Fret Reporter Assay
Fret Reporter Assay - Related Videos
04:11
A FRET Flow Cytometry Technique to Detect Tau-Seed Induced Reporter Protein Aggregation
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2025
The video demonstrates a fluorescence resonance energy transfer (FRET) flow cytometry assay to detect the seeding activity of protein aggregates isolated from biological samples. Mammalian cells expressing tau reporter proteins are incubated with liposome transduction complexes containing tau seeds. These seeds mediate the aggregation of the reporter proteins, leading to generating a FRET positive signal in the flow cytometer.
19:05
Measuring TCR-pMHC Binding In Situ using a FRET-based Microscopy Assay
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Cited by 9 •
2015
This manuscript describes how to conduct (single molecule) Förster Resonance Energy Transfer (FRET)- based assays to measure the binding dynamics between T-cell antigen receptor (TCR) and antigenic peptide-loaded MHC molecules as they occur within the immunological synapse of a T-cell in contact with a functionalized planar supported lipid bilayer.
09:12
G Protein-selective GPCR Conformations Measured Using FRET Sensors in a Live Cell Suspension Fluorometer Assay
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Cited by 4 •
2016
Simple methods to detect the selective activation of G proteins by G protein-coupled receptors remain an outstanding challenge in cell signaling. Here, Fӧrster resonance energy transfer (FRET) biosensors have been developed by pairwise tethering a GPCR to G protein peptides to probe conformational changes at controlled concentrations in live cells.
02:59
An In Vitro Assay for Measuring Neutrophil Serine Protease Activity Using a Fluorescent Reporter
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2025
This video demonstrates an in vitro assay to quantify neutrophil serine protease activity in sputum samples. The sample containing secreted protease is incubated with a fluorescent reporter bearing a recognition motif. Cleavage of the motif by the protease enables individual fluorescence emission by the donor and acceptor fluorophore of the reporter, indicating protease activity in the sample.
06:39
Förster Resonance Energy Transfer (FRET)
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2023
Förster resonance energy transfer (FRET) is a phenomenon used to investigate close-range biochemical interactions. In FRET, a donor photoluminescent molecule can non-radiatively transfer energy to an acceptor molecule if their respective emission and absorbance spectra overlap. The amount of energy transferred—and consequently the overall emission of sample—depends on the proximity of an acceptor-donor pair of photoluminescent molecules. FRET analysis is combined with other biochemistry...
FAQs
The assay depends on energy transfer between a donor and acceptor fluorophore when they are sufficiently close. A molecular event that changes their proximity or arrangement alters the measured fluorescence. This makes the signal a readout of an underlying interaction, conformational transition, or enzymatic event rather than simply a measure of fluorophore presence.
Protease-mediated cleavage changes the physical relationship between the paired fluorophores. That altered arrangement produces a fluorescence change that can be associated with protease activity. In infection studies, the resulting signal helps reveal whether a pathogen-derived enzyme is active and supports quantitative monitoring of that activity over time.
The measured fluorescence change is interpreted according to the reporter design and the biological event being studied. A reporter can indicate protein association, a conformational change, or cleavage by an active enzyme. This flexibility allows one fluorescence-based approach to examine different molecular mechanisms involved in immune signaling and host–pathogen interactions.
A study first uses a reporter containing paired fluorophores suited to the target molecular process. Fluorescence is then measured while the relevant interaction, conformational change, or enzymatic reaction occurs. Changes in the signal are analyzed quantitatively and, when measurements are collected over time, can show the progression of the biological event.
They are useful when researchers need to follow pathogen-derived enzymes, immune signaling pathways, or host–pathogen interactions as they occur. Real-time fluorescence measurements can connect molecular activity with infection mechanisms or immune responses, helping investigators characterize how these processes develop rather than relying only on a single endpoint observation.
An inhibitor can be assessed by monitoring how it affects the fluorescence signal associated with a target enzymatic or molecular process. Because the assay provides sensitive, quantitative measurements, researchers can compare activity in the presence or absence of an inhibitor. This supports investigation of compounds designed to interfere with infection mechanisms or related biological pathways.