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

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Structure of the epidermal growth factor receptor kinase domain alone and in complex with a 4-anilinoquinazoline

Jennifer Stamos1, Mark X Sliwkowski, Charles Eigenbrot

  • 1Department of Protein Engineering, Genentech, Inc., South San Francisco, California 94080, USA.

The Journal of Biological Chemistry
|August 28, 2002
PubMed

Insights

The crystal structure of epidermal growth factor receptor kinase (EGFRK) was determined, revealing its unique active conformation without phosphorylation. This study provides insights into EGFRK

Area of Science:

  • Structural Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Epidermal growth factor receptor (EGFR) family members are unique receptor tyrosine kinases with constitutive kinase activity.
  • Unlike other receptor tyrosine kinases, EGFR does not require phosphorylation within its kinase domain for activity.

Purpose of the Study:

  • To determine the crystal structure of the epidermal growth factor receptor kinase (EGFRK) domain.
  • To investigate the structural basis of EGFRK's constitutive activity and its interaction with the inhibitor erlotinib.
  • To explore the role of the carboxyl-terminal tail in EGFRK structure and function.

Main Methods:

  • X-ray crystallography was used to determine the EGFRK crystal structure to 2.6-A resolution.
  • The structure was solved both in the presence and absence of the EGFRK-specific inhibitor, erlotinib.
  • Analysis of protein-protein interactions and conformational states.

Main Results:

  • The EGFRK activation loop adopts a conformation similar to the phosphorylated active form of the insulin receptor kinase domain, despite lacking phosphorylation.
  • Key residues of a putative dimerization motif were found in close contact with the kinase domain.
  • Significant intermolecular contacts involving the carboxyl-terminal tail were observed, suggesting a role in receptor oligomerization.

Conclusions:

  • EGFRK possesses a unique structural mechanism for its constitutive activity.
  • The inhibitor erlotinib binds to EGFRK, stabilizing its active conformation.
  • The carboxyl-terminal tail plays a crucial role in EGFRK oligomerization and potentially its overall function.

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