The N276 glycosylation site is required for HIV-1 neutralization by the CD4 binding site specific HJ16 monoclonal antibody

PLoS One. 2013 Jul 17;8(7):e68863. doi: 10.1371/journal.pone.0068863. Print 2013.

Abstract

Immunogen design for HIV-1 vaccines could be based on epitope identification of naturally occurring neutralizing antibodies in infected patients. A tier 2 neutralizing monoclonal antibody (mAb), HJ16 recognizes a new epitope in the CD4 binding site (CD4bs) region that only partially overlaps with the b12 epitope. We aimed to identify the critical binding site by resistance induction in a sensitive primary CRF02_AG strain. In four independent dose-escalation studies, the N276D mutation was consistently the only alteration found and it was confirmed to be responsible for resistance to HJ16 by site-directed mutagenesis in envelopes (envs) of the homologous CRF02_AG, as well as of a subtype A and a subtype C primary isolate. This mutation removes an N-linked glycosylation site. The effect of N276D was very selective, as it failed to confer resistance to a range of other entry inhibitors. Remarkably, sensitivity to the CD4bs VRC01 and VRC03 mAbs was increased in the N276D mutated viruses. These data indicate that binding of the CD4bs specific HJ16 mAb critically depends on the interaction with the N276-glycan, thus indicating that HJ16 is the first glycan dependent CD4bs-specific mAb.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antibodies, Monoclonal / immunology*
  • Base Sequence
  • CD4 Antigens / immunology*
  • Cells, Cultured
  • DNA Primers
  • Glycosylation
  • HIV-1 / immunology*
  • Humans
  • Mutagenesis, Site-Directed
  • Neutralization Tests*

Substances

  • Antibodies, Monoclonal
  • CD4 Antigens
  • DNA Primers

Grants and funding

This work was supported to a large extent by the Collaboration for AIDS Vaccine Discovery (CAVD) funded by the Bill & Melinda Gates Foundation (Project ID 38637) and in part by the European program CHAARM (Combined Highly Active Antiretroviral Microbicides Project n° 242135) as well as the European FP-7 NGIN program (Next Generation HIV-1 Immunogens inducing broadly reactive Neutralising antibodies Project n° 201433). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.