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Protein Science, Vol 9, Issue 2 310-324, Copyright © 2000 by The Protein Society

JOURNAL ARTICLE

Characterization of a comparative model of the extracellular domain of the epidermal growth factor receptor

RN Jorissen, VC Epa, HR Treutlein, TP Garrett, CW Ward and AW Burgess
Ludwig Institute for Cancer Research, Royal Melbourne Hospital, Parkville, Victoria, Australia. robert.jorissen@ludwig.edu.au

The Epidermal Growth Factor (EGF) receptor is a tyrosine kinase that mediates the biological effects of ligands such as EGF and transforming growth factor alpha. An understanding of the molecular basis of its action has been hindered by a lack of structural and mutational data on the receptor. We have constructed comparative models of the four extracellular domains of the EGF receptor that are based on the structure of the first three domains of the insulin-like growth factor- 1 (IGF-1) receptor. The first and third domains of the EGF receptor, L1 and L2, are right-handed beta helices. The second and fourth domains of the EGF receptor, S1 and S2, consist of the modules held together by disulfide bonds, which, except for the first module of the S1 domain, form rod-like structures. The arrangement of the L1 and S1 domains of the model are similar to that of the first two domains of the IGF-1 receptor, whereas that of the L2 and S2 domains appear to be significantly different. Using the EGF receptor model and limited information from the literature, we have proposed a number of regions that may be involved in the functioning of the receptor. In particular, the faces containing the large beta sheets in the L1 and L2 domains have been suggested to be involved with ligand binding of EGF to its receptor.
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