Analysis of FAK-associated signaling pathways in the regulation of cell cycle progression.
Focal adhesion kinase (FAK) is an important mediator of signal transduction pathways initiated by integrins in cell migration, survival and cell cycle regulation. The ability of FAK to mediate integrin signaling in the regulation of cell cycle progression depends on the phosphorylation of Tyr397, which implies a functional significance for ... the formation of FAK signaling complexes with Src, phosphatidylinositol-3-kinase (PI3K) and Grb7. We have previously described a FAK mutant, D395A, that selectively disrupts FAK binding to PI3K, but allows FAK association with Src. Using this mutation in a mislocalized FAK mutant background, we show here that formation of a FAK/PI3K complex is not sufficient for cell cycle progression but the formation of a FAK/Src complex plays an essential role. We also show that mutation of D395 to A disrupted FAK association with Grb7. This suggests that a FAK/Grb7 complex is not involved in the cell cycle regulation either, which is supported by direct analysis of cells expressing a dominant negative Grb7 construct. Finally, we provide evidence that the Src-dependent association of FAK with Grb2 and p130(Cas) are both required for the regulation of cell cycle progression by FAK. Together, these studies identify important FAK downstream signaling pathways in cell cycle regulation.
Mesh Terms:
Adaptor Proteins, Signal Transducing, Amino Acid Substitution, Animals, Binding Sites, Cell Cycle, Cell Division, Cell Line, Crk-Associated Substrate Protein, Focal Adhesion Kinase 1, Focal Adhesion Protein-Tyrosine Kinases, GRB2 Adaptor Protein, GRB7 Adaptor Protein, Humans, Integrins, Mice, Mitogen-Activated Protein Kinase 1, Mitogen-Activated Protein Kinase 3, Mitogen-Activated Protein Kinases, Mutagenesis, Site-Directed, Phosphatidylinositol 3-Kinases, Phosphoproteins, Phosphorylation, Protein-Tyrosine Kinases, Proteins, Retinoblastoma-Like Protein p130, Signal Transduction, Transfection, src-Family Kinases
Adaptor Proteins, Signal Transducing, Amino Acid Substitution, Animals, Binding Sites, Cell Cycle, Cell Division, Cell Line, Crk-Associated Substrate Protein, Focal Adhesion Kinase 1, Focal Adhesion Protein-Tyrosine Kinases, GRB2 Adaptor Protein, GRB7 Adaptor Protein, Humans, Integrins, Mice, Mitogen-Activated Protein Kinase 1, Mitogen-Activated Protein Kinase 3, Mitogen-Activated Protein Kinases, Mutagenesis, Site-Directed, Phosphatidylinositol 3-Kinases, Phosphoproteins, Phosphorylation, Protein-Tyrosine Kinases, Proteins, Retinoblastoma-Like Protein p130, Signal Transduction, Transfection, src-Family Kinases
FEBS Lett.
Date: Dec. 15, 2000
PubMed ID: 11119718
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