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DNA bending by proteins: utilizing plasmid pBendAT as a tool.

¹Department of Chemistry and Biochemistry, Florida International University, Miami, FL, USA.

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

|August 6, 2013

Summary

This study details a protocol using plasmid pBendAT to measure protein-induced DNA bending. Analyzing gel mobility shifts reveals DNA bending angles and binding sites, crucial for understanding DNA-protein interactions.

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Area of Science:

Molecular Biology
Biochemistry
Structural Biology

Background:

Protein-induced DNA bending is vital for DNA replication, recombination, and transcription.
Various biochemical and biophysical methods exist for DNA bending analysis, including EMSA, X-ray crystallography, NMR, and DNA ring closure assays.

Purpose of the Study:

To provide a detailed protocol for studying protein-induced DNA bending using the plasmid pBendAT.
To enable the determination of DNA bending angles and binding site locations.

Main Methods:

Utilizing the plasmid pBendAT to generate DNA fragments of identical length with varying protein-binding site positions.
Analyzing the gel mobility of protein-DNA complexes, where bending shortens the end-to-end distance and affects mobility.
Employing PCR amplification for convenient DNA fragment generation.

Main Results:

The method allows for the determination of DNA bending angles and the precise location of the bend within the DNA fragment.
The plasmid pBendAT is particularly suitable for studying proteins that recognize AT-rich DNA sequences.

Conclusions:

The described protocol offers a robust method for quantifying protein-induced DNA bending.
This technique enhances the understanding of DNA structural dynamics in essential biological processes.