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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Birchmeier, W. Hartmann, G. Weidner, K. M. Comoglio, P. M. Naldini, L. Sachs, M. Vigna, E. |
| Description | Author Affiliation: Hartmann G ( Institut für Zellbiologie (Tumorforschung), University of Essen Medical School, Federal Republic of Germany.); |
| Abstract | We recently found that scatter factor (SF), a cell motility factor with a multimodular structure, is identical to hepatocyte growth factor (HGF), a potent mitogen of various cell types. SF/HGF is the ligand of the c-Met receptor tyrosine kinase. Here we used transient expression of naturally occurring and in vitro mutagenized cDNAs of SF/HGF to delineate the protein domains necessary for biological activity and binding to the c-Met receptor. (i) A single-chain SF/HGF resulting from the destruction of the protease cleavage site between heavy and light chain (Arg-494--> Gln) was largely inactive, indicating that proteolytic cleavage is essential for acquisition of the biologically active conformation. (ii) A SF/HGF splice variant encoding a protein with a 5-amino acid deletion in the first kringle domain was as highly active as the wild-type molecule. (iii) The separately expressed light chain (with serine protease homology) was inactive in all assays tested. (iv) The separate heavy chain as well as a naturally occurring splice variant consisting of the N terminus and the first two kringle domains bound the c-Met receptor, stimulated tyrosine auto-phosphorylation, and induced scattering of epithelial cells but not mitogenesis. These data indicate that a functional domain in the N terminus/first two kringle regions of SF/HGF is sufficient for binding to the Met receptor and that this leads to the activation of the downstream signal cascade involved in the motility response. However, the complete SF/HGF protein seems to be required for mitogenic activity. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 23 |
| Volume Number | 89 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1992-01-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Hepatocyte Growth Factor Metabolism Proto-Oncogene Proteins Receptors, Cell Surface Amino Acid Sequence Animals Cell Division Cell Movement Cells, Cultured DNA Genetics DNA Mutational Analysis In Vitro Techniques Molecular Sequence Data Mutagenesis, Site-Directed Phosphotyrosine Protein-Tyrosine Kinases Proto-Oncogene Proteins C-met Recombinant Proteins Structure-Activity Relationship Tyrosine Analogs & Derivatives Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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