Synthetic glycopeptide vaccines combining beta-mannan and peptide epitopes induce protection against candidiasis.

Proceedings of the National Academy of Sciences of the United States of America
Hong XinJim E Cutler

Abstract

The first fully synthetic glycopeptide vaccines against a fungal disease have been used to combat disseminated candidiasis in mice. Six T cell peptides found in Candida albicans cell wall proteins were selected by algorithm peptide epitope searches; each was synthesized and conjugated to the fungal cell wall beta-mannan trisaccharide [beta-(Man)(3)] by novel saccharide-peptide linker chemistry to create glycopeptide conjugates. The six proteins were selected because of expression during human candidiasis and cell wall association and included: fructose-bisphosphate aldolase (Fba); methyltetrahydropteroyltriglutamate (Met6); hyphal wall protein-1 (Hwp1); enolase (Enol); glyceraldehyde-3-phosphate dehydrogenase (Gap1); and phosphoglycerate kinase (Pgk1). By immunization protocols favoring production of protective antibody, the beta-(Man)(3)-Fba, beta-(Man)(3)-Met6 and beta-(Man)(3)-Hwp1 induced protection evidenced by survival and reduced kidney fungal burden, the beta-(Man)(3)-Eno1 and beta-(Man)(3)-Gap1 gave moderate protection, and the beta-(Man)(3)-Pgk1 slightly enhanced disease. For the beta-(Man)(3)-Fba conjugate, protection was uniquely acquired through immunity against the carbohydrate and the Fba peptide. This approach b...Continue Reading

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