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RNA triplex-to-duplex and duplex-to-triplex conversion induced by coralyne.

Francisco J Hoyuelos1, Begoña García, José M Leal

  • 1Universidad de Burgos, Departamento de Química, 09001 Burgos, Spain. begar@ubu.es.

Physical Chemistry Chemical Physics : PCCP
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Summary

The fluorescent dye coralyne induces significant RNA structural changes in poly(A)2poly(U). Coralyne drives reversible triplex-duplex conversions, influenced by temperature and dye-to-polymer ratios.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Structural Chemistry

Background:

  • Poly(A)2poly(U) is a synthetic RNA polymer with known structural properties.
  • Fluorescent dyes are often used to probe nucleic acid structures.
  • Understanding RNA structural dynamics is crucial for molecular biology.

Purpose of the Study:

  • To investigate the structural impact of the fluorescent dye coralyne on poly(A)2poly(U).
  • To elucidate the mechanism of RNA structural transitions induced by coralyne.

Main Methods:

  • Spectrophotometry
  • Circular Dichroism (CD)
  • Calorimetry
  • Displacement assays
  • Kinetic analyses

Main Results:

  • Coralyne binding induces dramatic structural changes in poly(A)2poly(U).
  • Coralyne promotes triplex-to-duplex and duplex-to-triplex conversions.
  • These conversions follow a temperature-dependent, non-reversible cycle at constant dye/polymer ratios > 1.
  • At room temperature, triplex formation occurs at ratios < 1, and duplex formation at ratios > 1.

Conclusions:

  • Coralyne is a potent modulator of poly(A)2poly(U) structure.
  • The dye's interaction with RNA is highly dependent on concentration and temperature.
  • Coralyne binding offers a novel mechanism for controlling RNA structural states.