ABEL-FRET: tether-free single-molecule FRET with hydrodynamic profiling

Area of Science:

• Biophysics
• Biochemistry
• Nanotechnology

Background:

• Single-molecule Förster resonance energy transfer (smFRET) is crucial for studying nanoscale conformation and dynamics.
• Existing smFRET methods often require molecule immobilization, limiting observation times and resolution.
• Current techniques may not fully achieve the potential resolution of FRET-based nanoscale metrology.

Purpose of the Study:

• To introduce ABEL-FRET, an innovative platform for immobilization-free smFRET measurements.
• To achieve ultrahigh resolving power in FRET efficiency for detailed molecular analysis.
• To integrate single-molecule diffusivity with FRET for comprehensive hydrodynamic and conformational profiling.

Main Methods:

• Development of the ABEL-FRET platform for single-molecule measurements.
• Utilizing single-molecule diffusivity for hydrodynamic profiling (size and shape determination).
• Concurrent measurement of intramolecular conformation using smFRET.

Main Results:

• ABEL-FRET enables immobilization-free smFRET measurements with exceptional resolution.
• Single-molecule diffusivity provides complementary size and shape information.
• The combined approach offers a holistic and dynamic view of biomolecules.

Conclusions:

• ABEL-FRET overcomes limitations of traditional smFRET by eliminating the need for immobilization.
• The integration of diffusivity and FRET measurements enhances the understanding of biomolecular behavior.
• This platform advances nanoscale metrology for dynamic biomolecular studies.