Protein Modulators
Protein Modulators - Related Videos
03:15
Screening of Cyclic di-GMP Modulators Using Bacteria Expressing a Fluorescent Reporter Protein
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2025
Source: Rugjee, K. N., et al. Establishment of a High-throughput Setup for Screening Small Molecules That Modulate c-di-GMP Signaling in Pseudomonas aeruginosa. J. Vis. Exp. (2016).This video demonstrates the screening of cyclic di-GMP modulators using genetically modified bacteria that express green fluorescent protein (GFP) under the control of a c-di-GMP-sensitive promoter. Fluorescence is measured in a multi-well plate containing different test compounds. Compounds that inhibit c-di-GMP...
10:59
Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors
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Cited by 5 •
2014
Optical biosensor techniques can detect changes in mass near the plasma membrane in living cells and allow one to follow cellular responses in both individual cells and populations of cells. This protocol will describe detection of the modulation of potassium channels by G-protein coupled receptors in intact cells using this approach.
14:44
A Protocol for the Identification of Protein-protein Interactions Based on 15N Metabolic Labeling, Immunoprecipitation, Quantitative Mass Spectrometry and Affinity Modulation
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Cited by 9 •
2012
We present a variation of the QUICK (QUantitative Immunoprecipitation Combined with Knockdown) approach that was introduced previously to distinguish between true and false protein-protein interactions. Our approach is based on 15N metabolic labeling, the modulation of affinities of protein-protein interactions by the presence/absence of ATP, immunoprecipitation, and quantitative mass spectrometry.
06:23
pH Modulation Assay on Supported Lipid Bilayers to Detect Protein-Phosphoinositide Interactions
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2025
In this video, we demonstrate protein-phosphoinositide interactions in a microfluidic pattern using the pH modulation assay, using pH-sensitive fluorescent dye tagged to phosphatidylethanolamine lipid of a supported lipid bilayer, called a microfluidic platform. The modulations in pH after protein binding to phospholipid cause fluorescence quenching.
01:20
Antiepileptic Drugs: Modulators of Neurotransmitter Release Mediated by SV2A Protein
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2024
Antiepileptic drugs, such as levetiracetam (Keppra) and brivaracetam (Briviact), have emerged as crucial tools in managing epilepsy. These medications exert their therapeutic effects by targeting the synaptic vesicle protein SV2A, a transmembrane glycoprotein primarily found in the brain. SV2A is a transmembrane glycoprotein located predominantly in the brain, modulating the release of neurotransmitters for neuronal communication. Both levetiracetam and brivaracetam exhibit a high affinity for...
FAQs
A modulator can bind an active site directly involved in a protein’s function or an allosteric site that influences it indirectly. Either interaction may change protein conformation, which can alter activity, stability, localization, or interactions. Distinguishing these binding locations helps biochemists connect a molecular binding event with the broader functional change observed in a cellular or experimental system.
Competition can reveal whether a modulator acts through the same molecular recognition process as a protein’s natural ligand. If the modulator displaces or counters that ligand, the resulting change in activity helps clarify how ligand availability contributes to regulation. This comparison is useful for interpreting enzyme control and signaling responses, especially when researchers want to separate direct effects from pathway-level consequences.
Phosphorylation can modify the functional state of a protein, whereas degradation changes how much of that protein remains available. These mechanisms can therefore influence activity, stability, localization, and interactions without relying solely on occupancy of an active or allosteric site. Considering both routes prevents researchers from attributing every observed biochemical effect to direct ligand binding.
A useful assessment considers more than a change in enzyme activity. Researchers can examine effects on protein stability, localization, and molecular interactions, then relate those observations to the relevant signaling pathway, regulatory process, or recognition event. This broader view helps distinguish a direct functional shift from changes in protein abundance, position, or interaction partners.
In drug discovery, comparing these functional categories helps link a compound’s effect to a therapeutic strategy. Inhibitors address abnormal activity by reducing it, activators increase a desired function, and stabilizers support a protein’s persistence or functional state. Studying these alternatives can reveal useful therapeutic targets and guide development of compounds matched to the protein problem under investigation.
Within biochemistry, modulators let researchers perturb signaling pathways, examine how enzymes are regulated, and investigate molecular recognition. The resulting changes in activity, conformation, or interactions can connect a protein-level event with cellular function. This makes the approach useful both for explaining normal control mechanisms and for identifying proteins whose abnormal activity may have therapeutic relevance.