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Molecular Pharmacology

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Research ArticleArticle

The Carboxyl Terminus of the Prolactin-Releasing Peptide Receptor Interacts with PDZ Domain Proteins Involved in α-Amino-3-hydroxy-5-methylisoxazole-4-propionic Acid Receptor Clustering

Steven H. S. Lin, Amy C. Arai, Zhiwei Wang, Hans-Peter Nothacker and Olivier Civelli
Molecular Pharmacology November 2001, 60 (5) 916-923; DOI: https://doi.org/10.1124/mol.60.5.916
Steven H. S. Lin
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Amy C. Arai
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Zhiwei Wang
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Hans-Peter Nothacker
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Olivier Civelli
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Abstract

PDZ domain proteins use the PDZ domain binding motif to bind to the C-terminal sequence of membrane proteins to help scaffold them and spatially organize the components of the intracellular signaling machinery. We have identified a sequence at the C terminus of a G protein-coupled receptor, the PrRP receptor, that shares similarities with the C-terminal sequence of α-amino-3-hydroxy-5-methylisoxazole-4-propionic acid receptor (AMPA-R) subunits that interact with PDZ domain proteins. When coexpressed in human embryonic kidney 293 cells, PrRP receptor was able to coimmunoprecipitate the three PDZ domain proteins known to interact with AMPA receptors: glutamate receptor interacting protein (GRIP), AMPA binding protein (ABP), and protein that interacts with C-kinase (PICK1), but not the PDZ domain protein PSD-95, which does not interact with AMPA receptors. These interactions are sequence-selective as determined by mutagenesis. Furthermore, we show that PrRP receptor forms intracellular clusters when coexpressed with PICK1, and that this clustering effect is dependent on the interaction between the PICK1 PDZ domain and the last four amino acids of PrRP receptor. We found that PrRP receptor interaction with GRIP is not protein kinase C-regulated but may be regulated by other unidentified kinase because okadaic acid dramatically reduced GRIP interaction. By in situ hybridization, we show that the PrRP receptor is expressed in neurons that also express these PDZ domain proteins. We thus demonstrate that PrRP receptor interacts with the same PDZ domain proteins as the AMPA-Rs, raising the possibility that these two proteins could be scaffolded together at the synapse. These results may help to gain important insights into PrRP functions within the central nervous system.

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Molecular Pharmacology: 60 (5)
Molecular Pharmacology
Vol. 60, Issue 5
1 Nov 2001
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Research ArticleArticle

The Carboxyl Terminus of the Prolactin-Releasing Peptide Receptor Interacts with PDZ Domain Proteins Involved in α-Amino-3-hydroxy-5-methylisoxazole-4-propionic Acid Receptor Clustering

Steven H. S. Lin, Amy C. Arai, Zhiwei Wang, Hans-Peter Nothacker and Olivier Civelli
Molecular Pharmacology November 1, 2001, 60 (5) 916-923; DOI: https://doi.org/10.1124/mol.60.5.916

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Research ArticleArticle

The Carboxyl Terminus of the Prolactin-Releasing Peptide Receptor Interacts with PDZ Domain Proteins Involved in α-Amino-3-hydroxy-5-methylisoxazole-4-propionic Acid Receptor Clustering

Steven H. S. Lin, Amy C. Arai, Zhiwei Wang, Hans-Peter Nothacker and Olivier Civelli
Molecular Pharmacology November 1, 2001, 60 (5) 916-923; DOI: https://doi.org/10.1124/mol.60.5.916
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