Proteins
(EGF, EGFR, and Grb2), EGFR component states, and protein–protein
interfaces considered in our computational model. The EGFR ectodomain
is taken to be free or bound to EGF. A cytoplasmic domain of EGFR,
comprising the juxtamembrane region (JM) and kinase domain, is taken
to be locked (i.e., unavailable for interaction) or freed (i.e., available
for interaction). The C-terminal tail of EGFR is taken to contain,
as a simplification, a single docking site for Grb2, which can be
unphosphorylated (Y) and inactive or phosphorylated (pY) and active.