GRB7

The product of this gene belongs to a small family of adapter proteins that are known to interact with a number of receptor tyrosine kinases and signaling molecules. This gene encodes a growth factor receptor-binding protein that interacts with epidermal growth factor receptor (EGFR) and ephrin receptors. The protein plays a role in the integrin signaling pathway and cell migration by binding with focal adhesion kinase (FAK). Several transcript variants encoding two different isoforms have been found for this gene. [provided by RefSeq, Jun 2011]

Full Name

Growth Factor Receptor Bound Protein 7

Function

Adapter protein that interacts with the cytoplasmic domain of numerous receptor kinases and modulates down-stream signaling. Promotes activation of down-stream protein kinases, including STAT3, AKT1, MAPK1 and/or MAPK3. Promotes activation of HRAS. Plays a role in signal transduction in response to EGF. Plays a role in the regulation of cell proliferation and cell migration. Plays a role in the assembly and stability of RNA stress granules. Binds to the 5'UTR of target mRNA molecules and represses translation of target mRNA species, when not phosphorylated. Phosphorylation impairs RNA binding and promotes stress granule disassembly during recovery after cellular stress (By similarity).

Biological Process

Epidermal growth factor receptor signaling pathway Source: ProtInc
Negative regulation of translation Source: UniProtKB
Positive regulation of cell migration Source: UniProtKB
Stress granule assembly Source: UniProtKB

Cellular Location

Cell membrane; Cytoplasm; Focal adhesion; Cytoplasmic granule; Cell projection. Predominantly cytoplasmic. Detected in stress granules, where mRNA is stored under stress conditions.

PTM

Phosphorylated on serine and threonine residues in response to heregulin. Phosphorylated on tyrosine residues by TEK/TIE2. Phosphorylated on tyrosine residues in response to NTN1 signaling. Phosphorylation promotes stress granule disassembly during recovery after cellular stress (By similarity). Phosphorylated on tyrosine residues by PTK2/FAK1, and possibly also other kinases. Phosphorylation is enhanced by activation of receptor kinases. Tyrosine phosphorylation is essential for activation of down-stream protein kinases.