title: Monoubiquitination and endocytosis direct gamma-secretase cleavage of activated Notch receptor.
abstract: Activation of mammalian Notch receptor by its ligands induces TNFalpha-converting enzyme-dependent ectodomain shedding, followed by intramembrane proteolysis due to presenilin (PS)-dependent gamma-secretase activity. Here, we demonstrate that a new modification, a monoubiquitination, as well as clathrin-dependent endocytosis, is required for gamma-secretase processing of a constitutively active Notch derivative, DeltaE, which mimics the TNFalpha-converting enzyme-processing product. PS interacts with this modified form of DeltaE, DeltaEu. We identified the lysine residue targeted by the monoubiquitination event and confirmed its importance for activation of Notch receptor by its ligand, Delta-like 1. We propose a new model where monoubiquitination and endocytosis of Notch are a prerequisite for its PS-dependent cleavage, and discuss its relevance for other gamma-secretase substrates.
authors.affiliation: Unité de Biologie Moléculaire de l'Expression Génique, URA 2582, CNRS, Institut Pasteur, 25 rue du Dr. Roux, 75724 Paris Cedex 15, France.
authors.forename: Neetu
authors.initials: N
authors.lastname: Gupta-Rossi
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Six
authors.forename: Odile
authors.initials: O
authors.lastname: LeBail
authors.forename: Frédérique
authors.initials: F
authors.lastname: Logeat
authors.forename: Patricia
authors.initials: P
authors.lastname: Chastagner
authors.forename: Annie
authors.initials: A
authors.lastname: Olry
authors.forename: Alain
authors.initials: A
authors.lastname: Israël
authors.forename: Christel
authors.initials: C
authors.lastname: Brou
mesh_terms: D000595:Amino Acid Sequence; D053829:Amyloid Precursor Protein Secretases; D000818:Animals; D016282:Aspartic Acid Endopeptidases; D002460:Cell Line; D004705:Endocytosis; D010450:Endopeptidases / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans; D015151:Immunoblotting; D008024:Ligands; D008239:Lysine / Q000737:chemistry; D008565:Membrane Proteins / Q000378:metabolism*; D018613:Microscopy, Confocal; D008856:Microscopy, Fluorescence; D008969:Molecular Sequence Data; D011233:Precipitin Tests; D053764:Presenilin-1; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D051880:Receptors, Notch; D017386:Sequence Homology, Amino Acid; D015398:Signal Transduction; D013997:Time Factors; D014162:Transfection; D025801:Ubiquitin / Q000737:chemistry / Q000378:metabolism*
chemical_list: D008024:Ligands; D008565:Membrane Proteins; C508853:PSEN1 protein, human; D053764:Presenilin-1; D051880:Receptors, Notch; D025801:Ubiquitin; D053829:Amyloid Precursor Protein Secretases; D010450:Endopeptidases; D016282:Aspartic Acid Endopeptidases; C509280:BACE1 protein, human; D008239:Lysine