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Related Experiment Videos

CCR5 interactions with the variable 3 loop of gp120.

Kelby B Napier1, Zi-xuan Wang, Stephen C Peiper

  • 1Department of Biochemistry and Molecular Biology, University of Louisville, Louisville, KY 40202, USA.

Journal of Molecular Modeling
|May 25, 2006
PubMed
Summary
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The G-protein coupled receptor CCR5 is crucial for HIV-1 entry. Molecular dynamics simulations reveal the V3 loop of gp120 interacts with CCR5, clarifying the co-receptor binding site for HIV-1.

Area of Science:

  • Structural Biology
  • Computational Biophysics
  • Virology

Background:

  • The G-protein coupled receptor CCR5 acts as a key co-receptor for macrophage-tropic (R5) strains of HIV-1.
  • The precise molecular interactions mediating CCR5 co-receptor activity remain largely uncharacterized.

Purpose of the Study:

  • To elucidate the structural basis of CCR5 co-receptor function in HIV-1 entry.
  • To identify the specific binding sites and interactions between CCR5 and the HIV-1 gp120 V3 loop.

Main Methods:

  • Molecular-dynamics (MD) simulations of CCR5 extracellular domains using a rhodopsin-based homology model.
  • Docking and MD simulations of CCR5 with the gp120 variable 3 (V3) loop to model the functional binding unit.
  • Analysis of alanine mutants to validate simulation findings against experimental data.

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Main Results:

  • The HIV-1 gp120 V3 loop primarily interacts with the amino terminus and the second extracellular loop of CCR5.
  • MD simulations successfully rationalized the activities of CCR5 mutants affecting chemokine binding and co-receptor function.
  • A comprehensive model of the CCR5-gp120-CD4 complex was investigated using computational analysis.

Conclusions:

  • Novel structural insights into the CCR5 co-receptor binding site for HIV-1 have been provided.
  • Computational approaches combined with experimental data offer a powerful strategy for understanding HIV-1 co-receptor utilization.
  • This study advances our understanding of the molecular mechanisms underlying HIV-1 pathogenesis and co-receptor engagement.