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A more recent version of this article appeared on March 1, 2005
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Submitted on September 23, 2004
Revised on December 14, 2004
Accepted on December 22, 2004
Department of Pharmacology, University of Colorado Health Sciences Center, Aurora, CO 80045
Monitoring Editor: Sandra Schmid
Knock-down of Grb2 by RNA interference (RNAi) strongly inhibits clathrin-mediated endocytosis of the EGF receptor (EGFR). To gain insights into the function of Grb2 in EGFR endocytosis, we have generated cell lines in which endogenous Grb2 was replaced by YFP-tagged Grb2 expressed at the physiological level. In these cells Grb2-YFP fully reversed the inhibitory effect of Grb2 knock-down on EGFR endocytosis and moreover, trafficked together with EGFR during endocytosis. Overexpression of Grb2-binding protein, c-Cbl did not restore endocytosis in Grb2-depleted cells. However, EGFR endocytosis was rescued in Grb2-depleted cells by chimeric proteins consisting of the Src Homology (SH) 2 domain of Grb2 fused to c-Cbl. The "knock-down and rescue" analysis revealed that the expression of Cbl-Grb2/SH2 fusions containing RING finger domain of Cbl restores normal ubiquitylation and internalization of the EGFR in the absence of Grb2, consistent with the important role of the RING domain in EGFR endocytosis. In contrast, the carboxyl-terminal domain of Cbl, when attached to Grb2 SH2 domain, had 4-times smaller endocytosis-rescue effect as compared with the RING-containing chimeras. Taken together, the data suggest that the interaction of Cbl carboxyl-terminus with CIN85 has a minor and a redundant role in EGFR internalization. We concluded that Grb2-mediated recruitment of the functional RING domain of Cbl to the EGFR is essential and sufficient to support receptor endocytosis.
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