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Inhibitors of Virion Maturation and Assembly

As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...
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Assessment of Immunologically Relevant Dynamic Tertiary Structural Features of the HIV-1 V3 Loop Crown R2 Sequence by ab initio Folding
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Targeting structural flexibility in HIV-1 protease inhibitor binding.

Viktor Hornak1, Carlos Simmerling

  • 1Stony Brook University, Center for Structural Biology, Stony Brook, NY 11794-5155, USA.

Drug Discovery Today
|February 6, 2007
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Summary

Computational models reveal how HIV-1 protease dynamics enable drug access. Understanding these conformational changes is key to developing new anti-AIDS therapies targeting protease flexibility.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Computational Biology

Background:

  • HIV-1 protease is a critical target for anti-AIDS drug development.
  • Ligand binding is known to induce significant conformational changes in the protease.
  • The dynamic aspects of ligand binding to HIV-1 protease have been under-explored.

Purpose of the Study:

  • To investigate the dynamic behavior of HIV-1 protease during ligand binding.
  • To model the conformational transitions of the protease in atomic detail.
  • To explore how protease dynamics influence inhibitor binding and function.

Main Methods:

  • Development and application of computational models for protease dynamics.
  • Integration of crystallographic and NMR experimental data.
  • Atomic-level modeling of protein conformational transitions.

Main Results:

  • Computational models successfully reproduced experimental observations of protease behavior.
  • Models explained how protease dynamics facilitate ligand access to the binding site.
  • Transitions between three distinct protease conformations were detailed.

Conclusions:

  • Protease dynamics play a crucial role in inhibitor binding and access.
  • Allosteric inhibitor binding may modulate protease flexibility and disrupt its function.
  • Computational modeling provides valuable insights into HIV-1 protease mechanisms for drug design.