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Effect of pressure on refolding of recombinant pentameric cholera toxin B.

Authors :
Rodrigues D
Farinha-Arcieri LE
Ventura AM
Chura-Chambi RM
Malavasi NV
Lemke LS
GuimarĂ£es JS
Ho PL
Morganti L
Source :
Journal of biotechnology [J Biotechnol] 2014 Mar 10; Vol. 173, pp. 98-105. Date of Electronic Publication: 2014 Jan 17.
Publication Year :
2014

Abstract

The production of recombinant proteins is an essential tool for the expansion of modern biological research and biotechnology. The expression of heterologous proteins in Escherichia coli often results in an incomplete folding process that leads to the accumulation of inclusion bodies (IB), aggregates that hold a certain degree of native-like secondary structure. High hydrostatic pressure (HHP) impairs intermolecular hydrophobic and electrostatic interactions, leading to dissociation of aggregates under non-denaturing conditions and is therefore a useful tool to solubilize proteins for posterior refolding. Cholera toxin (CT) is composed of a non-toxic pentamer of B subunits (CTB), a useful adjuvant in vaccines, and a toxic subunit A (CTA). We studied the process of refolding of CTB using HHP. HHP was shown to be effective for dissociation of CTB monomers from IB. Posterior incubation at atmospheric pressure of concentrated CTB (1mg/ml) is necessary for the association of the monomers. Pentameric CTB was obtained when suspensions of CTB IB were compressed at 2.4kbar for 16h in the presence of Tween 20 and incubated at 1bar for 120h. Soluble and biologically active pentameric CTB was obtained, with a yield of 213mg CTB/liter of culture. The experience gained in this study can be important to improve the refolding of proteins with quaternary structure.<br /> (Copyright © 2013 Elsevier B.V. All rights reserved.)

Details

Language :
English
ISSN :
1873-4863
Volume :
173
Database :
MEDLINE
Journal :
Journal of biotechnology
Publication Type :
Academic Journal
Accession number :
24445168
Full Text :
https://doi.org/10.1016/j.jbiotec.2013.12.006