Directing the Immune Response to Carbohydrate Antigens

Gina Cunto-Amesty, Tarun K. Dam, Ping Luo, Behjatolah Monzavi-Karbassi, C. Fred Brewer, Thomas C. Van Cott, Thomas Kieber-Emmons

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

Peptide mimetics may substitute for carbohydrate antigens in vaccine design applications. At present, the structural and immunological aspects of antigenic mimicry, which translate into immunologic mimicry, as well as the functional correlates of each, are unknown. In contrast to screening peptide display libraries, we demonstrate the feasibility of a structure-assisted vaccine design approach to identify functional mimeotopes. By using concanavalin A (ConA), as a recognition template, peptide mimetics reactive with ConA were identified. Designed peptides were observed to compete with synthetic carbohydrate probes for ConA binding, as demonstrated by enzyme-linked immunosorbent assay and isothermal titration calorimetry (ITC) analysis. ITC measurements indicate that a multivalent form of one particular mimetic binds to ConA with similar affinity as does trimannoside. Splenocytes from mimeotope-immunized mice display a peptide-specific cellular response, confirming a T-cell-dependent nature for the mimetic. As ConA binds to the Envelope protein of the human immunodeficiency virus, type 1 (HIV-1), we observed that mimeotope-induced serum also binds to HIV-1-infected cells, as assessed by flow cytometry, and could neutralize T-cell fine adapted HIV-1 isolates in vitro, albeit at low titers. These studies emphasize that mimicry is based more upon functional rather than structural determinants that regulate mimeotope-induced T-dependent antibody responses to polysaccharide and emphasize that rational approaches can be employed to develop further vaccine candidates.

Original languageEnglish (US)
Pages (from-to)30490-30498
Number of pages9
JournalJournal of Biological Chemistry
Volume276
Issue number32
DOIs
StatePublished - Aug 10 2001

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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  • Cite this

    Cunto-Amesty, G., Dam, T. K., Luo, P., Monzavi-Karbassi, B., Brewer, C. F., Van Cott, T. C., & Kieber-Emmons, T. (2001). Directing the Immune Response to Carbohydrate Antigens. Journal of Biological Chemistry, 276(32), 30490-30498. https://doi.org/10.1074/jbc.M103257200