Temperature dependence of DNA elasticity: An all-atom molecular dynamics simulation study

Area of Science:

• Biophysics
• Computational Biology
• Materials Science

Background:

• Double-stranded DNA (dsDNA) exhibits complex elastic properties essential for biological functions.
• Understanding DNA's mechanical response to environmental factors like temperature is critical for molecular biology and nanotechnology.

Purpose of the Study:

• To investigate the influence of temperature on the elastic properties of dsDNA, including stretch, bend, twist, and twist-stretch coupling.
• To elucidate the underlying mechanisms governing temperature-dependent changes in dsDNA elasticity using molecular dynamics simulations.

Main Methods:

• All-atom molecular dynamics simulations were employed to model dsDNA behavior across a wide temperature range.
• Analysis of simulation trajectories focused on thermal fluctuations in structural parameters to understand elasticity and coupling mechanisms.

Main Results:

• Bending and twist persistence lengths, along with stretch and twist moduli, were found to decrease linearly with increasing temperature.
• Twist-stretch coupling demonstrated a positive correlation with temperature, enhancing as temperature rises.
• Simulation findings showed good agreement with existing experimental and simulation data.

Conclusions:

• Temperature exerts a significant, predictable influence on the elastic moduli and persistence lengths of dsDNA.
• The observed temperature dependence of dsDNA elasticity and twist-stretch coupling offers insights into DNA behavior in biological systems.
• These findings have implications for advancing DNA nanotechnology and understanding DNA mechanics in vivo.