48-spot single-molecule FRET setup with periodic acceptor excitation

Area of Science:

• Biophysics
• Biochemistry
• Analytical Chemistry

Background:

• Single-molecule Förster resonance energy transfer (smFRET) measures distances (3-10 nm) in biomolecules.
• Solution-based smFRET analyzes binding events and conformational changes without ensemble averaging.
• Current smFRET methods suffer from low throughput, limiting kinetic studies.

Purpose of the Study:

• To develop a high-throughput smFRET system to overcome current throughput limitations.
• To enable real-time kinetic studies and facilitate high-throughput screening applications.
• To enhance the study of heterogeneous biological samples.

Main Methods:

• Developed a multiplexed smFRET system with 48 excitation spots and dual detectors.
• Employed dual laser excitation to differentiate species with one or two fluorophores.
• Validated system performance using DNA oligonucleotides with varying dye distances.

Main Results:

• Achieved significant reduction in acquisition time for subpopulation identification (minutes to seconds).
• Demonstrated accurate separation of species with different numbers of fluorophores.
• Successfully characterized DNA duplexes with varying donor-acceptor distances.

Conclusions:

• The developed high-throughput smFRET system dramatically improves measurement speed.
• This advancement opens possibilities for real-time kinetic analysis of enzymatic reactions.
• Enables high-throughput screening and detailed studies of complex biomolecular systems.