Catalytic activity:ATP + a [protein]-L-tyrosine = ADP + a [protein]-L-tyrosine phosphate. ,Disease:Defects in TEK are a cause of dominantly inherited venous malformations (VMCM) [MIM:600195]; an error of vascular morphogenesis characterized by dilated , serpiginous channels. ,Function:This protein is a protein tyrosine-kinase transmembrane receptor for angiopoietin 1. It may constitute the earliest mammalian endothelial cell lineage marker. Probably regulates endothelial cell proliferation , differentiation and guides the proper patterning of endothelial cells during blood vessel formation. ,similarity:Belongs to the protein kinase superfamily. Tyr protein kinase family. ,similarity:Belongs to the protein kinase superfamily. Tyr protein kinase family. Tie subfamily. ,similarity:Contains 1 protein kinase domain. ,similarity:Contains 2 Ig-like C2-type (immunoglobulin-like) domains. ,similarity:Contains 3 EGF-like domains. ,similarity:Contains 3 fibronectin type-III domains. ,tissue specificity:Predominantly expressed in endothelial cells and their progenitors , the angioblasts. Has been directly found in placenta and lung , with a lower level in umbilical vein endothelial cells , brain and kidney. ,
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