Intramolecular Fret
Intramolecular Fret - Related Videos
03:00
Intermolecular vs Intramolecular Forces
0 Views •
2020
Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
06:39
Förster Resonance Energy Transfer (FRET)
0 Views •
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...
09:47
FRET Imaging in Three-dimensional Hydrogels
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Cited by 3 •
2016
Förster resonance energy transfer (FRET) imaging is a powerful tool for real-time cell biology studies. Here a method for FRET imaging cells in physiologic three-dimensional (3D) hydrogel microenvironments using conventional epifluorescence microscopy is presented. An analysis for ratiometric FRET probes that yields linear ratios over the activation range is described.
01:18
Intramolecular Aldol Reaction
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2025
Intramolecular aldol reaction occurs in dicarbonyl compounds such as dialdehydes, diketones, and keto-aldehydes. The dicarbonyl compounds possess more than one nucleophilic ⍺ carbon for the base to deprotonate and form the enolates. For example, in symmetrical diketones, there are four ⍺ carbons. Hence, four types of enolates are possible when treated with a base. However, since the molecule is symmetrical, the enolates formed on either side of one carbonyl group are equivalent to those formed...
11:27
Studying DNA Looping by Single-Molecule FRET
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Cited by 13 •
2014
This study presents a detailed experimental procedure to measure looping dynamics of double-stranded DNA using single-molecule Fluorescence Resonance Energy Transfer (FRET). The protocol also describes how to extract the looping probability density called the J factor.
FAQs
Transfer efficiency changes steeply as the distance between the donor and acceptor changes over the nanometer scale. Consequently, even modest molecular rearrangements can produce measurable fluorescence differences. This distance sensitivity allows researchers to follow structural motion within a biomolecule rather than relying only on a static structural description, making the method useful for examining dynamic biochemical processes.
After the donor fluorophore becomes excited, it can transfer energy nonradiatively to a nearby acceptor. The resulting transfer efficiency depends on donor–acceptor separation, so changes in the fluorescence-related signal reflect changes in the labeled sites’ relative positions. The fluorophores therefore act as reporters that connect nanoscale movement inside one molecule to an observable measurement.
Intramolecular FRET can report structural changes associated with protein folding, conformational rearrangements, and ligand-induced changes. These events alter the relative positions of labeled sites, changing the transfer efficiency. Comparing the fluorescence signal during different molecular states helps researchers connect a biochemical event, such as ligand binding, with the accompanying nanoscale structural response.
The nanometer-scale range makes the method suited to structural changes that are too small to describe as large-scale molecular movement but large enough to alter donor–acceptor separation. Because efficiency responds sharply within this range, the signal can reveal whether labeled sites move closer together or farther apart during a biochemical transition, while remaining focused on local molecular geometry.
Researchers place a donor and an acceptor fluorophore at two selected sites within the same molecule, then monitor the fluorescence behavior associated with energy transfer. Changes in transfer efficiency are interpreted as changes in the separation of those sites. This workflow converts molecular structural dynamics into fluorescence data that can be examined during biochemical events.
During protein folding, the relative positions of labeled sites can change as the molecule adopts different structural arrangements. Monitoring intramolecular FRET provides a way to follow those distance changes over time through the fluorescence signal. The resulting measurements help connect folding-related motion with the dynamic behavior of the protein rather than observing only an endpoint.
Real-time measurements allow researchers to follow structural responses as they occur after a ligand influences a biomolecule. A change in transfer efficiency indicates that the labeled sites have changed separation, linking the ligand-associated event to molecular rearrangement. This approach can also compare behavior under different biochemical conditions, helping reveal how context affects biomolecular function.