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Sequence-dependent thermodynamics of a coarse-grained DNA model
Petr Šulc1, Flavio Romano, Thomas E Ouldridge
1Rudolf Peierls Centre for Theoretical Physics, University of Oxford, 1 Keble Road, Oxford, OX1 3NP, United Kingdom.
The Journal of Chemical Physics
|October 9, 2012
Summary
We developed a sequence-dependent DNA model to accurately predict melting temperatures and molecular behavior. This enhanced coarse-grained model, implemented in oxDNA, shows good agreement with experimental data for various DNA structures.
Area of Science:
- Computational biology
- Biophysics
- Molecular modeling
Background:
- Coarse-grained models simplify complex molecular systems.
- Previous DNA models used average sequence properties.
- Sequence-specific interactions are crucial for DNA behavior.
Purpose of the Study:
- To develop a sequence-dependent coarse-grained DNA model.
- To parameterize the model using melting temperatures of short DNA duplexes.
- To investigate sequence effects on DNA structure and dynamics.
Main Methods:
- Sequence-dependent parametrization of stacking and base-pairing interactions.
- Histogram reweighting technique to fit parameters to melting temperatures.
- Simulation of various DNA structures including single strands, duplexes, and hairpins.
Main Results:
- The model accurately reproduces melting temperatures for thousands of DNA sequences.
- Demonstrated sequence-dependent effects on DNA fraying, hairpin stability, and force-extension properties.
- Simulations of kissing-loop complexes showed good agreement with experimental data.
Conclusions:
- The sequence-dependent model enhances the predictive power of coarse-grained DNA simulations.
- The oxDNA simulation code provides a valuable tool for studying sequence-specific DNA phenomena.
- This approach offers a robust method for investigating DNA behavior at a molecular level.
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