The Tek/Tie2 receptor signals through a novel Dok-related docking protein, Dok-R.

Abstract:

:Tek/Tie2 is an endothelial cell-specific receptor tyrosine kinase that has been shown to play a role in vascular development of the mouse. Targeted mutagenesis of both Tek and its agonistic ligand, Angiopoietin-1, result in embryonic lethality, demonstrating that the signal transduction pathway(s) mediated by this receptor are crucial for normal embryonic development. In an attempt to identify downstream signaling partners of the Tek receptor, we have used the yeast two-hybrid system to identify phosphotyrosine-dependent interactions. Using this approach, we have identified a novel docking molecule called Dok-R, which has sequence and structural homology to p62dok and IRS-3. Mapping of the phosphotyrosine-interaction domain within Dok-R shows that Dok-R interacts with Tek through a PTB domain. Dok-R is coexpressed with Tek in a number of endothelial cell lines. We show that coexpression of Dok-R with activated Tek results in tyrosine phosphorylation of Dok-R and that rasGAP and Nck coimmunoprecipitate with phosphorylated Dok-R. Furthermore, Dok-R is constitutively bound to Crk presumably through the proline rich tail of Dok-R. The cloning of Dok-R represents the first downstream substrate of the activated Tek receptor, and suggests that Tek can signal through a multitude of pathways.

journal_name

Oncogene

journal_title

Oncogene

authors

Jones N,Dumont DJ

doi

10.1038/sj.onc.1202115

subject

Has Abstract

pub_date

1998-09-03 00:00:00

pages

1097-108

issue

9

eissn

0950-9232

issn

1476-5594

journal_volume

17

pub_type

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