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Inhibitors of Viral Protein Synthesis01:30

Inhibitors of Viral Protein Synthesis

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Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...
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How Does Darunavir Prevent HIV-1 Protease Dimerization?

Danzhi Huang1, Amedeo Caflisch1

  • 1Department of Biochemistry, University of Zürich , Winterthurerstrasse 190 CH-8057 Zürich, Switzerland.

Journal of Chemical Theory and Computation
|November 24, 2015
PubMed
Summary
This summary is machine-generated.

Darunavir (DRV) inhibits HIV-1 protease (PR) by preventing enzyme dimerization. Molecular dynamics simulations reveal a novel binding mode of DRV to monomeric HIV-1 PR, explaining its high genetic barrier against viral resistance.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Drug Discovery

Background:

  • Darunavir (DRV) is a potent HIV-1 protease (PR) inhibitor.
  • DRV's ability to prevent HIV-1 PR dimerization contributes to a high genetic barrier against viral resistance.
  • The precise mechanism of DRV's dimerization inhibition and its binding to monomeric HIV-1 PR remain unclear.

Purpose of the Study:

  • To elucidate the binding mode(s) of Darunavir (DRV) to monomeric HIV-1 protease (PR).
  • To investigate the structural stability of monomeric HIV-1 PR.
  • To understand the molecular mechanisms underlying DRV's inhibition of HIV-1 PR dimerization.

Main Methods:

  • Multiple molecular dynamics simulations using CHARMM and Amber force fields.
  • Total simulation time of 12 microseconds (11 μs CHARMM, 1 μs Amber) with explicit solvent.
  • Analysis of DRV interactions with monomeric HIV-1 PR residues.

Main Results:

  • The monomer of HIV-1 PR is structurally stable.
  • A major binding mode of DRV to monomeric HIV-1 PR was identified, distinct from binding to the dimeric form.
  • DRV binding is stabilized by hydrophobic interactions and significantly interacts with the flap region (residues 46-55), potentially hindering dimerization.

Conclusions:

  • Molecular dynamics simulations reveal a key binding mode of DRV to monomeric HIV-1 PR.
  • DRV's interaction with the flap region likely inhibits HIV-1 PR dimerization.
  • Dimerization inhibition may be the predominant mechanism for multidrug-resistant HIV-1 strains.