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Related Concept Videos

Entropy02:39

Entropy

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Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
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To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Related Experiment Video

Updated: Feb 5, 2026

Measurement of In Vitro Integration Activity of HIV-1 Preintegration Complexes
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Exploring the Reasons for Decrease in Binding Affinity of HIV-2 Against HIV-1 Protease Complex Using Interaction

Yalong Cong1, Yuchen Li1, Kun Jin1

  • 1School of Physics and Electronics, Shandong Normal University, Jinan, China.

Frontiers in Chemistry
|September 11, 2018
PubMed
Summary

This study compares HIV-1 and HIV-2 protease binding with inhibitors using interaction entropy. Findings reveal key differences in binding patterns, offering insights for designing dual-acting HIV protease inhibitors.

Keywords:
HIV proteasebinding free energy calculationinteraction entropymolecular dynamics simulationspolarized force field

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Area of Science:

  • Computational chemistry
  • Molecular dynamics
  • Drug discovery

Background:

  • HIV-1 and HIV-2 proteases exhibit distinct binding characteristics with inhibitors.
  • Understanding these differences is crucial for developing effective antiretroviral therapies.

Purpose of the Study:

  • To analyze and compare binding patterns of HIV-1 and HIV-2 proteases with darunavir and amprenavir.
  • To investigate the role of protonation states in HIV-2 complexes.
  • To elucidate the origins of reduced inhibitor binding affinity in HIV-2 compared to HIV-1.

Main Methods:

  • Utilized the interaction entropy (IE) method for entropy change calculation.
  • Employed a polarized force field for molecular simulations.
  • Analyzed binding free energies and structural parameters (pocket volume, B-factor, flap tip distance).

Main Results:

  • Calculated binding free energies align well with experimental data.
  • Protonation of Asp25' OD1 atom is optimal for HIV-2 complexes.
  • Bridging water W301 favors HIV-1 but disfavors HIV-2 binding.
  • HIV-2 protease exhibits smaller pocket volume and flap tip distances compared to HIV-1.
  • Asp30 residue contributes more favorably to binding in HIV-1 than in HIV-2.

Conclusions:

  • Identified structural and energetic factors contributing to differential inhibitor binding between HIV-1 and HIV-2 proteases.
  • The study provides a theoretical basis for designing dual inhibitors effective against both HIV types.
  • Findings guide future development of more potent antiretroviral drugs.