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Mechanically manipulating the DNA threading intercalation rate.

Thayaparan Paramanathan1, Fredrik Westerlund, Micah J McCauley

  • 1Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA.

Journal of the American Chemical Society
|March 4, 2008
PubMed
Summary
This summary is machine-generated.

Ruthenium complex DeltaDelta-P needs melted DNA to bind. Applying force to DNA mechanically lowers this melting barrier, enabling faster binding and revealing that only one base pair melt is needed for threading.

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Area of Science:

  • Biophysics
  • Chemical Biology
  • Molecular Biophysics

Background:

  • Ruthenium complexes are investigated for DNA intercalation.
  • DNA melting is a prerequisite for threading of ligands like DeltaDelta-P.
  • Low binding rates are observed in bulk experiments due to rare DNA melting events.

Purpose of the Study:

  • To investigate the mechanical manipulation of DNA melting barriers.
  • To determine the force dependence of DNA threading by DeltaDelta-P.
  • To elucidate the minimum DNA melting requirement for ligand binding.

Main Methods:

  • Single DNA molecule stretching experiments.
  • Applying controlled mechanical force to DNA.
  • Measuring binding rates of DeltaDelta-P to DNA under force.

Main Results:

  • Single DNA molecule stretching reduces the barrier to DNA melting.
  • The rate of DNA threading by DeltaDelta-P shows exponential dependence on applied force.
  • Binding rate is directly correlated with mechanical force, consistent with theoretical models.

Conclusions:

  • Mechanical force can be used to control ligand binding to DNA.
  • Only a single base pair transiently melted is sufficient for DNA threading by DeltaDelta-P.
  • This study provides insights into DNA-ligand interactions and mechanical control.