produce different structural or functional outcomes. Identifying the subunit type therefore helps explain how a complex is organized and how its composition contributes to biological activity.
Reversible oligomerization allows protein subunits to associate and separate rather than remaining permanently assembled. That flexibility can connect complex formation with changes in protein function, including regulation of enzyme activity, receptor signaling, or transport. By contrast, a more stable oligomer can maintain a persistent structural or functional assembly within a biological system.
Oligomeric assemblies can influence several distinct biological processes, including enzyme activity, receptor signaling, transport, and the formation of structural assemblies. The consequences depend on the proteins involved and on how their subunits associate. Consequently, studying oligomerization provides a way to connect protein-level assembly with broader cellular organization and function.
A useful analysis considers the complex’s subunit composition, the interactions holding its surfaces together, and whether the assembly is reversible or stable. Researchers can then relate those properties to structural organization and biological function. This framework helps distinguish different oligomeric states and clarifies how changes in assembly may alter cellular processes.
Altered protein assembly can contribute to protein aggregation and disease, making oligomerization relevant beyond normal cellular biology. Comparing normal complexes with incorrectly assembled or aggregated forms can help clarify how molecular organization changes biological behavior. Because assembly can influence function, oligomerization also represents a potential target for therapeutic strategies aimed at modifying harmful protein interactions.