OpenCafeMol With 3SPN.2 DNA Model: GPU Acceleration for Long-Time Coarse-Grained Chromatin Simulations

Area of Science:

• Computational Biology
• Biophysics
• Molecular Dynamics

Background:

• Growing demand for simulating large protein-DNA complexes like chromatin over extended timescales.
• Existing molecular dynamics tools face limitations in simulating such systems efficiently.

Purpose of the Study:

• To extend OpenCafeMol, a GPU-accelerated simulator, to support DNA models (3SPN.2 and 3SPN.2C).
• To enhance the accuracy of DNA-protein interactions and computational efficiency for large-scale simulations.

Main Methods:

• Incorporated 3SPN.2 and 3SPN.2C DNA models into OpenCafeMol.
• Implemented a many-body potential for DNA-protein interactions and a localized scheme for base-pairing/cross-stacking.
• Utilized GPU acceleration for significant speed-ups compared to CPU-based simulations.

Main Results:

• Achieved up to 200-fold speed-up for DNA-only systems and 100-fold for DNA-protein complexes on a single GPU.
• Successfully simulated DNA translocation via segment capture in an archaeal SMC-ScpA complex.
• Observed continuous loop growth and obstacle bypass during DNA translocation.

Conclusions:

• The enhanced OpenCafeMol provides a powerful and efficient platform for long-timescale molecular dynamics of protein-DNA complexes.
• The simulation demonstrated the segment capture mechanism for DNA loop extrusion, offering insights into chromatin organization.
• This work facilitates deeper understanding of complex biological processes involving chromatin dynamics.