Fibroblast growth factor receptor substrate 2 (FRS2), also known as suc-1 associated neurotrophic factor target protein (SNT) exist in two structurally similar forms namely, FRS2a (SNT-1) and FRS-2b (SNT-2). FRS2 is characterized with a consensus myristylation sequence, involved in its recruitment to the cell membrane 4 and a putative phosphotyrosine binding (PTB) domain in its amino-terminus.
Fibroblast growth factors (FGF) receptor substrate (FRS) functions as a lipid-anchored docking protein that is tyrosine phosphorylated and recruited to FGFR upon FGF stimulation. fibroblast growth factor receptor substrate 2 (FRS2) plays an important role in linking fibroblast growth factor (FGF) and nerve growth factor (NGF) with the Ras/ mitogen-activated protein kinases (MAPKs) signaling pathway, thus relaying information from the cell surface to the nucleus. FRS2 proteins are tyrosine phosphorylated in response to activation of the RET receptor, a tyrosine kinase that functions as the signal transducing receptor for the glial cell line-derived neurotrophic factor (GDNF).
