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Related Concept Videos

Susceptibility, Permittivity and Dielectric Constant01:26

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When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Two-dimensional gel electrophoresis is a high-resolution protein separation method first introduced by O' Farrell and Klose in 1975. This method involves protein separation by two dimensions, mass and charge, making it more accurate than one-dimensional gel electrophoresis.
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The function of proteins depends on their native three-dimensional structure, which is dictated by the amino acid sequence of the specific protein. Folding of the polypeptide chain takes place under specific conditions that energetically favor the folded conformation. In contrast, protein denaturation occurs spontaneously under unfavorable conditions that disrupt the integrity of the folded conformation. Thus, the chemical and physical environment of a protein, such as significant changes in pH...
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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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Related Experiment Video

Updated: Dec 18, 2025

Determination of Protein-ligand Interactions Using Differential Scanning Fluorimetry
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Variations in Proteins Dielectric Constants.

Muhamed Amin1,2,3, Jochen Küpper1,4,5

  • 1Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY Notkestrasse 85 22607 Hamburg Germany.

Chemistryopen
|June 13, 2020
PubMed
Summary
This summary is machine-generated.

Researchers calculated the static dielectric constants for over 150,000 dry proteins using a novel semi-empirical method. Results show a consistent mean dielectric constant, indicating proteins

Keywords:
dielectric constantselectrostatic interactionsmolecular polarizabilitiesproteinssemi-empirical methods

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Differential Scanning Calorimetry &#8212; A Method for Assessing the Thermal Stability and Conformation of Protein Antigen
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Area of Science:

  • Computational chemistry
  • Biophysics
  • Structural biology

Background:

  • Dielectric constants are crucial for understanding protein function and interactions.
  • Previous measurements for dry proteins exist, but a comprehensive calculation across all protein structures was lacking.

Purpose of the Study:

  • To calculate the static dielectric constants for all structures in the Protein Data Bank (PDB) using a new semi-empirical method.
  • To investigate the factors influencing protein dielectric constants, including molecular polarizability, volume, cofactors, and pH.

Main Methods:

  • A new semi-empirical method was employed to calculate molecular polarizabilities.
  • The Clausius-Mossotti relation was used in conjunction with polarizabilities to determine static dielectric constants.
  • Analysis included over 150,000 protein structures from the PDB.

Main Results:

  • The mean static dielectric constant for dry proteins was calculated to be approximately [value] with a low standard deviation of 0.04.
  • A strong correlation between molecular polarizability and protein volume was observed, explaining the low standard deviation.
  • Non-amino acid cofactors can significantly alter the dielectric environment, and dielectric anisotropy was noted within molecules.

Conclusions:

  • The study provides a comprehensive dataset of static dielectric constants for dry proteins.
  • Protein dielectric constants are largely consistent but can be significantly influenced by cofactors.
  • Changes in pH (amino acid protonation states) were found to have a negligible effect on protein dielectric constants.