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Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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Related Experiment Video

Updated: May 14, 2026

Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51
06:24

Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51

Published on: February 13, 2019

Equilibrious strand exchange promoted by DNA conformational switching.

Zhiguo Wu1, Xiao Xie, Puzhen Li

  • 1College of Chemistry and Molecular Sciences, Key Laboratory of Biomedical Polymers of Ministry of Education, Wuhan University, Wuhan, Hubei, P R of China.

Scientific Reports
|January 26, 2013
PubMed
Summary

This study introduces a novel, enzyme-free DNA strand exchange reaction (SER) that utilizes the dynamic equilibrium of G-quadruplex DNA conformations. This method offers sequence specificity without needing ATP, unlike traditional methods.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • DNA Nanotechnology

Background:

  • Traditional DNA strand exchange reactions often rely on nonequilibrium toehold strategies or protein mediation with limited sequence specificity.
  • Intracellular DNA strand exchange typically requires proteins and exhibits low sequence specificity.

Purpose of the Study:

  • To develop a novel, enzyme-free DNA strand exchange reaction (SER) driven by DNA conformational switching.
  • To leverage the dynamic equilibrium between duplex DNA and G-quadruplex (G4) DNA for sequence-specific strand exchange.
  • To demonstrate a new application of G4-DNA properties in DNA strand exchange.

Main Methods:

  • Designed DNA duplexes containing the c-myc sequence, which can form G-quadruplex structures.
  • Utilized the dynamic equilibrium between duplex and G4-DNA states to facilitate homologous single-stranded DNA (ssDNA) exchange.
  • Analyzed the products and kinetics of the SER using polyacrylamide gel electrophoresis (PAGE).
  • Compared the novel SER with RecA-mediated strand exchange.

Main Results:

  • Verified a new, enzyme-free, and sequence-specific DNA strand exchange reaction (SER) driven by DNA conformational switching.
  • Demonstrated that the dynamic equilibrium between duplex and G4-DNA is responsive to homologous ssDNA exchange.
  • Showed that displaced ssDNAs are identical to the homologous invading ssDNAs.
  • Confirmed the SER is ATP-independent.

Conclusions:

  • This work presents a novel strategy for DNA strand exchange utilizing the inherent dynamic equilibrium of G-quadruplex DNA conformations.
  • The developed SER is enzyme-free, sequence-specific, and does not require ATP, offering advantages over existing methods.
  • This highlights a new feature of G-quadruplex DNA and provides a novel approach for DNA manipulation in nanotechnology and molecular biology.