A Implementation of the 3SPN.2 and 3SPN.2C coarse-grained molecular model of DNA in OpenMM.
3SPN.2 and 3SPN.2C are DNA coarse-grained forcefields developed by the de Pablo group. Each DNA nucleotide is modelled by 3 beads: one bead for the phosphate, a second one for the sugar and a third one nucleobase. These forcefields were adapted by the Wolynes group to model protein-DNA interactions as a complement for the AWSEM coarse-grained protein forcefield.
Installation of the open3SPN2 repository is available through anaconda.
conda install -c conda-forge open3spn2
For protein-DNA simulations you will also need to install openAWSEM and add the openAWSEM path to the $PYTHONPATH environment variable. In linux you can set the path variables on ~/.bashrc.
export PYTHONPATH=/path/to/openAWSEM:$PYTHONPATH
Further documentation and tutorials are hosted in readthedocs.
Carlos Bueno was supported by the MolSSI Software Fellowship, under the mentorship of Jessica Nash. We thank AMD (Advanced Micro Devices, Inc.) for the donation of high-performance computing hardware and HPC resources. This project is also supported by the Center for Theoretical Biological Physics (NSF Grants PHY-2019745 and PHY-1522550), with additional support from the D.R. Bullard Welch Chair at Rice University (Grant No. C-0016 to PGW).
If you publish any work using the open3SPN2 package, please include the following references:
Open3SPN2 Lu, W., Bueno, C., Schafer, N. P., Moller, J., Jin, S., Chen, X., ... & Wolynes, P. G. (2021). OpenAWSEM with Open3SPN2: A fast, flexible, and accessible framework for large-scale coarse-grained biomolecular simulations. PLoS computational biology, 17(2), e1008308. https://doi.org/10.1371/journal.pcbi.1008308
3SPN.2C Freeman, G. S., Hinckley, D. M., Lequieu, J. P., Whitmer, J. K., & De Pablo, J. J. (2014). Coarse-grained modeling of DNA curvature. Journal of Chemical Physics, 141(16). https://doi.org/10.1063/1.4897649
3SPN.2 Hinckley, D. M., Freeman, G. S., Whitmer, J. K., & De Pablo, J. J. (2013). An experimentally-informed coarse-grained 3-site-per-nucleotide model of DNA: Structure, thermodynamics, and dynamics of hybridization. Journal of Chemical Physics, 139(14). https://doi.org/10.1063/1.4822042