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Related Concept Videos

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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...
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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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Updated: Aug 12, 2025

Analyzing and Building Nucleic Acid Structures with 3DNA
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Rigid Base Biasing in Molecular Dynamics Enables Enhanced Sampling of DNA Conformations.

Aderik Voorspoels1, Jocelyne Vreede2, Enrico Carlon1

  • 1Soft Matter and Biophysics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, 3000 Leuven, Belgium.

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|January 25, 2023
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Summary
This summary is machine-generated.

The RBB-NA algorithm enhances all-atom simulations for nucleic acids by controlling rigid base parameters. This allows deeper exploration of DNA and RNA structures, even under high deformation.

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Area of Science:

  • Computational Biology
  • Biophysics
  • Molecular Dynamics

Background:

  • All-atom simulations offer high resolution for nucleic acid studies but are computationally expensive.
  • Current simulations explore limited conformations due to weak fluctuations within accessible time scales.
  • Understanding nucleic acid mechanics under high deformation requires advanced sampling methods.

Purpose of the Study:

  • Introduce the Rigid Base-pair Bending for Nucleic Acids (RBB-NA) algorithm.
  • Enable control over six rotational and six translational base parameters in simulations.
  • Facilitate advanced sampling of locally deformed nucleic acid structures.

Main Methods:

  • Developed the RBB-NA algorithm as a package within the Open Source Library PLUMED.
  • Utilized biasing potentials to "force" specific values of rotational and translational parameters.
  • Applied the algorithm to all-atom simulations of DNA and RNA molecules.

Main Results:

  • Demonstrated RBB-NA's ability to strongly twist, bend, and buckle DNA.
  • Showed that RBB-NA accurately reproduces unconstrained simulation data and known DNA mechanics.
  • Enabled exploration of anharmonic behavior in highly deformed nucleic acids.

Conclusions:

  • RBB-NA effectively expands the conformational space accessible in nucleic acid simulations.
  • The algorithm is valuable for studying the mechanics of DNA and RNA in high deformation regimes.
  • RBB-NA facilitates deeper insights into the complex behavior of nucleic acids.