Introduction
Structure
Grb2 is a small protein of 217 residues with a molecular size of about 25 Da and composed of three remarkable domains : a single SH2 (Src Homology 2) domain (60 to 152 pdb) flanked by two conserved SH3 domains (respectively 1 to 58 and 156 to 215 pdb). It has no catalytic domain.
The central SH2 domain binds growth factor receptors (EGFR or PDGFR) or scaffold proteins. It interacts preferentially with a tyrosine phosphorylated sequence with the following motif: pY-X-N-X (X is a hydrophobic residue).
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