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Investigating DNA hairpin folding, this study quantifies heat capacity changes (ΔCp) for GC and AT base pairs. Findings reveal transition states possess low configurational entropy, supporting funnel-like energy landscape models for nucleic acid hybridization.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Thermodynamics

Background:

  • Nucleic acid hybridization is crucial for biological processes.
  • Enthalpy-entropy compensation effects complicate understanding DNA duplex formation.
  • Heat capacity changes (ΔCp) are key to quantifying these effects.

Purpose of the Study:

  • To investigate DNA hairpin folding thermodynamics and kinetics.
  • To determine heat capacity changes (ΔCp) per base pair for GC and AT bonds.
  • To analyze the role of transition states in nucleic acid folding landscapes.

Main Methods:

  • Utilized a temperature-jump optical trap for experiments.
  • Applied kinetic analysis and the Clausius-Clapeyron equation in force.
  • Studied DNA hairpins with varying stem sequences and loop sizes across a temperature range (5-40°C).

Main Results:

  • Derived ΔCp values of 36 ± 3 cal/(mol K) for GC and 29 ± 3 cal/(mol K) for AT base pairs.
  • Observed similar degrees of freedom arrest upon GC and AT base pair formation.
  • Found transition states have high free energies and low ΔCp values compared to native states.

Conclusions:

  • Transition states exhibit low configurational entropy, aligning with funnel-like energy landscape hypotheses.
  • The study validates general principles in nucleic acid hybridization and folding.
  • ΔCp values of transition states are critical for understanding these processes.