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DNA affinity chromatography.

P S Chockalingam¹, L A Jurado, H W Jarrett

¹Department of Biochemistry, University of Tennessee, 858 Madison Avenue, Memphis, TN 38163, USA.

Molecular Biotechnology

|December 1, 2001

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DNA-affinity chromatography purifies DNA-binding proteins using improved coupling methods. This technique enhances cellular process control by enabling the isolation of key proteins like transcription factors and polymerases.

Area of Science:

Biochemistry
Molecular Biology
Chromatography

Background:

DNA-affinity chromatography is crucial for purifying DNA-binding proteins that regulate cellular functions.
Advancements in coupling methodologies and support materials have improved its efficacy over time.

Purpose of the Study:

To describe optimized procedures for coupling oligonucleotides to solid supports for DNA-affinity chromatography.
To detail methods for quantifying oligonucleotide coupling and synthesizing affinity columns using enzymatic approaches.

Main Methods:

Coupling of 5'-aminoethyl-(dT)18 to N-hydroxysuccinimide/carbodiimide-activated silica.
Cyanogen bromide-mediated coupling of aminoethyl-(dT)18 to Sepharose.
Quantification of (dT)18 coupling via hybridization with a complementary (dA)18-labeled oligonucleotide.

Related Experiment Videos

Enzymatic synthesis of double-stranded DNA-silica or Sepharose affinity columns using DNA/RNA templates.

Main Results:

Established protocols for efficient coupling of DNA ligands to silica and Sepharose supports.
Demonstrated a reliable method for assessing the density of immobilized DNA ligands.
Showcased template-directed enzymatic synthesis as a base-modification-free approach for affinity column creation.

Conclusions:

DNA-affinity chromatography is a versatile and powerful technique for protein purification.
The described methods offer improved strategies for developing highly specific affinity supports.
This technology is being extended for the purification of critical enzymes such as transcription factors, polymerases, and nucleases.