The notch ligand Delta1 recruits Dlg1 at cell-cell contacts and regulates cell migration
| Autor: | Christel Brou, Alain Israël, Emmanuelle Six, Rafika Athman, Yacine Laâbi, Delphine Ndiaye, Ana Cumano, Guido Sauer, Frédérique Logeat |
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| Rok vydání: | 2004 |
| Předmět: |
Amino Acid Motifs
Cell Communication Ligands Biochemistry Mass Spectrometry Discs Large Homolog 1 Protein Mice Cell Movement Receptors Notch Intracellular Signaling Peptides and Proteins Cell migration Cell Differentiation Transfection 3T3 Cells Flow Cytometry Cell biology medicine.anatomical_structure Notch proteins DLG1 Electrophoresis Polyacrylamide Gel Plasmids Protein Binding Guanylate kinase Green Fluorescent Proteins Immunoblotting Molecular Sequence Data Notch signaling pathway Biology 3T3 cells Cell Line medicine Animals Humans Immunoprecipitation Biotinylation Amino Acid Sequence Molecular Biology Adaptor Proteins Signal Transducing Wound Healing Sequence Homology Amino Acid Membrane Proteins Proteins Cell Biology Hematopoietic Stem Cells Protein Structure Tertiary Microscopy Fluorescence Cell culture biology.protein Guanylate Kinases HeLa Cells |
| Zdroj: | The Journal of biological chemistry. 279(53) |
| ISSN: | 0021-9258 |
| Popis: | Delta1 acts as a membrane-bound ligand that interacts with the Notch receptor and plays a critical role in cell fate specification. By using peptide affinity chromatography followed by mass spectrometry, we have identified Dlg1 as a partner of the Delta1 C-terminal region. Dlg1 is a human homolog of the Drosophila Discs large tumor suppressor, a member of the membrane-associated guanylate kinase family of molecular scaffolds. We confirmed this interaction by co-immunoprecipitation experiments between endogenous Dlg1 and transduced Delta1 in a 3T3 cell line stably expressing Delta1. Moreover, we showed that deletion of a canonical C-terminal PDZ-binding motif (ATEV) in Delta1 abrogated this interaction. Delta4 also interacted with Dlg1, whereas Jagged1, another Notch ligand, did not. In HeLa cells, transfected Delta1 triggered the accumulation of endogenous Dlg1 at sites of cell-cell contact. Expression of Delta1 also reduced the motility of 3T3 cells. Finally, deletion of the ATEV motif totally abolished these effects but did not interfere with the ability of Delta1 to induce Notch signaling and T cell differentiation in co-culture experiments. These results point to a new, probably cell-autonomous function of Delta1, which is independent of its activity as a Notch ligand. |
| Databáze: | OpenAIRE |
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