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Related Experiment Videos

pentafluorophenyl-phenyl interactions in biphenyl-DNA.

Alain Zahn1, Christine Brotschi, Christian J Leumann

  • 1Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012 Bern, Switzerland.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|February 17, 2005
PubMed
Summary

Fluorinated biphenyl C-nucleotides enhance DNA duplex stability through entropic effects, primarily driven by dehydration during base stacking. This finding offers insights into unnatural base pair thermodynamics.

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Area of Science:

  • Biochemistry
  • Chemical Biology
  • Oligonucleotide Chemistry

Background:

  • Oligonucleotide duplexes are fundamental in molecular biology and therapeutics.
  • Incorporating unnatural base pairs offers a route to expand DNA's functional repertoire.
  • Hydrophobic base substitutes, like biphenyl (bph) and pentafluorobiphenyl ((5F)bph) C-nucleotides, can form novel interstrand stacking motifs.

Purpose of the Study:

  • To investigate the thermodynamic stability of oligonucleotide duplexes containing biphenyl and pentafluorobiphenyl C-nucleotide analogs.
  • To elucidate the contribution of fluorination and inter-base pair interactions to duplex stability.
  • To explore the driving forces behind the stacking of these unnatural aromatic base pairs.

Main Methods:

  • Synthesis of oligonucleotide duplexes with varying numbers (n=0-4) of biphenyl and pentafluorobiphenyl C-nucleotides.

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  • UV-melting curve analysis to determine melting temperatures (T(m)) and assess duplex stability.
  • Isothermal titration calorimetry (ITC) to obtain thermodynamic parameters (DeltaH, DeltaG) for duplex formation.

    • Main Results:

    • A single pentafluorobiphenyl/(5F)bph pair increased duplex stability by 2.4 K compared to the non-fluorinated biphenyl/bph pair.
    • Mixed biphenyl/(5F)bph pairs exhibited intermediate thermal stability.
    • Additional unnatural aromatic pairs increased T(m) by +3.0-4.4 K/couple.
    • Thermodynamic analysis indicated that fluorinated duplexes have higher stability (DeltaG) due to favorable entropic contributions (DeltaH).

    Conclusions:

    • Pentafluorobiphenyl C-nucleotides enhance DNA duplex stability, with the effect being primarily entropic.
    • The observed stability is consistent with a model dominated by dehydration of aromatic units during base stacking.
    • Van der Waals or electrostatic interactions do not appear to be the dominant forces governing the stability of these modified base pairs.