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Structural Information from Single-molecule FRET Experiments Using the Fast Nano-positioning System
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iMAX FRET (Information Maximized FRET) for Multipoint Single-Molecule Structural Analysis
Bhagyashree S Joshi1, Carlos de Lannoy1, Mark R Howarth2
1Kavli Institute of Nanoscience, Department of Bionanoscience, Delft University of Technology, Delft 2629HZ, The Netherlands.
Nano Letters
|July 8, 2024
Summary
Introducing iMAX FRET, a novel method for 3D biomolecular profiling. This technique uses fluorescence resonance energy transfer (FRET) to reconstruct molecular structures from distance measurements, advancing structural biology.
Area of Science:
- Biophysics
- Structural Biology
- Molecular Biology
Background:
- Understanding biomolecular structure is crucial for biological function.
- Conventional ensemble methods offer limited insights into molecular dynamics.
- Existing single-molecule techniques provide restricted structural information.
Purpose of the Study:
- To introduce iMAX FRET, a novel method for *ab initio* 3D profiling of individual biomolecules.
- To enable simultaneous assessment of multiple distances within a biomolecule using FRET.
- To reconstruct 3D coordinates for structure-based inference.
Main Methods:
- Development of iMAX FRET, a one-pot method utilizing two-color FRET measurements.
- Stochastic exchange of fluorescent weak binders to probe molecular distances.
- Computational reconstruction of up to four points in 3D per molecule.
Main Results:
- Demonstrated 3D reconstruction of DNA nanostructures.
- Successfully determined protein quaternary structures.
- Visualized conformational changes in proteins with high resolution.
Conclusions:
- iMAX FRET offers a powerful approach to advance biomolecular structure determination.
- Expands conventional FRET analysis into three dimensions for enhanced insights.
- Facilitates a deeper understanding of biomolecular roles in biological systems.
