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Complementary antibody lineages achieve neutralization breadth in an HIV-1 infected elite neutralizer

Journal Article · · PLoS Pathogens
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  1. Univ. of Amsterdam (Netherlands)
  2. The Scripps Research Inst., La Jolla, CA (United States)
  3. Duke Univ., Durham, NC (United States). Medical Center
  4. Harvard Medical School, Boston, MA (United States)
  5. The Scripps Research Inst., La Jolla, CA (United States); International AIDS Vaccine Initiative, New York, NY (United States)
  6. The Scripps Research Inst., La Jolla, CA (United States); MIT and Harvard, Cambridge, MA (United States). Ragon Institute of MGH
  7. Univ. of Amsterdam (Netherlands); Cornell Univ., New York, NY (United States). Weill Medical College

Broadly neutralizing antibodies (bNAbs) have remarkable breadth and potency against most HIV-1 subtypes and are able to prevent HIV-1 infection in animal models. However, bNAbs are extremely difficult to induce by vaccination. Defining the developmental pathways towards neutralization breadth can assist in the design of strategies to elicit protective bNAb responses by vaccination. Here, HIV-1 envelope glycoproteins (Env)-specific IgG+ B cells were isolated at various time points post infection from an HIV-1 infected elite neutralizer to obtain monoclonal antibodies (mAbs). Multiple antibody lineages were isolated targeting distinct epitopes on Env, including the gp120-gp41 interface, CD4-binding site, silent face and V3 region. The mAbs each neutralized a diverse set of HIV-1 strains from different clades indicating that the patient’s remarkable serum breadth and potency might have been the result of a polyclonal mixture rather than a single bNAb lineage. High-resolution cryo-electron microscopy structures of the neutralizing mAbs (NAbs) in complex with an Env trimer generated from the same individual revealed that the NAbs used multiple strategies to neutralize the virus; blocking the receptor binding site, binding to HIV-1 Env N-linked glycans, and disassembly of the trimer. These results show that diverse NAbs can complement each other to achieve a broad and potent neutralizing serum response in HIV-1 infected individuals. Hence, the induction of combinations of moderately broad NAbs might be a viable vaccine strategy to protect against a wide range of circulating HIV-1 viruses.

Research Organization:
SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
2423892
Journal Information:
PLoS Pathogens, Journal Name: PLoS Pathogens Journal Issue: 11 Vol. 18; ISSN 1553-7374
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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