FRS2

(redirected from FRS2A)

FRS2

A gene on chromosome 12q15 that encodes an adapter protein which links activated FGR and NGF receptors to downstream signalling pathways. FRS2 plays a key role in activating MAP kinases and in phosphorylating  PIK3R1, the regulatory subunit of phosphatidylinositol 3-kinase, in response to ligand-mediated activation of FGFR1. FRS2 modulates signalling via SHC1 by competing with it for a common binding site on NTRK1. It is usually part of heteromultimeric protein complexes, and it is highly expressed in the heart, brain, spleen, lungs, liver, skeletal muscle, kidneys and testes.