Ab initio determination of coarse-grained interactions in double-stranded DNA

Area of Science:

• Computational Biology
• Molecular Biophysics
• Quantum Chemistry

Background:

• Understanding DNA structure and dynamics is crucial for molecular biology.
• Accurate modeling of nucleotide interactions is computationally challenging.

Purpose of the Study:

• To derive coarse-grained interactions for DNA nucleotides from ab initio calculations.
• To develop a computationally efficient model for simulating DNA dynamics.

Main Methods:

• Utilized ab initio total-energy calculations based on density functional theory (DFT).
• Decomposed interactions into hydrogen bonding, stacking, and backbone contributions.
• Fitted interaction energies to analytical expressions for a two-site nucleotide model.

Main Results:

• The model captures base and sequence specificity in DNA interactions.
• Successfully reproduces the stable B-DNA structure.
• Provides accurate predictions for DNA persistence length.

Conclusions:

• The coarse-grained model offers a computationally tractable approach to simulating DNA.
• Enables realistic probing of DNA dynamics at microsecond and micrometer scales.
• Provides a foundation for studying DNA in diverse biological environments.