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Ultra-Stable RNA-Based Monomolecular Triplexes.

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Researchers discovered that Z-shaped loops can create stable nucleic acid triplexes, enhancing RNA duplex stability and offering potential therapeutic targets against pathogenic RNAs.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Stable nucleic acid triplexes form via Hoogsteen interactions between a third strand (TFO) and a homopurine:homopyrimidine duplex.
  • Conventional triplexes use U-shaped loops and TFOs do not typically enhance duplex stability.
  • Noncanonical quadruplexes utilize Z-shaped loops for high stability.

Purpose of the Study:

  • To investigate if Z-shaped loops can increase triplex stability.
  • To design and characterize novel DNA and RNA triplexes with mixed loop types (U-shaped and Z-shaped).
  • To determine the effect of these novel triplexes on the stability of underlying DNA and RNA duplexes.

Main Methods:

  • Design and synthesis of novel oligonucleotide sequences incorporating Z-shaped loops.
  • Formation and characterization of intramolecular DNA and RNA triplexes.
  • Thermal denaturation studies (melting point analysis) to assess duplex and triplex stability.

Main Results:

  • A novel folding principle was demonstrated using two adjacent GGG segments with an intervening nucleotide forming a Z-shaped loop.
  • Designed DNA and RNA triplexes with one U-shaped and one Z-shaped loop were successfully created.
  • The TFO enhanced the stability of underlying RNA duplexes but not DNA duplexes.
  • Stabilized triplexes unfolded cooperatively above the melting point of the RNA duplex.

Conclusions:

  • Ultrastable Z-looped intramolecular triplexes can form in vitro.
  • This structural motif enhances RNA duplex stability, unlike conventional triplexes.
  • These findings reveal a new structural motif with potential as a therapeutic target against pathogenic RNAs.