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Related Experiment Videos

Molecular modeling studies of a parallel stranded quadruplexes containing a 8-bromoadenosine.

Veronica Esposito1, Antonio Randazzo, Luigi Petraccone

  • 1Dipartimento di Chimica delle Sostanze Naturali, Università degli Studi di Napoli Federico II, Napoli, Italy.

Nucleosides, Nucleotides & Nucleic Acids
|October 27, 2005
PubMed
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Modified DNA sequences with 8-bromoadenosine readily form stable parallel quadruplexes. This bulky substituent forces a specific molecular conformation, stabilizing the DNA structures.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Truncated human telomeric DNA sequences can form parallel stranded quadruplexes.
  • The formation of adenosine-tetrads (A-tetrads) is context-dependent.
  • The role of the glycosidic torsion angle in A-tetrad formation is not fully understood.

Purpose of the Study:

  • To investigate the influence of modified adenosine residues on quadruplex formation.
  • To clarify the relationship between glycosidic torsion angle and A-tetrad stability.
  • To synthesize and analyze modified telomeric DNA oligomers.

Main Methods:

  • Synthesis of modified oligomers d(ABrGGGT) and d(TABrGGGT) containing 8-bromoadenosine.
  • Nuclear Magnetic Resonance (NMR) spectroscopy to analyze quadruplex structures.

Related Experiment Videos

  • Molecular modeling studies to predict conformational effects.

    • Main Results:

    • Both modified oligomers folded into highly symmetric parallel quadruplexes.
    • NMR data confirmed the stability and parallel orientation of the DNA strands.
    • Molecular modeling indicated that 8-bromoadenosine forces a syn conformation of the glycosidic bond.

    Conclusions:

    • A bulky substituent like 8-bromoadenosine can stabilize parallel DNA quadruplexes.
    • The syn conformation of the glycosidic bond, induced by the bromine atom, is key to this stabilization.
    • This finding provides insight into the factors governing A-tetrad formation in DNA quadruplexes.