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Visualization of Surface-tethered Large DNA Molecules with a Fluorescent Protein DNA Binding Peptide

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Quantitation of DNA-Binding Affinity Using Tethered Particle Motion.

Bram Henneman¹, Joost Heinsman², Julius Battjes¹

¹Leiden Institute of Chemistry, Leiden University, Leiden, The Netherlands.

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

|August 16, 2018

Summary

Tethered Particle Motion (TPM) reliably measures DNA-binding protein constants by tracking bead motion. This single-molecule method, demonstrated with Integration Host Factor (IHF), offers a new way to analyze binding data.

Keywords:

DNA binding Displacement IHF Nucleoid associated protein Root mean square Single molecule Tethered particle motion

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Area of Science:

Molecular Biology
Biophysics
Biochemistry

Background:

Accurate measurement of DNA-binding protein constants is crucial for understanding biological processes.
Existing methods for determining binding constants often suffer from inherent limitations and inaccuracies.
Tethered Particle Motion (TPM) presents a viable alternative for characterizing DNA-protein interactions.

Purpose of the Study:

To demonstrate the utility of Tethered Particle Motion (TPM) for reliably measuring DNA-binding protein constants.
To showcase the application of TPM using the bacterial protein Integration Host Factor (IHF) as a model.
To introduce a novel, intuitive quantitative method for analyzing TPM data.

Main Methods:

Utilized Tethered Particle Motion (TPM), a single-molecule technique employing light microscopy to track bead motion.
Applied TPM to study the binding of the bacterial protein Integration Host Factor (IHF) to DNA.
Developed and implemented a new quantitative approach for data analysis from TPM experiments.

Main Results:

Demonstrated that TPM can reliably measure binding constants for DNA-binding proteins that induce DNA distortion.
Successfully characterized the specific binding of Integration Host Factor (IHF) to DNA using TPM.
Presented an intuitive quantitative method for displaying and interpreting TPM-derived binding data.

Conclusions:

Tethered Particle Motion (TPM) is a simple, cost-effective, and high-throughput method for accurately determining DNA-binding protein constants.
TPM is particularly effective for proteins that cause DNA distortion upon binding.
The proposed data analysis approach enhances the interpretability of TPM results for DNA-protein interaction studies.