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The membrane proteins Star and Rhomboid-1 have been genetically defined as the primary regulators of EGF receptor activation in Drosophila, but their molecular mechanisms have been elusive. Both Star and Rhomboid-1 have been assumed to work at the cell surface to control ligand activation. Here, we demonstrate that they control receptor signaling by regulating intracellular trafficking and proteolysis of the ligand Spitz. Star is present throughout the secretory pathway and is required to export Spitz from the endoplasmic reticulum to the Golgi apparatus. Rhomboid-1 is localized in the Golgi, where it promotes the cleavage of Spitz. This defines a novel growth factor release mechanism that is distinct from metalloprotease-dependent shedding from the cell surface.

Type

Journal article

Journal

Cell

Publication Date

19/10/2001

Volume

107

Pages

161 - 171

Keywords

Animals, Biotinylation, Blotting, Western, COS Cells, Drosophila, Drosophila Proteins, Endoplasmic Reticulum, Epidermal Growth Factor, Glycosylation, Golgi Apparatus, Green Fluorescent Proteins, Immunohistochemistry, Ligands, Luminescent Proteins, Membrane Proteins, Microscopy, Fluorescence, Models, Biological, Phosphoproteins, Precipitin Tests, Protein Binding, Protein Structure, Tertiary, Protein Transport, Signal Transduction