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A more recent version of this article appeared on August 1, 2004
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Submitted on January 16, 2004
Revised on June 2, 2004
Accepted on June 2, 2004
, , 
, , 
*Institute of Pathology, University of Oslo, 0027 Oslo, Norway; Department of Biochemistry, The Norwegian Radium Hospital, 0310 Oslo, Norway
Monitoring Editor: Suzanne Pfeffer
Ligand binding causes the EGF receptor (EGFR) to become ubiquitinated by Cbl upon association with the adaptor protein Grb2. We have investigated the role of ubiquitin and Grb2 in ligand-induced endocytosis of the EGFR. Incubation of cells with EGF on ice caused translocation of Grb2 and Cbl from the cytosol to the rim of coated pits. Grb2 with point mutations in both SH3 domains inhibited recruitment of the EGFR to clathrin coated pits, in a Ras-independent manner. On overexpression of the Cbl-binding protein Sprouty, ubiquitination of the EGFR was inhibited, the EGFR was recruited only to the rim of coated pits, and endocytosis of the EGFR was inhibited. Conjugation-defective ubiquitin similarly inhibited recruitment of EGF-EGFR to clathrin-coated pits. Even though this does not prove that cargo must be ubiquitinated, this indicates the importance of interaction of ubiquitinated protein(s) with proteins harboring ubiquitin interacting domains. We propose that Grb2 mediates transient anchoring of the EGFR to an Eps15-containing molecular complex at the rim of coated pits and that Cbl-induced ubiquitination of the EGFR allows relocation of EGFR from the rim to the center of clathrin coated pits.
These authors contributed equally to this work
Corresponding author. E-mail: i.h.madshus{at}labmed.uio.no
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