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Related Experiment Videos

Conformational diversity versus nucleic acid triplex stability, a combinatorial study.

E Bernal-Méndez1, C J Leumann

  • 1Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland.

The Journal of Biological Chemistry
|July 7, 2001
PubMed
Summary
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Researchers developed a method to screen third strand oligonucleotides for DNA triple helix stability. Ribocytidines enhance stability, while (deoxy)thymidines and uridines show sequence-dependent effects.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Oligonucleotide Chemistry

Background:

  • DNA triple helix stability is crucial for applications but is poorly predictable with current modification strategies.
  • Previous attempts to enhance stability involved chemical modifications of the third strand's backbone, sugar, or bases.
  • A need exists for methods to rapidly screen diverse oligonucleotide conformations for improved triplex stability.

Purpose of the Study:

  • To develop a method for rapid screening of conformationally diverse third strand oligonucleotides.
  • To identify oligonucleotides with enhanced stability in the parallel pairing motif of DNA triple helices.
  • To define basic rules governing triple helix stability in a conformationally diverse system.

Main Methods:

  • Generation of combinatorial oligonucleotide libraries varying in sugar units (ribose/deoxyribose) at each position.

Related Experiment Videos

  • Affinity chromatography using immobilized DNA target duplexes.
  • Temperature gradient selection to identify stable triple helix-forming oligonucleotides, followed by physicochemical characterization.

    • Main Results:

    • Identified oligonucleotides that form stable triple helices, enabling the definition of stability rules.
    • Ribocytidines in the third strand significantly increase triplex stability compared to deoxyribocytidines.
    • Stability of (deoxy)thymidines and uridines in the third strand is highly dependent on the specific sequence.

    Conclusions:

    • The developed screening method allows for efficient identification of stable third strand oligonucleotides.
    • Incorporation of ribocytidines is a general strategy to enhance DNA triple helix stability.
    • Sequence context plays a critical role in the stability contribution of (deoxy)thymidines and uridines.