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Stretching Short Sequences of DNA with Constant Force Axial Optical Tweezers
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Twist-stretch relations in nucleic acids.

Marco Zoli1

  • 1School of Science and Technology, University of Camerino, 62032, Camerino, Italy. marco.zoli@unicam.it.

European Biophysics Journal : EBJ
|June 25, 2023
PubMed
Summary
This summary is machine-generated.

Double-stranded RNA and DNA exhibit opposite mechanical behaviors when stretched, a finding explained by a new helical model. This model accurately predicts the twist-stretch properties of both nucleic acid types.

Keywords:
Helical repeatMesoscopic Hamiltonian modelsNucleic acids flexibilityPath integral methodsTwist-stretch relations

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Area of Science:

  • Molecular Biophysics
  • Structural Biology
  • Computational Biology

Background:

  • Nucleic acids (RNA and DNA) are dynamic helical molecules essential for biological functions.
  • Experimental studies reveal distinct twist-stretch responses in double-stranded RNA (dsRNA) and double-stranded DNA (dsDNA) under tension.
  • Understanding these mechanical properties is crucial for comprehending molecular interactions and cellular processes.

Purpose of the Study:

  • To develop a theoretical model explaining the differential mechanical behaviors of dsRNA and dsDNA.
  • To investigate the relationship between molecular structure, base pair fluctuations, and macroscopic helical properties.
  • To computationally predict the twist-stretch response of A-form RNA and B-form DNA fragments.

Main Methods:

  • Development of a three-dimensional mesoscopic Hamiltonian model incorporating radial, bending, and twisting fluctuations of base pairs.
  • Inclusion of key structural features of A-form RNA and B-form DNA helices.
  • Application of path integral techniques to compute average helical repeat as a function of applied load.

Main Results:

  • The model successfully reproduces the opposite twist-stretch patterns observed between dsRNA and dsDNA.
  • Calculated helical repeat and stretching properties for short helical fragments align with experimental data for longer molecules.
  • The model elucidates the role of base pair fluctuations in determining macroscopic mechanical properties.

Conclusions:

  • The developed model provides a unified framework for understanding the distinct mechanical behaviors of dsRNA and dsDNA.
  • Base pair fluctuations significantly influence the twist-stretch response of helical nucleic acids.
  • This work offers insights into the mechanics of nucleic acids at a mesoscopic level, relevant to their biological roles.