Accuracy of current all-atom force-fields in modeling protein disordered states

Area of Science:

• Biophysics
• Computational Biology
• Structural Biology

Background:

• Protein disordered states are vital in biological processes.
• Accurate modeling of these states is essential for understanding their function.

Purpose of the Study:

• To evaluate the accuracy of three molecular dynamics force-fields for disordered peptides.
• To identify the best-performing force-field and potential improvements.

Main Methods:

• Utilized enhanced-sampling Molecular Dynamics (MD) simulations.
• Integrated Nuclear Magnetic Resonance (NMR) data for validation.
• Assessed conformational ensembles generated by different force-fields.

Main Results:

• Force-fields produced distinct conformational ensembles.
• AMBER03w showed the best agreement with experimental NMR data.
• Adding ILDN corrections further improved the agreement between simulations and experiments.

Conclusions:

• AMBER03w, especially with ILDN corrections, is recommended for modeling disordered peptides.
• Accurate force-fields are crucial for characterizing protein disordered states.
• Integration of simulation data with experimental validation is key for reliable results.