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Mol. Cell. Biol., 08 1995, 4553-4561, Vol 15, No. 8
L Kim and TW Wong
The FER gene encodes a cytoplasmic tyrosine kinase with a single SH2 domain
and an extensive amino terminus. In order to understand the cellular
function of the FER kinase, we analyzed the effect of growth factor
stimulation on the phosphorylation and activity of FER. Stimulation of A431
cells and 3T3 fibroblasts with epidermal growth factor or platelet-derived
growth factor results in the phosphorylation of FER and two associated
polypeptides. The associated polypeptides were shown to be the epidermal
growth factor receptor or the platelet- derived growth factor receptor and
a previously identified target, pp120. Since pp120 had previously been
shown to interact with components of the cadherin-catenin complex, these
results implicate FER in the regulation of cell-cell interactions. The
physical association of FER with pp120 was found to be constitutive and was
mediated by a 400-amino-acid sequence in the amino terminus of FER.
Analyses of that sequence revealed that it has the ability to form coiled
coils and that it oligomerizes in vitro. The identification of a coiled
coil sequence in the FER kinase and the demonstration that the sequence
mediates association with a potential substrate suggest a novel mechanism
for signal transduction by cytoplasmic tyrosine kinases.
Copyright © 1995, American Society for Microbiology
The cytoplasmic tyrosine kinase FER is associated with the catenin-like substrate pp120 and is activated by growth factors
Department of Biochemistry, Robert Wood Johnson Medical School, Piscataway, New Jersey 08854, USA.
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