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Effect of Urea on G-Quadruplex Stability.

Lusine Aslanyan1, Jordan Ko2, Byul G Kim2

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Urea destabilizes G-quadruplex DNA structures, but salt can counteract this effect. This finding suggests urea can be a tool for studying G-quadruplex thermodynamics, similar to its use with proteins.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • G-quadruplexes are noncanonical DNA structures crucial for gene regulation and cellular processes.
  • Understanding forces stabilizing/destabilizing G-quadruplexes is key to their biological roles and therapeutic targeting.
  • Solute-solvent interactions, including cosolvents like urea, significantly influence nucleic acid stability.

Purpose of the Study:

  • To quantitatively investigate the effect of urea, a known destabilizing cosolvent, on the conformational stability of a telomeric G-quadruplex (Tel22).
  • To explore the potential of urea as an analytical tool for thermodynamic characterization of G-quadruplexes.

Main Methods:

  • Investigated the urea-induced unfolding transition of the Tel22 G-quadruplex using biophysical techniques.
  • Analyzed the influence of varying salt (NaCl) concentrations on urea's destabilizing effects.
  • Compared the normalized urea m-value (per change in solvent-accessible surface area) with other nucleic acid and protein structures.

Main Results:

  • Tel22 undergoes a two-state urea-induced unfolding transition at 20 mM NaCl.
  • Increased salt concentration mitigates the destabilizing effect of urea on Tel22.
  • The normalized urea m-value for Tel22 is comparable to other DNA/RNA structures but significantly higher than for proteins.

Conclusions:

  • Urea can be utilized as a thermodynamic analytical tool for G-quadruplex characterization, analogous to its application in protein studies.
  • Further research on diverse G-quadruplexes (varying sequence, topology, molecularity) is needed to define urea's utility and limitations.
  • Understanding cosolvent effects on G-quadruplex stability is vital for elucidating their role in genomic regulation and developing targeted therapies.