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Volume 9 Supplement 2

AIDS Vaccine 2012

  • Poster presentation
  • Open Access

Recognition and penetration of the HIV-1 Env glycan shield by potent broadly neutralizing antibodies

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Retrovirology20129 (Suppl 2) :P48

  • Published:


  • Monoclonal Antibody
  • Infectious Disease
  • Cancer Research
  • Biochemical Analysis
  • Structural Characterization


Human monoclonal antibodies have been characterized recently that potently neutralize HIV-1 isolates across all clades. These exciting new antibodies (PGT series) were derived from direct functional screening of B cells from IAVI protocol G donors (Theraclone/Monogram) and are unusually potent with binding predicted to be to novel glycan-dependent epitopes on Env.


Structures of these new PGT antibodies are being determined by x-ray crystallography and electron microscopy with further characterization using binding and mutagenesis assays.


The crystal and EM structures so far have been elucidated for many of these antibodies. Work on the others are in progress, focusing on Fab complexes with glycans, gp120 core and fragment constructs, as well as Env trimers.


Structural characterization and biochemical analysis of these antibodies have uncovered novel specificities to new glycan-dependent epitopes and reveal further mechanisms for viral neutralization. These new epitopes provide additional insights for neutralization of HIV-1 and how antibodies can bind and penetrate the glycan shield, a novel framework for structure-assisted vaccine design.

This study was supported by the International AIDS Vaccine Initiative (IAVI), Ragon Institute of MGH, MIT and Harvard, and NIH AI84817.

Authors’ Affiliations

Dept. of Molecular Biology, The Scripps Research Institute, La Jolla, CA, USA
Dept Imm & Microbial Sci & IAVI NAC, The Scripps Research Institute, La Jolla, CA, USA
The Scripps Research Institute, Ragon Institute MIT, Boston, MA, USA
Weill Medical College of Cornell University, New York, NY, USA
Academic Medical Center, Weill Medical College of Cornell University, Amsterdam, the Netherlands
The International AIDS Vaccine Initiative, New York, NY, USA
Dept. Imm & Microbial Sci and IAVI NAC TSRI, Ragon Institute MIT, USA
The Scripps Research Institute, La Jolla, CA, USA


© Julien et al; licensee BioMed Central Ltd. 2012

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.