Conformational stability of the epidermal growth factor (EGF) receptor as influenced by glycosylation, dimerization and EGF hormone binding

• Published in: Proteins, structure, function, and bioinformatics Vol. 85; no. 4; pp. 561 - 570
• Main Authors: Taylor, Eric S., Pol‐Fachin, Laercio, Lins, Roberto D., Lower, Steven K.
• Format: Journal Article
• Language: English
• Published: United States Wiley Subscription Services, Inc 01.04.2017
• Subjects: Acetylglucosamine - chemistry; Asparagine - chemistry; Binding; Binding Sites; Cascades; Dimerization; Documents; Dynamic stability; EGF binding; Epidermal growth factor; Epidermal Growth Factor - chemistry; Epidermal growth factor receptors; ErbB; ErbB Receptors - chemistry; Fittings; Glycan; glycoprotein; Glycoproteins; Glycosylation; Humans; Membranes; Molecular dynamics; Molecular Dynamics Simulation; Protein Binding; Protein Interaction Domains and Motifs; Protein Multimerization; Protein Stability; Protein Structure, Secondary; Proteins; Signal processing; Signal transduction; Stability analysis; Structural stability; Thermodynamics; Tyrosine; EGF binding; glycoprotein; ErbB; molecular dynamics
• ISSN: 0887-3585; 1097-0134
• DOI: 10.1002/prot.25220

ABSTRACT The epidermal growth factor receptor (EGFR) is an important transmembrane glycoprotein kinase involved the initiation or perpetuation of signal transduction cascades within cells. These processes occur after EGFR binds to a ligand [epidermal growth factor (EGF)], thus inducing its dimerization and tyrosine autophosphorylation. Previous publications have highlighted the importance of glycosylation and dimerization for promoting proper function of the receptor and conformation in membranes; however, the effects of these associations on the protein conformational stability have not yet been described. Molecular dynamics simulations were performed to characterize the conformational preferences of the monomeric and dimeric forms of the EGFR extracellular domain upon binding to EGF in the presence and absence of N‐glycan moieties. Structural stability analyses revealed that EGF provides the most conformational stability to EGFR, followed by glycosylation and dimerization, respectively. The findings also support that EGF–EGFR binding takes place through a large‐scale induced‐fitting mechanism. Proteins 2017; 85:561–570. © 2016 Wiley Periodicals, Inc.