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Mesoscopic model for DNA G-quadruplex unfolding.

A E Bergues-Pupo1,2,3, I Gutiérrez4, J R Arias-Gonzalez4,5

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Summary
This summary is machine-generated.

We developed a mesoscopic model to simulate DNA G-quadruplexes, revealing key physical interactions. This model accurately predicts unfolding kinetics and offers a new nanoscale paradigm for cellular non-equilibrium processes.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Genomics

Background:

  • Guanine-rich sequences form G-quadruplexes, crucial for gene regulation and chromosome stability.
  • Previous studies relied on computationally expensive all-atom simulations for G-quadruplex mechanical unfolding.

Purpose of the Study:

  • To develop a mesoscopic model for simulating DNA G-quadruplex mechanical and thermal stability.
  • To enable simulations at experimental loading rates, inaccessible to atomistic models.

Main Methods:

  • A mesoscopic model representing nucleotides and central cations as single beads.
  • Single-molecule force-induced unfolding experiments using high-resolution optical tweezers on a telomeric DNA sequence.

Main Results:

  • The model successfully simulated DNA G-quadruplex unfolding at experimental loading rates.
  • Model parameters fitted to experimental data accurately predicted rupture-force kinetics.
  • Results showed good agreement with previous near-equilibrium measurements.

Conclusions:

  • The mesoscopic model provides a powerful tool for studying G-quadruplex stability and dynamics.
  • This approach offers a nanoscale paradigm for understanding non-equilibrium processes in biological systems.
  • The model bridges the complexity gap between nucleic acid and protein structures.