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J. Biol. Chem., Vol. 277, Issue 30, 27545-27552, July 26, 2002
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From the Department of Pharmacology and Center for Substance Abuse
Research, Temple University School of Medicine,
Philadelphia, Pennsylvania 19140
We have investigated whether Ezrin-radixin-moesin
(ERM)-binding phosphoprotein-50/Na+/H+
exchanger regulatory factor (EBP50/NHERF), a PDZ domain-containing phosphoprotein, is associated with the human
Ezrin-Radixin-Moesin-binding
Phosphoprotein-50/Na+/H+ Exchanger Regulatory
Factor (EBP50/NHERF) Blocks U50,488H-induced Down-regulation
of the Human
Opioid Receptor by Enhancing Its Recycling
Rate*
opioid receptor (hkor)
and whether it regulates the trafficking and signaling of the hkor.
When expressed in CHO cells stably transfected with the
FLAG-tagged hkor (FLAG-hkor), EBP50/NHERF co-immunoprecipitated with FLAG-hkor, and the PDZ domain I, but not the PDZ domain II, of
EBP50/NHERF was involved in the interaction. Treatment with the
agonist
(
)-(trans)-3,4- dichloro-N-methyl-N-[2-(1-pyrrolidiny)cyclohexyl]benzeneacetamide (U50,488H) enhanced the association of EBP50/NHERF with
FLAG-hkor. Expression of EBP50/NHERF, but not a truncated form lacking
the ERM-binding domain, abolished U50,488H-induced down-regulation of
FLAG-hkor, which was apparently due to an increase in the recycling rate of internalized receptors. However, expression of EBP50/NHERF did
not affect U50,488H binding affinity and U50,488H-stimulated [35S]guanosine
5'-3-O-(thio)triphosphate binding and p42/p44 MAP kinase activation, nor did it affect U50,488H-induced desensitization and internalization of FLAG-hkor. To determine the motif of FLAG-hkor involved in EBP50/NHERF binding, we generated two mutants, FLAG-hkor-A and FLAG-hkor-EE, in which one Ala or two Glu residues were added to
the C terminus, respectively. Neither FLAG-hkor-A nor FLAG-hkor-EE co-immunoprecipitated with EBP50/NHERF, and U50,488H-induced
down-regulation of FLAG-hkor-A and FLAG-hkor-EE were not affected by
expression of EBP50/NHERF. Thus, EBP50/NHERF binds to the C terminus of
FLAG-hkor and blocks the down-regulation of FLAG-hkor. The C-terminal
sequence of the hkor, NKPV, is distinctly different from the sequence
D(S/T)XL, the optimal C-terminal motif in the
2-adrenergic receptor for EBP50/NHERF binding.
EBP50/NHERF may have a broader binding specificity and may interact
with a subset of G protein-coupled receptors to serve as a recycling
signal for these receptors.
*
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: Dept. of Pharmacology,
Temple University School of Medicine, 3420 N. Broad St., Philadelphia, PA 19140. Tel.: 215-707-4188; Fax: 215-707-7068; E-mail: lliuche@astro.temple.edu.
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