Abstract
The biological effects of hepatocyte growth factor/scatter factor are mediated by autophosphorylation of its receptor, the Met tyrosine kinase, on two carboxyl-terminal tyrosines. These phosphotyrosines (Y1349VHVNATY1356VNV) are multifunctional docking sites for several effectors. Grb2, the adaptor for the Ras guanyl-nucleotide exchanger SOS, binds to Tyr1356 in the YVNV motif. By site-directed mutagenesis we either abrogated or duplicated the Grb2 consensus, without interfering with the other effectors. Loss of the link with Grb2 severely impaired transformation. The same mutation, however, had no effect on the "scattering" response, indicating that the level of signal which can be reached by Grb2-independent routes is permissive for motility. Duplication of the Grb2 binding site enhanced transformation and left motility unchanged. Thus, two Met-mediated biological responses, motility and growth, can be dissociated on the basis of their differential requirement for a direct link with Ras.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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3T3 Cells
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Adaptor Proteins, Signal Transducing*
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Amino Acid Sequence
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Animals
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Base Sequence
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Blotting, Western
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Calcium-Calmodulin-Dependent Protein Kinases / drug effects
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Calcium-Calmodulin-Dependent Protein Kinases / metabolism
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Cell Line
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Cells, Cultured
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Dogs
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ErbB Receptors / metabolism
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GRB2 Adaptor Protein
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Hepatocyte Growth Factor / pharmacology
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Humans
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Kidney
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Mice
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Molecular Sequence Data
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Mutagenesis, Site-Directed
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Nerve Growth Factors / pharmacology
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Oligodeoxyribonucleotides
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Phosphopeptides / chemistry
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Phosphotyrosine
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Point Mutation
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Proteins / chemistry
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Proteins / isolation & purification
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Proteins / metabolism*
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Proto-Oncogene Proteins c-met
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Rats
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Rats, Inbred F344
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Receptor Protein-Tyrosine Kinases / chemistry
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Receptor Protein-Tyrosine Kinases / isolation & purification
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Receptor Protein-Tyrosine Kinases / metabolism*
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Recombinant Fusion Proteins / chemistry
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Recombinant Fusion Proteins / isolation & purification
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Recombinant Fusion Proteins / metabolism*
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Restriction Mapping
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Transformation, Genetic
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Tumor Cells, Cultured
Substances
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Adaptor Proteins, Signal Transducing
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GRB2 Adaptor Protein
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GRB2 protein, human
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Grb2 protein, mouse
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Grb2 protein, rat
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Nerve Growth Factors
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Oligodeoxyribonucleotides
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Phosphopeptides
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Proteins
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Recombinant Fusion Proteins
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Phosphotyrosine
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Hepatocyte Growth Factor
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ErbB Receptors
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Proto-Oncogene Proteins c-met
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Receptor Protein-Tyrosine Kinases
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Calcium-Calmodulin-Dependent Protein Kinases