The SIRAH force-field and interactions between short DNA duplexes

TL;DR

This paper uses the coarse-grained SIRAH force field to study interactions between short DNA duplexes, aiming to develop reliable simplified models for DNA nanotechnology simulations.

Contribution

It demonstrates the application of the SIRAH force field to model duplex-duplex interactions, providing insights for creating effective potential models.

Findings

Interaction depends on relative positions and orientations

Salt concentration influences duplex interactions

Results inform development of simplified interaction models

Abstract

In recent years, short DNA duplexes have been studied as an interesting self-assembling system and a building block for DNA-based nanotechnologies. Numerical simulation studies for the determination of the full phase diagram of short duplexes require, as an input ingredient, a simplified but reliable force-field able to capture the main features of duplex-duplex interaction. We used the coarse-grained SIRAH force field in the implicit solvent approximation to study the interaction between two short duplexes of double-strand DNA as a function of the relative positions and orientations and the salt concentration, in the cases of 8 and 20 base pairs. We discuss the consequences of our study to determine new simple but qualitatively reliable model potentials.