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Tethered naphthalene diimide-based intercalators for DNA triplex stabilization.

D A Gianolio1, J M Segismundo, L W McLaughlin

  • 1Department of Chemistry, Merkert Chemistry Center, Boston College, 2609 Beacon Street, Chestnut Hill, MA 02467, USA.

Nucleic Acids Research
|April 25, 2000
PubMed
Summary

Oligodeoxyribonucleotides functionalized with naphthalene diimide (NDI) intercalators demonstrate enhanced stability. These NDI-conjugated oligonucleotides significantly stabilize DNA triplex formation when acting as the third strand.

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Area of Science:

  • Chemical synthesis
  • Oligonucleotide chemistry
  • Biophysical chemistry

Background:

  • Oligodeoxyribonucleotides are crucial in molecular biology and therapeutics.
  • Enhancing the stability of DNA structures like triplexes is a key research area.
  • Naphthalene diimide (NDI) derivatives offer unique intercalating properties.

Purpose of the Study:

  • To synthesize oligodeoxyribonucleotides functionalized with naphthalene diimide (NDI) intercalators.
  • To evaluate the triplex stabilizing properties of these NDI-conjugated oligonucleotides.
  • To investigate the impact of NDI attachment at the 5'- and/or 3'-termini.

Main Methods:

  • Single-step synthesis of NDI intercalator from dianhydride.
  • Attachment of NDI to 5'-terminus via reverse coupling and phosphoramidite chemistry.

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  • Attachment of NDI to 3'-terminus using a tethered amino group.
  • Preparation of NDI-conjugated oligonucleotides at both termini.
  • Thermal denaturation studies to assess triplex stability.

    • Main Results:

    • Successful synthesis of NDI intercalator and its conjugation to oligodeoxyribonucleotides.
    • NDI attachment achieved at the 5'-terminus, 3'-terminus, or both.
    • NDI-conjugated oligonucleotides significantly enhanced the stability of DNA triplexes.
    • The presence of NDI as the third strand markedly increased triplex thermal stability.

    Conclusions:

    • Naphthalene diimide (NDI) functionalization is an effective strategy for stabilizing oligodeoxyribonucleotides.
    • NDI-conjugated oligonucleotides show remarkable potential for enhancing DNA triplex stability.
    • This approach offers a promising avenue for developing novel nucleic acid-based structures and therapeutics.