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

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Negative co-operativity in the EGF receptor.

¹Washington University School of Medicine, Department of Biochemistry and Molecular Biophysics, 660 So. Euclid, Box 8231, St. Louis, MO 63110, USA. pike@biochem.wustl.edu

Biochemical Society Transactions

|January 21, 2012

Summary

Epidermal growth factor (EGF) binding to its receptor (EGFR) exhibits negative cooperativity, not two distinct binding sites. This finding clarifies receptor behavior and ligand interactions.

Area of Science:

Biochemistry
Molecular Biology
Cell Signaling

Background:

Scatchard analysis of epidermal growth factor (EGF) binding to the epidermal growth factor receptor (EGFR) traditionally suggested two independent binding sites with differing affinities.
This interpretation conflicted with structural data showing symmetrical ligand binding in dimerized EGFR.

Purpose of the Study:

To re-evaluate the binding characteristics of EGF to EGFR.
To reconcile Scatchard plot data with structural insights of EGFR.

Main Methods:

Re-analysis of 125I-EGF binding data using a novel approach.
Integration of binding data with the crystal structure of singly-occupied Drosophila EGFR.

Main Results:

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The heterogeneity observed in EGF-EGFR binding is attributed to negative cooperativity within the receptor dimer.

Negative cooperativity describes how ligand binding to one subunit affects binding to the other within a preformed dimer.

EGF binding is positively linked to EGFR dimer assembly but exhibits negative cooperativity within the dimer.

Conclusions:

The traditional model of two independent EGF binding sites on EGFR is inaccurate.
Negative cooperativity, not distinct sites, explains the observed binding heterogeneity.
Ligand-induced dimerization (linkage) and cooperativity are distinct concepts crucial for understanding EGFR function.