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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,...
Drug-Receptor Bonds01:25

Drug-Receptor Bonds

Drug-receptor bonds are formed through various chemical forces when drugs interact with target cells. Covalent bonds, strong and irreversible, are exemplified by DNA-alkylating anticancer agents that inhibit cell division. However, such irreversible drug binding lacks selectivity and can modify the DNA of the surrounding healthy cells. Covalent binding often contributes to tissue toxicity, as seen with chloroform and paracetamol metabolites binding to the liver, causing hepatotoxicity.
In...
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.
DNA as a Genetic Template02:05

DNA as a Genetic Template

Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
DNA Packaging00:58

DNA Packaging

Overview

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Related Experiment Video

Updated: May 28, 2026

Studying DNA Looping by Single-Molecule FRET
11:27

Studying DNA Looping by Single-Molecule FRET

Published on: June 28, 2014

Is DNA's rigidity dominated by electrostatic or nonelectrostatic interactions?

Alexey Savelyev1, Christopher K Materese, Garegin A Papoian

  • 1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA.

Journal of the American Chemical Society
|November 2, 2011
PubMed
Summary

DNA

Area of Science:

  • Biophysics
  • Molecular Biology
  • Computational Biology

Background:

  • Double-stranded DNA (dsDNA) is a remarkably stiff biopolymer.
  • Its bending influences critical biological functions.
  • The dominant forces governing DNA rigidity (electrostatic repulsion vs. base pair stacking) remain debated, with conflicting prior research.

Purpose of the Study:

  • To investigate the contributions of electrostatic and base pair stacking forces to DNA rigidity.
  • To resolve conflicting findings from previous theoretical and experimental studies.

Main Methods:

  • Utilized Molecular Dynamics (MD) simulations.
  • Employed both atomistic and coarse-grained force fields for comprehensive analysis.
  • Performed two independent sets of calculations to ensure result validity.

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DNA-magnetic Particle Binding Analysis by Dynamic and Electrophoretic Light Scattering
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DNA-magnetic Particle Binding Analysis by Dynamic and Electrophoretic Light Scattering

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Analyzing and Building Nucleic Acid Structures with 3DNA
16:24

Analyzing and Building Nucleic Acid Structures with 3DNA

Published on: April 26, 2013

Related Experiment Videos

Last Updated: May 28, 2026

Studying DNA Looping by Single-Molecule FRET
11:27

Studying DNA Looping by Single-Molecule FRET

Published on: June 28, 2014

DNA-magnetic Particle Binding Analysis by Dynamic and Electrophoretic Light Scattering
10:35

DNA-magnetic Particle Binding Analysis by Dynamic and Electrophoretic Light Scattering

Published on: November 9, 2017

Analyzing and Building Nucleic Acid Structures with 3DNA
16:24

Analyzing and Building Nucleic Acid Structures with 3DNA

Published on: April 26, 2013

Main Results:

  • Electrostatic and nonelectrostatic (base pair stacking) forces contribute comparably to DNA stiffness.
  • These findings challenge existing theories on DNA rigidity.

Conclusions:

  • A balanced interplay of forces, not a single dominant factor, determines DNA's stiffness.
  • Current theoretical models for DNA rigidity may require revision.
  • Further conceptual development is needed to fully understand DNA's mechanical properties.