Abstract:
:Mouse Developmental Kinase 1 (MDK1) is a receptor tyrosine kinase of the eck/eph subfamily expressed in a variety of tissues during early mouse embryogenesis. To obtain further insight into the function of MDK1, we determined identity and localisation of its physiological ligand(s). Staining whole embryos with fusion proteins between the extracellular domain of MDK1 and human secreted alkaline phosphatase revealed areas of high receptor binding in the caudal mesencephalon, the frontal neocortex and the limb buds. This staining was sensitive to treatment with phosphatidylinositol-specific phospholipase C. Using Scatchard analysis, high affinity binding of Elf-1 (1.7 x 10(-10) M) and B61 (2.2 x 10(-10) M) towards MDK1 could be demonstrated. However, the transmembrane ligand Lerk2 displayed no measurable affinity for MDK1. Elf-1 and B61 bind to the three full-length MDK1 isoforms with similar dissociation constants. Slightly lower affinities were observed for the two truncated receptors MDK1-Tl and MDK1-T2. The activation of MDK1 with Elf-1 or B61 leads to the rapid autophosphorylation of MDK1 as well as tyrosine phosphorylation of an unknown 62 kDa phosphoprotein in Rat1 cells. These findings implicate MDK1 in patterning processes during early mouse embryogenesis and suggest MDK1 involvement in early organogenesis and midbrain development.
journal_name
Oncogenejournal_title
Oncogeneauthors
Ciossek T,Ullrich Adoi
10.1038/sj.onc.1200800subject
Has Abstractpub_date
1997-01-09 00:00:00pages
35-43issue
1eissn
0950-9232issn
1476-5594journal_volume
14pub_type
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