Combining coarse-grained protein models with replica-exchange all-atom molecular dynamics

Area of Science:

• Computational biology
• Biophysics
• Molecular modeling

Background:

• Protein folding is crucial for biological function.
• Accurate simulation of protein folding dynamics is computationally intensive.
• Existing methods face challenges in simulating large, complex protein systems.

Purpose of the Study:

• To develop and validate a novel multiscale simulation protocol for protein folding.
• To enhance the efficiency and accuracy of molecular dynamics simulations.
• To enable high-resolution studies of protein folding dynamics in larger systems.

Main Methods:

• Integration of all-atom simulations with the CABS coarse-grained modeling tool.
• Application of the multiscale protocol to the C-terminal beta hairpin of protein G.
• Utilizing replica-exchange molecular dynamics with OPLS-AA and AMBER99sb force fields.

Main Results:

• The multiscale protocol significantly accelerates system convergence compared to all-atom simulations.
• Analysis of melting curves and native-like conformations demonstrated improved efficiency.
• Secondary structure propagation was effectively captured by the combined method.

Conclusions:

• The proposed multiscale method is an efficient and accurate tool for protein folding studies.
• This approach facilitates high-resolution investigations of protein folding dynamics.
• The protocol shows promise for simulating larger and more complex biological systems.