Single-photon smFRET: II. Application to continuous illumination

Ayush Saurabh, Matthew Safar, Mohamadreza Fazel, Ioannis Sgouralis, Steve Pressé

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Here we adapt the Bayesian nonparametrics (BNP) framework presented in the first companion article to analyze kinetics from single-photon, single-molecule Förster resonance energy transfer (smFRET) traces generated under continuous illumination. Using our sampler, BNP-FRET, we learn the escape rates and the number of system states given a photon trace. We benchmark our method by analyzing a range of synthetic and experimental data. Particularly, we apply our method to simultaneously learn the number of system states and the corresponding kinetics for intrinsically disordered proteins using two-color FRET under varying chemical conditions. Moreover, using synthetic data, we show that our method can deduce the number of system states even when kinetics occur at timescales of interphoton intervals.

Original languageEnglish (US)
Article number100087
JournalBiophysical Reports
Issue number1
StatePublished - Mar 8 2023

ASJC Scopus subject areas

  • Biochemistry
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)
  • Biophysics
  • Biotechnology


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