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High-affinity A/T-rich DNA binding with a dimeric bisbenzamidine.

David Bouzada1, Ananya Paul2, Mateo I Sánchez1

  • 1Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Departamento de Química Orgánica, Universidade de Santiago de Compostela, Santiago de Compostela 15782, Spain.

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|November 19, 2025
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Summary
This summary is machine-generated.

Researchers developed a new DNA minor groove binder by dimerizing a bisbenzamidine agent. This enhanced DNA-binding compound shows increased affinity for A/T-rich sites and higher antileishmanial activity.

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Area of Science:

  • Medicinal Chemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Bisbenzamidine compounds are DNA-binding agents.
  • Targeting DNA minor groove offers therapeutic potential.
  • Enhancing DNA affinity can improve drug efficacy.

Purpose of the Study:

  • To develop a dimerized bisbenzamidine DNA minor groove binder.
  • To investigate the compound's DNA binding affinity and specificity.
  • To evaluate the antileishmanial activity of the novel agent.

Main Methods:

  • Chemical synthesis and dimerization of bisbenzamidine.
  • DNA binding assays to determine affinity and specificity.
  • Nuclear magnetic resonance (NMR) and molecular dynamics (MD) simulations.
  • Antimicrobial assays against Leishmania parasites.

Main Results:

  • Dimerized bisbenzamidine showed over 20-fold enhanced DNA affinity.
  • High affinity was observed for extended A/T-rich DNA sequences.
  • Structural studies revealed minor groove insertion.
  • Increased DNA affinity correlated with enhanced antileishmanial activity.

Conclusions:

  • Dimerization effectively creates an extended DNA minor groove binder.
  • The novel compound exhibits potent antileishmanial activity.
  • Structural insights guide the design of future DNA-targeting agents.