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MO Theory and Covalent Bonding02:40

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The molecular orbital theory describes the distribution of electrons in molecules in a manner similar to the distribution of electrons in atomic orbitals. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital. Mathematically, the linear combination of atomic orbitals (LCAO) generates molecular orbitals. Combinations of in-phase atomic orbital wave functions result in regions with a high probability of electron density, while...
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Related Experiment Video

Updated: Jun 1, 2026

Modeling Ligands into Maps Derived from Electron Cryomicroscopy
09:30

Modeling Ligands into Maps Derived from Electron Cryomicroscopy

Published on: July 19, 2024

A novel ligand-mapping method based on molecular liquid theory.

Takashi Imai1

  • 1Computational Science Research Program, RIKEN, Wako, Saitama 351-0112, Japan. takashi.imai@riken.jp

Current Pharmaceutical Design
|May 31, 2011
PubMed
Summary

A new ligand-mapping method (3D-RISM-LM) uses statistical mechanics to predict binding modes by analyzing ligand-protein interactions in water. This approach enhances fragment-based drug design by identifying weak binding sites.

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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
12:37

Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers

Published on: September 4, 2015

Area of Science:

  • Computational chemistry
  • Biophysics
  • Drug discovery

Background:

  • Accurate prediction of ligand-protein binding is crucial for drug design.
  • Traditional docking methods may not fully account for solvent effects.
  • Fragment-based drug design requires sensitive detection of weak binding interactions.

Purpose of the Study:

  • To review the novel three-dimensional reference interaction site model-based ligand mapping (3D-RISM-LM) method.
  • To highlight its capability in predicting ligand binding modes.
  • To emphasize its utility in fragment-based drug design.

Main Methods:

  • Utilizes the three-dimensional reference interaction site model (3D-RISM), a statistical-mechanical theory of solvation.
  • Employs an all-atom model of a protein in a ligand-water mixture.
  • Determines 3D-spatial distributions of ligand atomic sites around the protein.

Main Results:

  • The 3D-RISM-LM method constructs probable ligand binding modes from spatial distributions.
  • It incorporates the atomic and thermodynamic effects of water on binding affinity via statistical mechanics.
  • Demonstrated sensitivity in detecting weak binding modes of small molecules across protein surfaces.

Conclusions:

  • 3D-RISM-LM offers a novel approach to ligand mapping, integrating solvation effects.
  • The method provides a more comprehensive understanding of ligand-protein interactions.
  • It is particularly promising for advancing fragment-based drug design strategies.