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Molecular and Cellular Biology, October 2004, p. 8981-8993, Vol. 24, No. 20
0270-7306/04/$08.00+0     DOI: 10.1128/MCB.24.20.8981-8993.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Alix/AIP1 Antagonizes Epidermal Growth Factor Receptor Downregulation by the Cbl-SETA/CIN85 Complex

Mirko H. H. Schmidt,1,2 Daniela Hoeller,2 Jiuhong Yu,1 Frank B. Furnari,3,4 Webster K. Cavenee,3,4,5 Ivan Dikic,2 and Oliver Bögler1*

William and Karen Davidson Laboratory of Brain Tumor Biology, Hermelin Brain Tumor Center, Department of Neurosurgery, Henry Ford Hospital, Detroit, Michigan,1 Institute of Biochemistry II, Goethe University Medical School, Frankfurt am Main, Germany,2 San Diego Branch, Ludwig Institute for Cancer Research,3 Department of Medicine and Cancer Center,4 Center for Molecular Genetics, University of California at San Diego, La Jolla, California5

Received 14 March 2004/ Returned for modification 5 April 2004/ Accepted 22 July 2004

The assembly of the Cbl-SETA/CIN85-endophilin complex at the C terminus of the epidermal growth factor receptor (EGFR) following ligand activation mediates its internalization and ubiquitination. We found that the SETA/CIN85-interacting protein Alix/AIP1, which also binds endophilins, modulates this complex. Alix was found to associate indirectly with EGFR, regardless of its activation state, and with {Delta}EGFR, which signals at low intensity and does not bind Cbls or SETA/CIN85. In agreement with this, Alix interaction did not occur via SETA/CIN85. However, SETA/CIN85 and Alix were capable of mutually promoting their interaction with the EGFR. Increasing the level of Alix weakened the interaction between SETA/CIN85 and Cbl and reduced the tyrosine phosphorylation of c-Cbl and the level of ubiquitination of EGFR, SETA/CIN85, and Cbls. This antagonism of the Cbl-SETA/CIN85 complex by Alix was reflected in its diminution of EGFR internalization. In agreement with this, small interfering RNA-mediated knockdown of Alix promoted EGFR internalization and downregulation. It has been suggested that SETA/CIN85 promotes receptor internalization by recruiting endophilins. However, Alix was also capable of increasing the level of endophilin associated with EGFR, implying that this is not sufficient to promote receptor internalization. We propose that Alix inhibits EGFR internalization by attenuating the interaction between Cbl and SETA/CIN85 and by inhibiting Cbl-mediated ubiquitination of the EGFR.

* Corresponding author. Mailing address: William and Karen Davidson Laboratory of Brain Tumor Biology, Hermelin Brain Tumor Center, Department of Neurosurgery, Henry Ford Hospital, 2799 West Grand Blvd., Detroit, MI 48202. Phone: (313) 916-7293. Fax: (425) 732-8379. E-mail: oliver{at}bogler.net.

Molecular and Cellular Biology, October 2004, p. 8981-8993, Vol. 24, No. 20
0022-538X/04/$08.00+0     DOI: 10.1128/MCB.24.20.8981-8993.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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