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. 1990;68(Suppl):17–25.

The conformational restriction of synthetic vaccines for malaria.

A C Satterthwait 1, L C Chiang 1, T Arrhenius 1, E Cabezas 1, F Zavala 1, H J Dyson 1, P E Wright 1, R A Lerner 1
PMCID: PMC2393045  PMID: 2094582

Abstract

The effectiveness of synthetic vaccines is dependent upon the chance event that antibodies formed against largely disordered peptides can bind native protein surfaces which are often ordered. To improve on this situation, new methods are being developed for the conformational restriction of synthetic peptides. Cognate peptide sequences often form predictable secondary structures in proteins characterized by distinct hydrogen-bonding patterns. These weak hydrogen bonds have now been replaced with covalent mimics to conformationally restrict selected peptides to the Type 1 reverse turn and alpha helix. Potential uses for this chemistry are discussed in the context of malaria vaccines. The peptide component of a Plasmodium falciparum sporozoite vaccine, acetyl-(ASN-ALA-ASN-PRO)3-NH2 has been conformationally analysed using two-dimensional nuclear magnetic resonance spectroscopy. These studies are consistent with the formation of transiently ordered turnlike structures which provide a guide for the design and synthesis of a conformationally restricted synthetic vaccine. To assess the effects of conformational restriction and chemical modification on the sporozoite vaccine, ASN side-chains were linked around proline with ethylene bridges. Polyclonal antibodies to this shaped peptide show a strong cross-reaction with living sporozoites.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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