Conformational Transition Pathways of Epidermal Growth Factor Receptor Kinase Domain from Multiple Molecular Dynamics...

Area of Science:

• Biochemistry
• Computational Biology
• Structural Biology

Background:

• Aberrant activation of the epidermal growth factor receptor (EGFR) is implicated in various cancers, making it a crucial therapeutic target.
• A comprehensive understanding of EGFR's conformational dynamics between active and inactive states is vital for drug development.

Purpose of the Study:

• To investigate the transition pathways of the EGFR kinase domain during activation and inactivation.
• To compare distinct conformational change pathways and identify key molecular events.

Main Methods:

• Utilized a combination of multiply targeted molecular dynamics simulations and unbiased molecular dynamics simulations.
• Employed Bayesian clustering and free energy surface analysis to identify favorable pathways and intermediate states.
• Designed and explored two distinct pathways between active and inactive EGFR forms.

Main Results:

• Identified an energy-favorable pathway for EGFR conformational transition, alongside an alternative pathway with unique intermediate states.
• Observed the DFG-flip mechanism in both simulated pathways.
• Highlighted the critical role of the Lys745-Glu762 interaction disruption and A-loop movement in facilitating the DFG-flip and overall conformational change.

Conclusions:

• The study provides novel insights into the complex conformational transitions of EGFR.
• Validated the efficacy of the employed computational approach for sampling protein dynamics and comparing pathways.
• The findings offer a foundation for developing more targeted EGFR-based cancer therapies.