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Related Experiment Video

Updated: Jul 13, 2025

Studying DNA Looping by Single-Molecule FRET

Studying DNA Looping by Single-Molecule FRET

Published on: June 28, 2014

Detecting DNA Loops Using Tethered Particle Motion.

Jin Qian¹, Dylan Collette¹, Laura Finzi¹

¹Department of Physics, Emory University, Atlanta, GA, USA.

Methods in Molecular Biology (Clifton, N.J.)

|October 12, 2023

Summary

This summary is machine-generated.

Tracking a micron-sized bead tethered to a polymer reveals polymer dynamics. This method, demonstrated with the lac repressor protein, effectively studies DNA-protein interactions and DNA looping.

Keywords:

Brownian motion DNA looping Tethered particle motion

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Area of Science:

Biophysics
Molecular Biology
Polymer Science

Background:

The movement of a micron-sized bead attached to a single polymer offers insights into the polymer's effective length and dynamics.
Bead excursions can indicate polymer flexibility, topology, and alterations caused by ligand binding.

Purpose of the Study:

To present a method for investigating polymer dynamics and ligand interactions.
To demonstrate the utility of this approach in studying DNA-protein interactions, specifically with the lac repressor.

Main Methods:

Utilizing a micron-sized bead tethered to a single polymer to measure its range of motion.
Analyzing bead excursions to infer polymer properties and ligand-induced changes.
Applying the method to study the lac repressor protein's interaction with DNA.

Main Results:

The bead's motion provides a dynamic readout of the polymer's effective length.
The approach successfully demonstrated the study of DNA-protein interactions.
Observed phenomena related to the lac repressor's ability to induce DNA looping.

Conclusions:

The tethered bead assay is a powerful tool for studying polymer behavior and interactions.
This method is effective for investigating complex biological systems like DNA-protein binding.
The lac repressor interaction with DNA serves as a key example of the assay's applicability.