Affinity adsorption of plasmid DNA

Ghose, Siddhartha, Forde, Gareth M., & Slater, Nigel K. H. (2004) Affinity adsorption of plasmid DNA. Biotechnology Progress, 20(3), pp. 841-850.

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The development of a protein-mediated dual functional affinity adsorption of plasmid DNA is described in this work. The affinity ligand for the plasmid DNA comprises a fusion protein with glutathione-S-transferase (GST) as the fusion partner with a zinc finger protein. The protein ligand is first bound to the adsorbent by affinity interaction between the GST moeity and gluthathione that is covalently immobilized to the base matrix. The plasmid binding is then enabled via the zinc finger protein and a specific nucleotide sequence inserted into the DNA. At lower loadings, the binding of the DNA onto the Fractogel, Sepharose, and Streamline matrices was 0.0078 ± 0.0013, 0.0095 ± 0.0016, and 0.0080 ± 0.0006 mg, respectively, to 50 μL of adsorbent. At a higher DNA challenge, the corresponding amounts were 0.0179 ± 0.0043, 0.0219 ± 0.0035, and 0.0190 ± 0.0041 mg, respectively. The relatively constant amounts bound to the three adsorbents indicated that the large DNA molecule was unable to utilize the available zinc finger sites that were located in the internal pores and binding was largely a surface adsorption phenomenon. Utilization of the zinc finger binding sites was shown to be highest for the Fractogel adsorbent. The adsorbed material was eluted with reduced glutathione, and the eluted efficiency for the DNA was between 23% and 27%. The protein elution profile appeared to match the adsorption profiles with significantly higher recoveries of bound GST-zinc finger protein.

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ID Code: 81577
Item Type: Journal Article
Refereed: Yes
Keywords: Adsorption, Diffusion, DNA, Enzyme immobilization, Surface reactions, Affinity adsorption, Plasmids, Biotechnology, DNA binding protein, glutathione, hybrid protein, zinc finger protein, affinity chromatography, article, chemistry, comparative study, evaluation, gel chromatography, isolation and purification, methodology, plasmid, protein binding, Chromatography, Affinity, Chromatography, Gel, DNA-Binding Proteins, Recombinant Fusion Proteins, Zinc Fingers
DOI: 10.1021/bp034257n
ISSN: 8756-7938
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 05 Feb 2015 22:46
Last Modified: 05 Feb 2015 22:46

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