Optimization of Molecular Dynamics Simulations of c-MYC^1-88-An Intrinsically Disordered System

Area of Science:

• Structural biology
• Computational biophysics
• Molecular dynamics

Background:

• Many regulatory proteins, including the oncoprotein c-MYC, possess intrinsically disordered regions.
• Over 70% of c-MYC's sequence is disordered, hindering traditional structure-function analysis.
• Computational methods are essential for understanding the conformational dynamics of such proteins.

Purpose of the Study:

• To evaluate different force fields and water models for molecular dynamics simulations of c-MYC's disordered N-terminal region.
• To identify simulation parameters that accurately reflect experimental data.
• To provide insights into the structural dynamics of c-MYC(1-88).

Main Methods:

• Molecular dynamics simulations were performed on the N-terminal 88 amino acids of c-MYC.
• Various force fields and implicit solvation models were tested.
• Simulation-derived secondary structures were compared with experimental Nuclear Magnetic Resonance (NMR) data.

Main Results:

• A specific implicit solvation approach demonstrated high congruence with experimental NMR data.
• The chosen simulation protocol accurately captures aspects of c-MYC(1-88) structural dynamics.
• The study established reliable protocols for analyzing intrinsically disordered protein simulations.

Conclusions:

• Computational molecular dynamics, particularly with the validated implicit solvation model, is a powerful tool for studying intrinsically disordered proteins.
• The findings offer valuable guidance for future experimental studies on c-MYC.
• Developed analysis protocols are broadly applicable to intrinsically disordered protein simulations.