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Related Experiment Videos

Sequence dependent effects in methylphosphonate deoxyribonucleotide double and triple helical complexes.

L Kibler-Herzog1, B Kell, G Zon

  • 1Department of Chemistry, Georgia State University, Atlanta 30303-3083.

Nucleic Acids Research
|June 25, 1990
PubMed
Summary

Modified DNA strands with methylphosphonate linkages show sequence-dependent stability differences. Triple helix formation is inhibited when methylphosphonate strands replace normal ones in longer deoxyribonucleotides.

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Area of Science:

  • Oligonucleotide chemistry
  • Biophysical chemistry
  • Molecular biology

Background:

  • Deoxyribooligonucleotides are crucial for genetic processes.
  • Modifications like methylphosphonate linkages alter DNA properties.
  • Understanding these modifications is key to developing novel nucleic acid applications.

Purpose of the Study:

  • To investigate the stability of DNA complexes with normal and methylphosphonate linkages.
  • To compare duplex and triple helix formation between modified and unmodified strands.
  • To elucidate the impact of methylphosphonate modifications on DNA structural stability.

Main Methods:

  • Synthesis of deoxyribooligonucleotides with phosphodiester and methylphosphonate backbones.
  • Thermal melting studies (Tm analysis) to assess complex stability.

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  • Gel electrophoresis to analyze complex formation and integrity.

    • Main Results:

    • Methylphosphonate modification dramatically impacts DNA complex stability in a sequence-dependent manner.
    • Duplexes with purine methylphosphonate strands showed increased Tm and reduced salt dependence, while pyrimidine methylphosphonate duplexes had reduced Tm and broader melting.
    • Triple helix formation was observed with normal strands but surprisingly inhibited when any strand was modified with methylphosphonate linkages, even at high salt concentrations.

    Conclusions:

    • Methylphosphonate modifications introduce significant sequence-dependent alterations in DNA duplex stability.
    • The formation of triple helical structures is hindered by the incorporation of methylphosphonate linkages in longer oligonucleotides.
    • Steric and electronic effects of methylphosphonate linkages counteract charge repulsion benefits, influencing complex stability.