Definition and research guide
This page combines a MeSH definition, publication statistics and selected research abstracts. It is a starting point for reading the literature, not a medical textbook or a systematic evidence review.
Content available: 4 complete abstracts (650 words), 10 references. Full article text is not stored or reproduced here; follow the PMID, DOI or PMC links to read the original sources and their access terms.
Definition
A type of fluorescence spectroscopy using two fluorescent dyes with overlapping emission and absorption spectra, which is used to indicate proximity of labeled molecules. This technique is useful for studying interactions of molecules and protein folding.
Definition: NLM Medical Subject Headings (MeSH) scope note (Public domain (U.S. National Library of Medicine); attribution requested). View the MeSH record.
Also known as: Forster Resonance Energy Transfer.
Where it fits in the MeSH classification
- Broader topics
- Spectrometry, Fluorescence; Energy Transfer
Related concepts
- Fluorescence Spectroscopy
- Fluorescent Dyes
- Protein Folding
Research landscape
PubMed indexes 15,816 records tagged with the MeSH heading “Fluorescence Resonance Energy Transfer” (counts retrieved 2026-10-29). 3,311 of them (20.9%) were published from 2020 onward, and the busiest period so far is 2010-2019 with 8,157 records.
Reviews account for 1,249 records (7.9%) and meta-analyses for 1. Randomized controlled trials number 0 (0.0%) as a share of all records on the topic. Randomized trials make up only a small share of this literature, so much of what is known comes from laboratory, observational or descriptive work.
Show the data
| Period | Records |
|---|---|
| through 1999 | 0 |
| 2000-2009 | 4,520 |
| 2010-2019 | 8,157 |
| 2020 onward | 3,311 |
Publication-type chart data
| Type | Records | Share |
|---|---|---|
| Reviews | 1,249 | 7.9% |
| Meta-analyses | 1 | 0.0% |
| Randomized controlled trials | 0 | 0.0% |
Method: PubMed query "Fluorescence Resonance Energy Transfer"[MeSH Terms] with publication-type and date filters, retrieved 2026-10-29.
Reading the evidence in molecular biology
Molecular biology establishes mechanisms through controlled experiments, often in simplified systems such as purified proteins, cultured cells or model organisms. Such work can show what is possible in a defined system, but whether a pathway matters in a whole organism or in human disease needs further evidence. Check the experimental system, whether findings were reproduced by independent groups, and whether the authors tested the mechanism directly or inferred it from correlation.
Evidence from open-access studies
These open-access studies come from PubMed’s best-match results for this heading (papers whose main topic it is), ranked here by citation count, with one recent addition. Each abstract is reproduced in full under its recorded open licence so that you can read the authors’ own words. They illustrate the literature; they are not a systematic summary of it. Citation counts measure attention, not reliability or clinical benefit.
FRET-based dynamic structural biology: Challenges, perspectives and an appeal for open-science practices [1]
Abstract reading summary — source excerpts
- Opening excerpt
- Single-molecule FRET (smFRET) has become a mainstream technique for studying biomolecular structural dynamics.
- Closing excerpt
- To make further progress, we strongly encourage 'open science' practices.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (177 words)
Single-molecule FRET (smFRET) has become a mainstream technique for studying biomolecular structural dynamics. The rapid and wide adoption of smFRET experiments by an ever-increasing number of groups has generated significant progress in sample preparation, measurement procedures, data analysis, algorithms and documentation. Several labs that employ smFRET approaches have joined forces to inform the smFRET community about streamlining how to perform experiments and analyze results for obtaining quantitative information on biomolecular structure and dynamics. The recent efforts include blind tests to assess the accuracy and the precision of smFRET experiments among different labs using various procedures. These multi-lab studies have led to the development of smFRET procedures and documentation, which are important when submitting entries into the archiving system for integrative structure models, PDB-Dev. This position paper describes the current 'state of the art' from different perspectives, points to unresolved methodological issues for quantitative structural studies, provides a set of 'soft recommendations' about which an emerging consensus exists, and lists openly available resources for newcomers and seasoned practitioners. To make further progress, we strongly encourage 'open science' practices.
Abstract reproduced from the open-access article under the recorded cc0 licence; © the authors. PMID 33779550 · DOI · PMC8007216
Reliability and accuracy of single-molecule FRET studies for characterization of structural dynamics and distances in proteins [2]
Abstract reading summary — source excerpts
- Opening excerpt
- Single-molecule Förster-resonance energy transfer (smFRET) experiments allow the study of biomolecular structure and dynamics in vitro and in vivo.
- Closing excerpt
- Our work demonstrates the ability of smFRET experiments to simultaneously measure distances and avoid the averaging of conformational dynamics for realistic protein systems, highlighting its importance in the expanding toolbox of integrative structural biology.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (141 words)
Single-molecule Förster-resonance energy transfer (smFRET) experiments allow the study of biomolecular structure and dynamics in vitro and in vivo. We performed an international blind study involving 19 laboratories to assess the uncertainty of FRET experiments for proteins with respect to the measured FRET efficiency histograms, determination of distances, and the detection and quantification of structural dynamics. Using two protein systems with distinct conformational changes and dynamics, we obtained an uncertainty of the FRET efficiency ≤0.06, corresponding to an interdye distance precision of ≤2 Å and accuracy of ≤5 Å. We further discuss the limits for detecting fluctuations in this distance range and how to identify dye perturbations. Our work demonstrates the ability of smFRET experiments to simultaneously measure distances and avoid the averaging of conformational dynamics for realistic protein systems, highlighting its importance in the expanding toolbox of integrative structural biology.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 36973549 · DOI · PMC10089922
Temporal analysis of T-cell receptor-imposed forces via quantitative single molecule FRET measurements [3]
Abstract reading summary — source excerpts
- Opening excerpt
- Mechanical forces acting on ligand-engaged T-cell receptors (TCRs) have previously been implicated in T-cell antigen recognition, yet their magnitude, spread, and temporal behavior are still poorly defined.
- Closing excerpt
- When facing fluid-phase SLBs instead, T-cells still exerted tensile forces yet of threefold reduced magnitude and only prior to but not upon activation.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (132 words)
Mechanical forces acting on ligand-engaged T-cell receptors (TCRs) have previously been implicated in T-cell antigen recognition, yet their magnitude, spread, and temporal behavior are still poorly defined. We here report a FRET-based sensor equipped either with a TCR-reactive single chain antibody fragment or peptide-loaded MHC, the physiological TCR-ligand. The sensor was tethered to planar glass-supported lipid bilayers (SLBs) and informed most directly on the magnitude and kinetics of TCR-imposed forces at the single molecule level. When confronting T-cells with gel-phase SLBs we observed both prior and upon T-cell activation a single, well-resolvable force-peak of approximately 5 pN and force loading rates on the TCR of 1.5 pN per second. When facing fluid-phase SLBs instead, T-cells still exerted tensile forces yet of threefold reduced magnitude and only prior to but not upon activation.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 33947864 · DOI · PMC8096839
Single-Molecule Forster Resonance Energy Transfer With a Minimalistic 3D-Printed Setup and Dyes in the Blue-Green Spectral Region [4]
Abstract reading summary — source excerpts
- Opening excerpt
- Förster Resonance Energy Transfer (FRET) is a powerful technique for the detection and characterization of biomolecular interactions and conformational changes with subnanometer spatial resolution and a temporal resolution down to the timescale of fluorescence.
- Closing excerpt
- Our work demonstrates that qualitative and quantitative single-molecule FRTE (smFRET) measurements are possible with the minimalistic and cost-effective FRET-Brick.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (200 words)
Förster Resonance Energy Transfer (FRET) is a powerful technique for the detection and characterization of biomolecular interactions and conformational changes with subnanometer spatial resolution and a temporal resolution down to the timescale of fluorescence. While the technique is widely adopted in structural biology and biophysics, the evolution of single-molecule FRET has led to experimental setups with sophisticated optical layouts, multilaser excitation schemes, and time-resolved detection electronics. We here present an accessible alternative toward single-molecule FRET based on Brick-MIC, a recently introduced three-dimensional (3D)-printed microspectroscopy platform. The FRET-Brick uses continuous-wave excitation at 488 nm with a minimal set of optomechanical components and photomultiplier detectors (PMTs). With this, we were able to significantly reduce the setup complexity retaining single-molecule sensitivity with dyes matching the sensitivity of PMTs. To maximize the photon output of Alexa488, ATTO488 (donors), Alexa555, ATTO542, and Cy3B (acceptors), we introduce ferrocene derivatives as photostabilizers that increase both dye brightness and remove dark-states. We benchmark the performance of the FRET-Brick with fluorophore-labeled oligonucleotide reference structures also in comparison to accessible volume simulations, and by detecting conformational changes in bacterial substrate-binding proteins. Our work demonstrates that qualitative and quantitative single-molecule FRTE (smFRET) measurements are possible with the minimalistic and cost-effective FRET-Brick.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 42059834 · DOI · PMC13131691
Key reviews and meta-analyses
The most cited review-type papers among PubMed’s best-match results for this heading, listed with bibliographic details only. Follow the links for the full text and access terms.
- Research article Materials for fluorescence resonance energy transfer analysis: beyond traditional donor-acceptor combinations [5]
- Research article Fluorescence lifetime imaging microscopy: fundamentals and advances in instrumentation, analysis, and applications [6]
- Research article Protein folding studied by single-molecule FRET [7]
- Research article Förster resonance energy transfer (FRET)-based small-molecule sensors and imaging agents [8]
- Research article FRET as a biomolecular research tool - understanding its potential while avoiding pitfalls [9]
- Research article A Guide to Fluorescent Protein FRET Pairs [10]
References
- Lerner E, Barth A, Hendrix J, Ambrose B, Birkedal V, Blanchard SC, et al.. FRET-based dynamic structural biology: Challenges, perspectives and an appeal for open-science practices. . 2021. PMID 33779550 · DOI · PMC8007216
- Agam G, Gebhardt C, Popara M, Mächtel R, Folz J, Ambrose B, et al.. Reliability and accuracy of single-molecule FRET studies for characterization of structural dynamics and distances in proteins. . 2023. PMID 36973549 · DOI · PMC10089922
- Göhring J, Kellner F, Schrangl L, Platzer R, Klotzsch E, Stockinger H, et al.. Temporal analysis of T-cell receptor-imposed forces via quantitative single molecule FRET measurements. . 2021. PMID 33947864 · DOI · PMC8096839
- Moya Muñoz GG, Luna Piedra JR, Con P, Rohman MA, Lu S, Peulen TO, et al.. Single-Molecule Forster Resonance Energy Transfer With a Minimalistic 3D-Printed Setup and Dyes in the Blue-Green Spectral Region. . 2026. PMID 42059834 · DOI · PMC13131691
- Sapsford KE, Berti L, Medintz IL. Materials for fluorescence resonance energy transfer analysis: beyond traditional donor-acceptor combinations. Angew Chem Int Ed Engl. 2006. PMID 16819760 · DOI
- Datta R, Heaster TM, Sharick JT, Gillette AA, Skala MC. Fluorescence lifetime imaging microscopy: fundamentals and advances in instrumentation, analysis, and applications. J Biomed Opt. 2020. PMID 32406215 · DOI · PMC7219965
- Schuler B, Eaton WA. Protein folding studied by single-molecule FRET. Curr Opin Struct Biol. 2008. PMID 18221865 · DOI · PMC2323684
- Wu L, Huang C, Emery BP, Sedgwick AC, Bull SD, He XP, et al.. Förster resonance energy transfer (FRET)-based small-molecule sensors and imaging agents. Chem Soc Rev. 2020. PMID 32697225 · DOI · PMC7408345
- Algar WR, Hildebrandt N, Vogel SS, Medintz IL. FRET as a biomolecular research tool - understanding its potential while avoiding pitfalls. Nat Methods. 2019. PMID 31471616 · DOI
- Bajar BT, Wang ES, Zhang S, Lin MZ, Chu J. A Guide to Fluorescent Protein FRET Pairs. Sensors (Basel). 2016. PMID 27649177 · DOI · PMC5038762
About this article
- Sources
- NLM Medical Subject Headings (definition, synonyms); NCBI PubMed (counts, identifiers); Europe PMC (open-access abstracts and citation counts).
- Verification
- Every reference was resolved against PubMed on 2026-10-31; title, year and DOI matched.
- Review state
- automated source verified; no human expert review has been recorded yet.
- Version
- 1, last updated 2026-10-29.
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Evidence strength
EvidenceHelix's computed view of the study designs behind this topic: how common meta-analyses, randomized trials and reviews are, how recent the literature is, and a plain-language reading. It describes the design mix of the literature. It is not a quality appraisal of any study, and it is not medical advice.