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J. Biol. Chem., Vol. 276, Issue 18, 15256-15263, May 4, 2001
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From Identification of protein complexes associated
with the ERBB2/HER2 receptor may help unravel the mechanisms of its
activation and regulation in normal and pathological situations.
Interactions between ERBB2/HER2 and Src homology 2 or phosphotyrosine
binding domain signaling proteins have been extensively studied. We
have identified ERBIN and PICK1 as new binding partners for ERBB2/HER2 that associate with its carboxyl-terminal sequence through a PDZ (PSD-95/DLG/ZO-1) domain. This peptide sequence acts as a dominant retention or targeting basolateral signal for receptors in epithelial cells. ERBIN belongs to the newly described LAP (LRR and PDZ) protein
family, whose function is crucial in non vertebrates for epithelial
homeostasis. Whereas ERBIN appears to locate ERBB2/HER2 to the
basolateral epithelium, PICK1 is thought to be involved in the
clustering of receptors. We show here that ERBIN and PICK1 bind to
ERBB2/HER2 with different mechanisms, and we propose that these
interactions are regulated in cells. Since ERBIN and PICK1 tend to
oligomerize, further complexity of protein networks may participate in
ERBB2/HER2 functions and specificity.
The ERBB2/HER2 Receptor Differentially Interacts with
ERBIN and PICK1 PSD-95/DLG/ZO-1 Domain Proteins*
§,
§¶,
,
,
**, and

U119 INSERM, Molecular Oncology, ** Institut
Paoli-Calmettes, 27 boulevard Leï Roure, 13009 Marseille and
Institut de Biologie et du Développement de Marseille,
Faculté des Sciences de Luminy, Case 907,
13288 Marseille cedex 09, France
*
This work was supported in part by grants from INSERM,
Institute Paoli-Calmettes (to V. O. and D. B.), La Ligue
Contre le Cancer (to D. B. and J.-P. B.), Association
Recherche Contre le Cancer (to A. L. B.), and La
Fondation de France (to J.-P. B.).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.

To whom correspondence should be addressed. Tel.:
33-4-91-75-84-09; Fax: 33-4-91-26-03-64; E-mail:
borg@marseille.inserm.fr.
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