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Updated: Jan 24, 2026

Amplifying and Quantifying HIV-1 RNA in HIV Infected Individuals with Viral Loads Below the Limit of Detection by Standard Clinical Assays
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Amplifying and Quantifying HIV-1 RNA in HIV Infected Individuals with Viral Loads Below the Limit of Detection by Standard Clinical Assays

Published on: September 26, 2011

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MxB Restricts HIV-1 by Targeting the Tri-hexamer Interface of the Viral Capsid

Sarah Sierra Smaga1, Chaoyi Xu2, Brady James Summers1

  • 1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520, USA.

Structure (London, England : 1993)
|June 4, 2019
PubMed

Insights

The human antiviral protein MxB inhibits HIV by targeting its capsid. Researchers mapped MxB

Area of Science:

  • Virology
  • Structural Biology
  • Immunology

Background:

  • The human MxB protein acts as a restriction factor against HIV infection.
  • MxB targets the HIV capsid, a crucial protein shell protecting the viral genome.
  • The HIV capsid is formed by CA proteins assembling into hexamer and pentamer lattices.

Purpose of the Study:

  • To elucidate the precise molecular interactions between MxB and the HIV capsid.
  • To identify specific residues involved in MxB binding to the capsid structure.

Main Methods:

  • Biochemical assays
  • Biophysical studies
  • Molecular dynamics simulations

Main Results:

  • MxB recognizes a specific interface formed by three HIV CA hexamers.
  • The interaction site was mapped to a few CA residues within a negatively charged region.
  • Detailed residue-level mapping of the MxB-capsid interaction interface was achieved.

Conclusions:

  • MxB binds to a unique structural feature at the intersection of three CA hexamers.
  • Understanding this interaction provides a basis for designing novel HIV capsid-targeting therapies.
Keywords:
HIVMxBcapsidmolecular dynamicspattern-sensingsimulation

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