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Understanding the basis of I50V-induced affinity decrease in HIV-1 protease via molecular dynamics simulations using

Rui Duan1, Raudah Lazim1, Dawei Zhang1

  • 1Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.

Journal of Computational Chemistry
|July 23, 2015
PubMed
Summary
This summary is machine-generated.

The I50V mutation in Human Immunodeficiency Virus (HIV)-1 protease significantly impacts drug resistance, reducing the effectiveness of protease inhibitors (PIs). Molecular dynamics simulations reveal how this mutation affects PI binding, aiding in the development of next-generation anti-HIV drugs.

Keywords:
HIV-1 proteasedrug resistancemutationpolarization

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Area of Science:

  • Biochemistry and Molecular Biology
  • Computational Chemistry
  • Drug Discovery and Development

Background:

  • Human Immunodeficiency Virus (HIV)-1 protease is a critical drug target for Acquired Immune Deficiency Syndrome (AIDS) treatment.
  • Drug resistance mutations, such as I50V, diminish the efficacy of current protease inhibitors (PIs).

Purpose of the Study:

  • To investigate the impact of the I50V mutation on the binding affinity of indinavir and amprenavir to HIV-1 protease.
  • To explore the mechanisms underlying reduced PI binding affinity caused by the I50V mutation.

Main Methods:

  • Utilized molecular dynamics (MD) simulations to analyze the I50V mutation's effect on PI binding.
  • Employed quantum fragmentation and Poisson-Boltzmann solvation models for electron density calculations.
  • Applied the delta restrained electrostatic potential (delta-RESP) method for accurate atomic charge fitting, incorporating polarization effects.

Main Results:

  • MD simulations demonstrated significant agreement with experimental data regarding mutation-induced affinity variations.
  • Quantified changes in binding affinity for HIV-1 protease-drug complexes with the I50V mutation.
  • Identified mechanisms responsible for the decreased binding affinity of PIs in the presence of the I50V mutation.

Conclusions:

  • The study provides crucial insights into the molecular basis of HIV-1 drug resistance.
  • Findings support the rational design of next-generation anti-HIV drugs that overcome resistance mutations.
  • Highlights the utility of advanced computational methods in understanding drug-target interactions and guiding therapeutic development.