Journal
CELL
Volume 149, Issue 7, Pages 1514-1524Publisher
CELL PRESS
DOI: 10.1016/j.cell.2012.04.033
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Funding
- G. Harold and Leila Y. Mathers Charitable Foundation
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Receptor tyrosine kinase activity is known to occur in the absence of extracellular stimuli. Importantly, this background level of receptor phosphorylation is insufficient to effect a downstream response, suggesting that strict controls are present and prohibit full activation. Here a mechanism is described in which control of FGFR2 activation is provided by the adaptor protein Grb2. Dimeric Grb2 binds to the C termini of two FGFR2 molecules. This heterotetramer is capable of a low-level receptor transphosphorylation, but C-terminal phosphorylation and recruitment of signaling proteins are sterically hindered. Upon stimulation, FGFR2 phosphorylates tyrosine residues on Grb2, promoting dissociation from the receptor and allowing full activation of downstream signaling. These observations establish a role for Grb2 as an active regulator of RTK signaling.
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