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Updated: Jun 27, 2026

CAPRRESI: Chimera Assembly by Plasmid Recovery and Restriction Enzyme Site Insertion
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Stretching chimeric DNA: a test for the putative S-form.

Stephen Whitelam1, Sander Pronk, Phillip L Geissler

  • 1Systems Biology Centre, University of Warwick, Coventry, United Kingdom. swhitelam@lbl.gov

The Journal of Chemical Physics
|December 3, 2008
PubMed
Summary
This summary is machine-generated.

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DNA overstretching, a key phenomenon, shows distinct behaviors in sequences with varied compositions. This study proposes a new experimental test to determine if the hybridized S-DNA form is involved in this overstretching transition.

Area of Science:

  • Biophysics
  • Molecular Biology
  • Statistical Mechanics

Background:

  • Double-stranded DNA (dsDNA) exhibits an 'overstretching' transition at approximately 65 pN, increasing its length by 1.7 times.
  • The precise nature of this overstretched state remains elusive, impacting our understanding of DNA's biological roles and technological uses.
  • Current hypotheses suggest overstretching is either force-induced denaturation or a transition to an elongated, hybridized state known as S-DNA.

Purpose of the Study:

  • To investigate the influence of extreme DNA sequence heterogeneity on the overstretching transition.
  • To develop a theoretical framework for understanding how sequence composition affects DNA mechanical properties.
  • To propose a novel experimental method for distinguishing between proposed models of DNA overstretching.

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Last Updated: Jun 27, 2026

CAPRRESI: Chimera Assembly by Plasmid Recovery and Restriction Enzyme Site Insertion
07:37

CAPRRESI: Chimera Assembly by Plasmid Recovery and Restriction Enzyme Site Insertion

Published on: June 25, 2017

Identification of Functional Protein Regions Through Chimeric Protein Construction
11:39

Identification of Functional Protein Regions Through Chimeric Protein Construction

Published on: January 8, 2019

Associated Chromosome Trap for Identifying Long-range DNA Interactions
14:49

Associated Chromosome Trap for Identifying Long-range DNA Interactions

Published on: April 23, 2011

Main Methods:

  • Development of a statistical mechanical model to simulate DNA overstretching.
  • Inclusion of 'chimeric' DNA sequences with distinct AT compositions in the model.
  • Analysis of force-extension data under varying pulling rates and sequence compositions.

Main Results:

  • Chimeric DNA sequences undergo distinct, spatially segregated transitions during elongation under constant external conditions.
  • The force-extension data exhibit a striking, qualitative dependence on the pulling rate, influenced by the accessibility of the hybridized S-form.
  • Model predictions highlight significant differences in overstretching behavior based on sequence heterogeneity and the potential involvement of S-DNA.

Conclusions:

  • Extreme sequence heterogeneity leads to complex, spatially distinct overstretching transitions in DNA.
  • The observed dependence of force-extension data on pulling rate provides a critical experimental signature.
  • This study offers a testable prediction to experimentally validate or refute the S-DNA model for DNA overstretching.