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Updated: Sep 1, 2025

Deciphering the Structural Effects of Activating EGFR Somatic Mutations with Molecular Dynamics Simulation
15:05

Deciphering the Structural Effects of Activating EGFR Somatic Mutations with Molecular Dynamics Simulation

Published on: May 20, 2020

8.7K

Mechanistic insight toward EGFR activation induced by ATP: role of mutations and water in ATP binding patterns

Emiliano Laudadio1, Giovanna Mobbili2, Leonardo Sorci1

  • 1Department of Science and Engineering of Matter, Environment and Urban Planning, Marche Polytechnic University, Ancona, Italy.

Journal of Biomolecular Structure & Dynamics
|August 15, 2022
PubMed

Insights

Mutations in epidermal growth factor receptor (EGFR) impact targeted cancer therapy effectiveness. This study reveals how these mutations affect EGFR-ATP binding and conformation, aiding personalized medicine for non-small cell lung cancer (NSCLC).

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Computational Chemistry

Background:

  • Mutations in the epidermal growth factor receptor (EGFR) kinase domain are crucial for targeted therapy in non-small cell lung cancer (NSCLC).
  • Tyrosine kinase inhibitors (TKIs) targeting the ATP binding cleft are less effective due to these mutations, and their precise impact on EGFR-ATP complex stability and conformation remains unclear.

Purpose of the Study:

  • To investigate the effect of EGFR mutations on ATP binding affinity and complex conformation using dynamic docking simulations.
  • To correlate computational findings with experimental Michaelis-Menten constant (Km) values.
  • To elucidate the role of water molecules in modulating ATP affinity in wild-type and mutant EGFR.

Main Methods:

  • Dynamic docking simulations were performed on six different EGFR forms representing various mutation states.
  • ATP binding affinities were calculated and correlated with experimentally determined Km values.
  • Conformational changes, including the movement of the αC-helix and the role of water-mediated hydrogen bonds, were analyzed.

Main Results:

  • A strong correlation was observed between calculated ATP affinities and Km values across different EGFR mutations.
  • ATP binding was found to induce an inward movement of the αC-helix, positioning Lys745 near Glu762, indicating ATP binding as an initial step towards the active state.
  • Water hydrogen bonds and water-bridge networks were identified as critical modulators of ATP affinity, with distinct patterns observed in mutant EGFR forms.

Conclusions:

  • EGFR mutations significantly alter ATP binding patterns and conformational dynamics.
  • Understanding these mutant-specific interactions is vital for guiding the development of more personalized and effective cancer therapies.
  • The findings provide a molecular basis for rational drug design and improved treatment strategies for NSCLC patients.
Keywords:
ATPEpidermal growth factor receptor (EGFR)lung cancermolecular dynamics (MD) simulations

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