Abstract:
:Ufo/Axl belongs to a new family of receptor tyrosine kinases with an extracellular structure similar to that of neural cell adhesion molecules. In order to elucidate intracellular signaling, the cytoplasmic moiety of Ufo/Axl was used to screen an expression library according to the CORT (cloning of receptor targets) method. Three putative Ufo substrates were identified: phospholipase Cgamma1 (PLCgamma), as well as p85alpha and p85beta subunits of phosphatidylinositol 3'-kinase (PI3-kinase). Subsequently, chimeric EGFR/Ufo receptors consisting of the extracellular domains of the epidermal growth factor receptor (EGFR) and the transmembrane and intracellular moiety of Ufo were engineered. Using different far-Western blot analyses and coimmunoprecipitation assays, receptor binding of PLCgamma and p85 proteins as well as GRB2, c-src and lck was examined in vitro and in vivo. Competitive inhibition of substrate binding and mutagenesis experiments with EGFR/Ufo constructs revealed C-terminal tyrosine 821 (EILpYVNMDEG) as a docking site for multiple effectors, namely PLCgamma, p85 proteins, GRB2, c-src and lck. Tyrosine 779 (DGLpYALMSRC) demonstrated an additional, but lower binding affinity for the p85 proteins in vitro. In addition, binding of PLCgamma occurred through tyrosine 866 (AGRpYVLCPST). Moreover, our in vivo data indicate that further direct or indirect binding sites for PLCgamma, GRB2, c-src and lck on the human Ufo receptor may exist.
journal_name
Oncogenejournal_title
Oncogeneauthors
Braunger J,Schleithoff L,Schulz AS,Kessler H,Lammers R,Ullrich A,Bartram CR,Janssen JWdoi
10.1038/sj.onc.1201123subject
Has Abstractpub_date
1997-06-05 00:00:00pages
2619-31issue
22eissn
0950-9232issn
1476-5594journal_volume
14pub_type
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