Simultaneous refolding and purification of recombinant proteins by macro-(affinity ligand) facilitated three-phase partitioning

Gautam, Saurabh and Dubey, Priyanka and Singh, Pranveer and Varadarajan, Raghavan and Gupta, Munishwar N (2012) Simultaneous refolding and purification of recombinant proteins by macro-(affinity ligand) facilitated three-phase partitioning. In: Analytical Biochemistry, 430 (1). pp. 56-64.

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Abstract

A strategy called macro-(affinity ligand) facilitated three-phase partitioning (MLFTPP) is described for refolding of a diverse set of recombinant proteins starting from the solubilized inclusion bodies. It essentially consists of: (i) binding of the protein with a suitable smart polymer and (ii) precipitating the polymer-protein complex as an interfacial layer by mixing in a suitable amount of ammonium sulfate and t-butanol. Smart polymers are stimuli-responsive polymers that become insoluble on the application of a suitable stimulus (e.g., a change in the temperature, pH, or concentration of a chemical species such as Ca 2+ or K +). The MLFTPP process required approximately 10min, and the refolded proteins were found to be homogeneous on sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The folded proteins were characterized by fluorescence emission spectroscopy, circular dichroism spectroscopy, biological activity, melting temperature, and surface hydrophobicity measurements by 8-anilino-1-naphthalenesulfonate fluorescence. Two refolded antibody fragments were also characterized by measuring K D by Biacore by using immobilized HIV-1 gp120. The data demonstrate that MLFTPP is a rapid and convenient procedure for refolding a variety of proteins from inclusion bodies at high concentration. Although establishing the generic nature of the approach would require wider trials by different groups, its success with the diverse kinds of proteins tried so far appears to be promising.

Item Type:	Journal Article
Publication:	Analytical Biochemistry
Publisher:	Elsevier Science
Additional Information:	Copyright for this article belongs to Elsevier SCience
Keywords:	Smart polymers;Macro-(affinityligand) facilitatedthree-phasepartitioning;Proteinrefolding;Three-phasepartitioning; Maltose binding protein; Antibody fragments
Department/Centre:	Division of Biological Sciences > Molecular Biophysics Unit
Date Deposited:	19 Sep 2012 05:25
Last Modified:	19 Sep 2012 05:25
URI:	http://eprints.iisc.ac.in/id/eprint/45025

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