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Reversible protection of disulfide bonds followed by oxidative folding render recombinant hCGbeta highly immunogenic.

Authors
Type
Published Article
Journal
Vaccine
0264-410X
Publisher
Elsevier
Publication Date
Volume
18
Issue
17
Pages
1802–1810
Identifiers
PMID: 10699328
Source
Medline
License
Unknown

Abstract

Active immunization of women against human chorionic gonadotropin (hCG) has been considered as a promising option for contraception. However, prototype hCG vaccines based on natural sources of antigen are expected to be costlier for use by common people. In the present report, a functionally active, cost-effective antigen of bacterial origin has been described. Sulfonation of thiol groups of the protein, anion-exchange purification, refolding with concomitant formation of disulfide bonds in the presence of cysteamine-cystamine redox buffer, and slow removal of denaturant resulted in 95% homogeneous, monomeric form of the antigen. The recombinant processed antigen [CGbeta(p)] obtained this way was highly immunopotent. Cellular DNA and endotoxin contaminants were appreciably low in the final product. The immunogenic response was drastically reduced with the unprocessed antigen. This finding envisages better prospect of a cost-effective hCG vaccine for birth control.

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