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J Biol Chem

Title:		Functional expression of heteromeric calcitonin gene-related peptide and adrenomedullin receptors in yeast
Author(s):		Miret JJ; Rakhilina L; Silverman L; Oehlen B;
Address:		"OSI Pharmaceuticals Inc., 777 Old Saw Mill River Road, Tarrytown, NY 10591-6705, USA"
Journal Title:		J Biol Chem
Year:		2002
Volume:		20011203
Issue:		9
Page Number:		6881 - 6887
DOI:		10.1074/jbc.M107384200
ISSN/ISBN:		0021-9258 (Print) 0021-9258 (Linking)
Abstract:		"The ability of G protein-coupled receptors (GPCRs) to form homo- and heteromeric complexes has important implications for the regulation of cellular events. A notable example of heteromer formation is the interaction of the calcitonin receptor-like receptor (CRLR) with different members of the receptor activity modifying protein (RAMP) family, which results in the formation of two different receptors, a calcitonin gene-related peptide (CGRP) receptor and an adrenomedullin receptor. To analyze the role of RAMPs in determining ligand specificity, we have co-expressed CRLR and RAMP proteins in the yeast Saccharomyces cerevisiae, which provides a null system to study the function of mammalian receptors. Co-expression of RAMP1 and CRLR reconstituted a CGRP receptor that was able to activate the pheromone-signaling pathway with pharmacological properties similar to those observed previously in mammalian cells. Co-expression of CRLR with RAMP2 or RAMP3 resulted in a response with the pharmacological properties of an adrenomedullin receptor. These data indicate that RAMPs are necessary and sufficient to determine ligand specificity of CRLR. Contrary to observations in mammalian cells, the glycosylation of CRLR was not affected by the presence of RAMPs in yeast, indicating that glycosylation of CRLR is not the prime determinant of ligand specificity. The first functional reconstitution of a heteromeric seven transmembrane receptor in yeast suggests this organism as a useful research tool to study the molecular nature of other heteromeric receptors"
Keywords:		"Animals Calcitonin Gene-Related Peptide/*biosynthesis/*chemistry Calcitonin Receptor-Like Protein Cloning, Molecular Cyclic AMP/metabolism DNA, Complementary/metabolism Dimerization Dose-Response Relationship, Drug Gene Library Glycosylation Humans Intrac;"
Notes:		"MedlineMiret, Juan J Rakhilina, Larissa Silverman, Lauren Oehlen, Bert eng 2001/12/26 J Biol Chem. 2002 Mar 1; 277(9):6881-7. doi: 10.1074/jbc.M107384200. Epub 2001 Dec 3"