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Related Concept Videos

Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Van der Waals Interactions01:24

Van der Waals Interactions

Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
Intermolecular Forces03:13

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
Intermolecular Forces03:13

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...

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Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates
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Single-Molecule Measurement of Protein Interaction Dynamics Within Biomolecular Condensates

Published on: January 5, 2024

Noncovalent Interaction Analysis in Fluctuating Environments.

Pan Wu1, Robin Chaudret, Xiangqian Hu

  • 1Department of Chemistry, Duke University, Durham, NC 27708.

Journal of Chemical Theory and Computation
|July 30, 2013
PubMed
Summary
This summary is machine-generated.

A new Averaged NonCovalent Interaction (aNCI) index visualizes weak interactions in solution. This method reveals solvation structures and fluctuating patterns crucial for understanding chemical and biological systems.

Keywords:
fluctuating environmenthydrogen bondligand-protein bindingnoncovalent interactionsolvation structure

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Area of Science:

  • Computational chemistry
  • Chemical physics
  • Biochemistry

Background:

  • Noncovalent interactions are fundamental in chemical and biological processes.
  • The original NonCovalent Interaction (NCI) index effectively characterizes weak interactions.
  • Applying NCI analysis to dynamic solution-phase environments presents challenges.

Purpose of the Study:

  • To develop a new computational method for analyzing noncovalent interactions in fluctuating environments.
  • Introduce the Averaged NonCovalent Interaction (aNCI) index and a fluctuation index.
  • Characterize and visualize weak interactions in solution, including solute-solvent and ligand-protein systems.

Main Methods:

  • Development of the Averaged NonCovalent Interaction (aNCI) index.
  • Application of aNCI to various systems: water, benzene in solution, SN2 reactions, and ligand-protein complexes.
  • Visualization of solvation structures, hydrogen bond patterns, and charge reorganization effects.

Main Results:

  • The aNCI index successfully visualized solvation structures and hydrogen bonding for water and benzene molecules.
  • Charge reorganization influences on solvation during the Cl-+CH3Cl SN2 reaction were revealed.
  • Key fluctuating hydrogen bond patterns in ligand-protein systems were identified, relevant for drug design.

Conclusions:

  • The aNCI index provides a complementary approach to the original NCI method for analyzing noncovalent interactions.
  • aNCI effectively extracts and visualizes noncovalent interactions from thermal noise in dynamic environments.
  • This method has potential applications in drug design and understanding complex chemical and biological systems.