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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: Mar 10, 2026

Design and Synthesis of a Reconfigurable DNA Accordion Rack
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DNA intercalation optimized by two-step molecular lock mechanism.

Ali A Almaqwashi1,2, Johanna Andersson3,4, Per Lincoln4

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

Scientific Reports
|December 6, 2016
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Summary

This study reveals a novel DNA intercalation mechanism with high affinity and slow kinetics, offering a new strategy for designing DNA-binding drugs. This molecular lock approach optimizes DNA-ligand interactions for therapeutic potential.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • DNA intercalators have diverse properties and applications in DNA-ligand assemblies.
  • Unconventional intercalation mechanisms can yield high affinity and slow kinetics, desirable for therapeutics.

Purpose of the Study:

  • To investigate the free energy landscape of an unconventional DNA intercalator using single-molecule force spectroscopy.
  • To elucidate a novel two-step binding mechanism involving significant DNA structural rearrangements.

Main Methods:

  • Single-molecule force spectroscopy was employed to probe DNA-ligand interactions.
  • Analysis of the free energy landscape to understand binding thermodynamics and kinetics.

Main Results:

  • A novel two-step intercalation mechanism was identified, involving DNA lengthening and relaxation.
  • The intercalator forms a molecular lock in the intermediate state and requires DNA base pair disruption for final binding.
  • This mechanism results in an optimized combination of high DNA binding affinity and slow kinetics.

Conclusions:

  • The findings suggest a new paradigm for the rational design of DNA intercalators.
  • The unconventional binding mechanism offers potential for developing novel DNA-targeting therapeutics.