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Purification of sequence-specific DNA-binding proteins by affinity chromatography.

L A Kerrigan¹, J T Kadonaga

¹University of California San Diego, La Jolla, California, USA.

Current Protocols in Molecular Biology

|February 12, 2008

Summary

This study details protein purification using DNA affinity chromatography. It provides protocols for preparing the DNA affinity resin and performing the chromatography, enabling efficient isolation of sequence-specific DNA-binding proteins.

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Area of Science:

Biochemistry
Molecular Biology
Protein Purification

Background:

Affinity chromatography is a powerful technique for protein purification.
Sequence-specific DNA-binding proteins can be isolated using DNA affinity chromatography.
This method relies on the specific interaction between a protein and its DNA recognition site.

Purpose of the Study:

To describe a detailed protocol for protein purification using DNA affinity chromatography.
To provide methods for preparing the DNA affinity resin and the chromatography procedure.
To outline essential parameters for successful affinity chromatography experiments.

Main Methods:

Preparation of a DNA affinity resin involving cyanogen bromide (CNBr) activation of agarose support.
Coupling of DNA to CNBr-activated Sepharose.
Purification of synthetic oligonucleotides by gel electrophoresis prior to resin preparation.
Affinity chromatography procedure utilizing the prepared resin.
Determination and preparation of nonspecific competitor DNA.

Main Results:

Established protocols for the preparation of DNA affinity resins.
Outlined a robust affinity chromatography procedure for protein purification.
Identified key parameters influencing the success of the purification process.

Conclusions:

DNA affinity chromatography is an effective and straightforward method for purifying sequence-specific DNA-binding proteins.
The described protocols provide a comprehensive guide for researchers.
Optimization of competitor DNA is crucial for efficient purification.