Ph Dependent Oligomerization
Ph Dependent 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.
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.
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.
08:21
A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions
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Cited by 4 •
2016
We describe a simple method for producing highly stable oligomeric clusters of gold nanoparticles via the reduction of chloroauric acid (HAuCl4) with sodium thiocyanate (NaSCN). The oligoclusters have a narrow size distribution and can be produced with a wide range of sizes and surface coats.
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
A change in acidity can add or remove protons from ionizable groups on the monomer. That shift changes the molecule’s charge and therefore modifies electrostatic attraction or repulsion, hydrogen bonding, and hydrophobic interactions. The combined interaction changes determine whether monomers favor remaining dispersed or associating into oligomers, making protonation state a central chemical control point.
Oligomer stability reflects the combined effects of charge-based forces, hydrogen bonding, and hydrophobic interactions rather than a single interaction alone. A pH shift can strengthen one contribution while weakening another, producing a different net tendency toward association. Examining this balance helps explain why small acidity changes can alter both assembly and disassembly.
Reversibility follows from the shifting equilibrium between dispersed monomers and associated oligomers. When pH changes, protonation-dependent interactions also change, allowing the preferred state to move toward association or dissociation. This behavior is important because it permits assemblies to respond repeatedly to solution acidity instead of remaining permanently locked in one structural state.
The outcome depends on how the pH change affects the molecular interactions that support association. Altered charge can increase attraction or repulsion, while changes in hydrogen bonding and hydrophobic interactions may stabilize or destabilize contact between monomers. The resulting balance determines whether oligomer formation is favored and whether the assemblies become more or less stable.
A conceptual study varies solution acidity and compares the molecular state under those conditions. Researchers can evaluate whether monomers remain dispersed or form oligomers, then assess how assembly size or stability changes as pH shifts. Comparing multiple acidity conditions reveals the direction and reversibility of the response without treating one solution condition as universally representative.
Changes in oligomer size and stability show how strongly molecular self-assembly responds to acidity. A condition that favors association may produce more persistent assemblies, whereas another may favor dispersed monomers or less stable oligomers. These observations help connect solution conditions with equilibrium behavior and identify conditions suitable for controlling aggregate properties.
This behavior provides a chemical basis for responsive materials, supramolecular systems, and processes designed to assemble or disassemble under defined environmental conditions. Because acidity can regulate molecular interactions, researchers can use pH as a control variable when studying self-assembly or designing systems whose aggregate size and stability change with their surroundings.