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Influence of novel cd4 binding-defective hiv-1 envelope glycoprotein immunogens on neutralizing antibody and t-cell responses in nonhuman primates

Academic Article
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Overview

authors

  • Douagi, I.
  • Forsell, M. N. E.
  • Sundling, C.
  • O'Dell, S.
  • Feng, Yangbo
  • Dosenovic, P.
  • Li, Yuxing
  • Seder, R.
  • Lore, K.
  • Mascola, J. R.
  • Wyatt, Richard
  • Hedestam, G. B. K.

publication date

  • February 2010

journal

  • Journal of Virology  Journal

abstract

  • The high-affinity in vivo interaction between soluble HIV-1 envelope glycoprotein (Env) immunogens and primate CD4 results in conformational changes that alter the immunogenicity of the gp120 subunit. Because the conserved binding site on gp120 that directly interacts with CD4 is a major vaccine target, we sought to better understand the impact of in vivo Env-CD4 interactions during vaccination. Rhesus macaques were immunized with soluble wild-type (WT) Env trimers, and two trimer immunogens rendered CD4 binding defective through distinct mechanisms. In one variant, we introduced a mutation that directly disrupts CD4 binding (368D/R). In the second variant, we introduced three mutations (423I/M, 425N/K, and 431G/E) that disrupt CD4 binding indirectly by altering a gp120 subdomain known as the bridging sheet, which is required for locking Env into a stable interaction with CD4. Following immunization, Env-specific binding antibody titers and frequencies of Env-specific memory B cells were comparable between the groups. However, the quality of neutralizing antibody responses induced by the variants was distinctly different. Antibodies against the coreceptor binding site were elicited by WT trimers but not the CD4 binding-defective trimers, while antibodies against the CD4 binding site were elicited by the WT and the 423I/M, 425N/K, and 431G/E trimers but not the 368D/R trimers. Furthermore, the CD4 binding-defective trimer variants stimulated less potent neutralizing antibody activity against neutralization-sensitive viruses than WT trimers. Overall, our studies do not reveal any potential negative effects imparted by the in vivo interaction between WT Env and primate CD4 on the generation of functional T cells and antibodies in response to soluble Env vaccination.

subject areas

  • AIDS Vaccines
  • Animals
  • Antibodies, Neutralizing
  • Antigens, CD4
  • B-Lymphocytes
  • Binding Sites
  • HIV Antibodies
  • HIV Envelope Protein gp120
  • HIV-1
  • Immunologic Memory
  • Macaca mulatta
  • Models, Molecular
  • Mutagenesis, Site-Directed
  • Protein Binding
  • Protein Structure, Quaternary
  • T-Lymphocytes
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Identity

PubMed Central ID

  • PMC2812383

International Standard Serial Number (ISSN)

  • 0022-538X

Digital Object Identifier (DOI)

  • 10.1128/jvi.01896-09

PubMed ID

  • 19955308
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Additional Document Info

start page

  • 1683

end page

  • 1695

volume

  • 84

issue

  • 4

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