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Precise location of sequential dengue virus subcomplex and complex B cell epitopes on the nonstructural-1 glycoprotein

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Summary

The reactions of a panel of 34 mouse monoclonal antibodies (MAbs) specific for the dengue-2 virus nonstructural-1 glycoprotein (NS1), were analysed using 174 overlapping synthetic nonameric peptides covering the entire sequence. Using this methodology, four epitopes were identified. One pair of MAbs, which defined a dengue-2/4 virus subcomplex epitope (24C: amino acids 299–309) using native NS1 proteins, showed the same reaction pattern with synthetic peptides containing the corresponding NS1 sequences of each virus serotype. One amino acid substitution, present in the sequences from the dengue-1/3 virus subcomplex abrogated almost all reaction by these MAbs. A dengue complex epitope (LX1: amino acids 111–121) was also located and peptides containing the sequences of each serotype were shown to contain only antigenically silent amino-acid substitutions. In contrast, MAbs which defined a dengue type-specific epitope (LD2: amino acids 25–33) and another dengue subcomplex epitope (24A: amino acids 61–69) failed to show the same reaction profiles using peptides of each serotype, suggesting that these determinants were partially dependent upon conformation. The LX1 epitope is a good candidate for further trials aimed at generating cross-protective immune responses to these viruses without the risk of antibody-dependent enhancement.

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Authors and Affiliations

  1. Department of Medical Parasitology, London School of Hygiene and Tropical Medicine, London, UK

    A. K. I. Falconar & M. A. Miles

  2. Sir Albert Sakzewski Virus Research Laboratory, The Royal Children's Hospital, Herston, Brisbane, Queensland, Australia

    P. R. Young

Authors
  1. A. K. I. Falconar
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  2. P. R. Young
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  3. M. A. Miles
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Falconar, A.K.I., Young, P.R. & Miles, M.A. Precise location of sequential dengue virus subcomplex and complex B cell epitopes on the nonstructural-1 glycoprotein. Archives of Virology 137, 315–326 (1994). https://doi.org/10.1007/BF01309478

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