Cited by 739

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Clathrin-independent endocytosis of ubiquitinated cargos

Sigismund, Sara, Woelk, Tanja, Puri, Claudia, Maspero, Elena, Tacchetti, Carlo, Transidico, Pietro, Di Fiore, Pier Paolo, Polo, Simona·2005·Proceedings of the National Academy of Sciences

Abstract

Plasma membrane receptors can be endocytosed through clathrin-dependent and clathrin-independent pathways. Here, we show that the epidermal growth factor (EGF) receptor (EGFR), when stimulated with low doses of EGF, is internalized almost exclusively through the clathrin pathway, and it is not ubiquitinated. At higher concentrations of ligand, however, a substantial fraction of the receptor is endocytosed through a clathrin-independent, lipid raft-dependent route, as the receptor becomes ubiquitinated. An ubiquitination-impaired EGFR mutant was internalized through the clathrin pathway, whereas an EGFR/ubiquitin chimera, that can signal solely through its ubiquitin (Ub) moiety, was internalized exclusively by the non-clathrin pathway. Non-clathrin internalization of ubiquitinated EGFR depends on its interaction with proteins harboring the Ub-interacting motif, as shown through the ablation of three Ub-interacting motif-containing proteins, eps15, eps15R, and epsin. Thus, eps15s and epsin perform an important function in coupling ubiquitinated cargo to clathrin-independent internalization.

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Metadata

Authors
Sigismund, S., Woelk, T., Puri, C., Maspero, E., Tacchetti, C., Transidico, P., Di Fiore, P. P., & Polo, S.
Affiliations
Istituto FIRC di Oncologia Molecolare, Via Adamello 16, 20139 Milan, Italy; Centre of Cell Oncology and Ultrastructure, Istituto FIRC di Oncologia Molecolare, University of Genoa, Via deToni 14, 16132 Genoa, Italy 16132; European Institute of Oncology, Via Ripamonti 435, 20141 Milan, Italy; and University of Milan, Via di Rudini' 8, 20122 Milan, Italy
Venue
Proceedings of the National Academy of Sciences
Published
2005-02-08
Volume
102
Issue
8
Pages
2760-2765
ISSN
  • 0027-8424
  • 1091-6490
Cited by
739
References
1
Language
en

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