Unravelling the antigenic landscape of the HIV-1 subtype A envelope of an individual with broad cross-neutralizing antibodies using phage display peptide libraries

T Dieltjens, B Willems, S Coppens, L Van Nieuwenhove, M Humbert, U Dietrich, L Heyndrickx, G Vanham, W Janssens

    Research output: Contribution to journalA1: Web of Science-article

    Abstract

    Broad cross-neutralizing antibodies from persons infected with HIV-1 target a variety of epitopes. Identification of these HIV-1 epitopes may result in an optimal panel of antigenic peptides to be included in a prophylactic vaccine. Phage display peptide libraries were used to unravel the antigenic landscape of an individual (ITM1) infected with HIV-1 subtype A with broad cross-neutralizing antibodies. A stringent selection strategy resulted in the identification of 60 unique HIV-1 peptide phage, which were subjected to sequence analysis and mapped onto the ITM1 envelope sequences. Four groups of peptide phages were found: the first group (n=11) were similar with the tip of the V3 loop (KxxHxGPxxxF); the second group (n=11) represented the gp41 principal immunodominant domain (CxGxLxCTxNxP); the third group (n=16) could be localized in the V2 loop (KxxxHxxxY); and the fourth group (n=22) mimicked a conformational epitope (Hxx(S)/(T)NxK). All but the V2-binding antibodies were conserved over the 11 years of follow-up. A neutralization inhibition assay revealed the contribution of the V3 antibodies to the neutralizing capacity of the ITM1 plasma. Overall, the ITM1 immunogenic landscape was mapped and a part of the origin of this broad cross-neutralizing activity was demonstrated
    Original languageEnglish
    JournalJournal of Virological Methods
    Volume169
    Issue number1
    Pages (from-to)95-102
    Number of pages8
    ISSN0166-0934
    DOIs
    Publication statusPublished - 2010

    Keywords

    • B780-tropical-medicine
    • Viral diseases
    • HIV-1
    • AIDS
    • Cross-neutralization
    • Antibodies
    • Epitopes
    • Identification
    • Peptides

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