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Related Concept Videos

Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

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Conformational Evaluation of HIV-1 Trimeric Envelope Glycoproteins Using a Cell-based ELISA Assay
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Trimeric HIV Env provides epitope occlusion mediated by hypervariable loops.

Carlos G Moscoso1, Li Xing1, Jinwen Hui1

  • 1Department of Molecular and Cellular Biology, University of California, Davis, CA 95616.

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|November 15, 2014
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Summary
This summary is machine-generated.

The HIV-1 Env V2 loop influences Env protein structure, potentially aiding broadly neutralizing antibody development. Its location suggests a new mechanism for how HIV hides key epitopes.

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Area of Science:

  • Structural biology
  • Immunology
  • Virology

Background:

  • The human immunodeficiency virus type 1 (HIV-1) Env protein, particularly the gp120 subunit, is crucial for viral entry.
  • Hypervariable loops within gp120, such as V1-V5, are known to undergo conformational changes upon receptor binding.
  • The precise role of these loops in modulating Env structure and antibody accessibility remains incompletely understood.

Purpose of the Study:

  • To investigate the structural impact of the V2 loop on the HIV-1 Env trimer.
  • To elucidate the quaternary arrangement of V2 and V3 loops and their influence on epitope accessibility.
  • To provide a structural basis for understanding epitope occlusion and potential strategies for eliciting broadly neutralizing antibodies.

Main Methods:

  • Structural analysis of full-length HIV-1 Env-based immunogens with and without the V2 loop.
  • Comparison of trimeric diameter and subunit association in different Env constructs.
  • Assessment of gp41 epitope exposure following V2 loop deletion.

Main Results:

  • Full-length Env immunogens with the V2 loop exhibited tighter gp120-gp120 association and a smaller trimeric diameter compared to V2-deleted constructs.
  • A basal quaternary positioning of V2 and V3' loops was observed, suggesting gp120-gp120 interactions independent of gp41.
  • Deletion of V2 led to significant exposure of membrane-proximal gp41 epitopes, supporting its predicted basal location.

Conclusions:

  • The V2 loop plays a critical role in maintaining the structural integrity and quaternary organization of the HIV-1 Env trimer.
  • Hypervariable loops contribute to epitope occlusion through quaternary mechanisms, challenging previous models.
  • These findings offer a new perspective on Env structure, epitope exposure, and rationale for designing immunogens to elicit broadly neutralizing antibodies.