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Related Experiment Videos

Functional impact of HIV coreceptor-binding site mutations.

Mark J Biscone1, John L Miamidian, John M Muchiri

  • 1Department of Microbiology, University of Pennsylvania, 225 Johnson Pavilion, 3610 Hamilton Walk, Philadelphia, PA 19104, USA.

Virology
|April 25, 2006
PubMed
Summary
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Mutations in the HIV-1 Env bridging sheet region impact coreceptor use and inhibitor susceptibility. These changes affect CXCR4-mediated fusion more than CCR5-mediated fusion, influencing viral entry.

Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • The gp120 subunit of HIV-1 Env protein's bridging sheet region is crucial for interaction with coreceptors CCR5 and CXCR4.
  • Understanding these interactions is key to developing effective HIV-1 entry inhibitors.

Purpose of the Study:

  • To investigate the impact of mutations in the HIV-1 Env bridging sheet region on membrane fusion and inhibitor susceptibility.
  • To determine how these mutations affect coreceptor usage (CCR5, CXCR4, CCR3, CCR8).

Main Methods:

  • Site-directed mutagenesis of the HIV-1 Env bridging sheet region.
  • Assays for membrane fusion, viral entry, and coreceptor usage (CCR5, CXCR4).
  • Evaluation of susceptibility to entry inhibitors (TAK-779, AMD-3100, enfuvirtide).

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Main Results:

  • Mutations in the bridging sheet region had a greater impact on CXCR4-mediated fusion and infection compared to CCR5-mediated processes.
  • Mutations reduced the utilization of alternative coreceptors CCR3 and CCR8.
  • Bridging sheet mutations increased susceptibility to CCR5 inhibitor TAK-779 and CXCR4 ligand AMD-3100.
  • These mutations had minimal effects on membrane fusion rates and enfuvirtide susceptibility.

Conclusions:

  • The HIV-1 Env bridging sheet region is vital for efficient utilization of both major and minor coreceptors.
  • Mutations affecting coreceptor binding and enhancing coreceptor inhibitor susceptibility can influence fusion and enfuvirtide susceptibility in an Env-dependent manner.