The Notch Ligand Delta1 Recruits Dlg1 at Cell-Cell Contacts and Regulates Cell Migration[boxs]

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...

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Bibliographic Details
Published in:The Journal of biological chemistry 2004-12, Vol.279 (53), p.55818-55826
Main Authors: Six, Emmanuelle M., Ndiaye, Delphine, Sauer, Guido, Laâbi, Yacine, Athman, Rafika, Cumano, Ana, Brou, Christel, Israël, Alain, Logeat, Frédérique
Format: Article
Language:English
Subjects:
3T3 Cells
Adaptor Proteins, Signal Transducing
Amino Acid Motifs
Amino Acid Sequence
Animals
Biotinylation
Cell Communication
Cell Differentiation
Cell Line
Cell Movement
Discs Large Homolog 1 Protein
Drosophila
Electrophoresis, Polyacrylamide Gel
Flow Cytometry
Green Fluorescent Proteins - metabolism
Guanylate Kinases
HeLa Cells
Hematopoietic Stem Cells - metabolism
Humans
Immunoblotting
Immunoprecipitation
Intracellular Signaling Peptides and Proteins
Ligands
Mass Spectrometry
Membrane Proteins - chemistry
Membrane Proteins - metabolism
Membrane Proteins - physiology
Mice
Microscopy, Fluorescence
Molecular Sequence Data
Plasmids - metabolism
Protein Binding
Protein Structure, Tertiary
Proteins - chemistry
Proteins - physiology
Receptors, Notch
Sequence Homology, Amino Acid
Transfection
Wound Healing
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Summary: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.
ISSN:0021-9258
1083-351X
DOI:10.1074/jbc.M408022200