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Related Concept Videos

Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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...
Surface Tension01:24

Surface Tension

Surface tension is defined as the force per unit length (γ) acting along the surface of a liquid. It arises due to strong intermolecular forces of attraction. A molecule located inside the bulk of the liquid is surrounded by other molecules and experiences equal forces in all directions. However, a molecule at the surface experiences unbalanced forces because there are more neighboring molecules below than above. This creates a net inward force that pulls surface molecules toward the interior,...
Surface Tension of Fluid01:22

Surface Tension of Fluid

Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...
Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
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Solubility03:00

Solubility

Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
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Published on: January 16, 2016

Protein surface dynamics: interaction with water and small solutes.

Ran Friedman1, Esther Nachliel, Menachem Gutman

  • 1Laser Laboratory for Fast Reactions in Biology, Department of Biochemistry, The George S. Wise Faculty for Life Sciences, Tel Aviv University, Tel Aviv, Israel.

Journal of Biological Physics
|January 25, 2013
PubMed
Summary

Ions rapidly shuttle near protein surfaces, mimicking proton transfer mechanisms. Local electrostatic potentials influence ion behavior, revealing insights into surface charge interactions and molecular dynamics.

Keywords:
ions at interfacemolecular dynamicsprotein-salt interactions

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Area of Science:

  • Biophysics
  • Computational Biology
  • Biochemistry

Background:

  • Proton transfer on protein and membrane surfaces is crucial for biological processes.
  • Previous studies suggested specific residue arrangements facilitate proton shuttling.
  • The exact mechanisms governing surface charge dynamics remain an active area of research.

Purpose of the Study:

  • To investigate the role of local electrostatic potentials in ion dynamics near protein surfaces.
  • To explore similarities between ion shuttling and proton transfer mechanisms.
  • To understand the energetic factors governing ion-protein surface interactions.

Main Methods:

  • Molecular dynamics simulations of a small globular protein (bacterial ribosome S6) in explicit water.
  • Inclusion of sodium (Na+) and chloride (Cl-) ion pairs to model mobile charge dynamics.
  • Analysis of ion trajectories, residence times, and interactions with protein surface domains.

Main Results:

  • Simulations showed rapid ion exchange between the protein surface and bulk solution.
  • Specific protein domains exhibited localized electrostatic potentials that detained ions.
  • Detained ions exhibited rapid shuttling between surface attractor sites.
  • Ion detainment represents an energetic balance between attractive forces and entropy.

Conclusions:

  • Local electrostatic potentials on protein surfaces can significantly influence ion dynamics.
  • The observed ion shuttling behavior near protein surfaces parallels proposed proton transfer mechanisms.
  • This study provides a computational model for understanding surface charge effects in biological systems.