NDLI: Long range effect of mutations on specific conformational changes in the extracellular loop 2 of angiotensin II type 1 receptor.

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Long range effect of mutations on specific conformational changes in the extracellular loop 2 of angiotensin II type 1 receptor.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Unal, Hamiyet Desnoyer, Russell Karnik, Sadashiva S. Jagannathan, Rajaganapathi Bhatnagar, Anushree Tirupula, Kalyan
Description	Author Affiliation: Unal H ( Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195, USA.)
Abstract	The topology of the second extracellular loop (ECL2) and its interaction with ligands is unique in each G protein-coupled receptor. When the orthosteric ligand pocket located in the transmembrane (TM) domain is occupied, ligand-specific conformational changes occur in the ECL2. In more than 90% of G protein-coupled receptors, ECL2 is tethered to the third TM helix via a disulfide bond. Therefore, understanding the extent to which the TM domain and ECL2 conformations are coupled is useful. To investigate this, we examined conformational changes in ECL2 of the angiotensin II type 1 receptor (AT1R) by introducing mutations in distant sites that alter the activation state equilibrium of the AT1R. Differential accessibility of reporter cysteines introduced at four conformation-sensitive sites in ECL2 of these mutants was measured. Binding of the agonist angiotensin II (AngII) and inverse agonist losartan in wild-type AT1R changed the accessibility of reporter cysteines, and the pattern was consistent with ligand-specific 'lid' conformations of ECL2. Without agonist stimulation, the ECL2 in the gain of function mutant N111G assumed a lid conformation similar to AngII-bound wild-type AT1R. In the presence of inverse agonists, the conformation of ECL2 in the N111G mutant was similar to the inactive state of wild-type AT1R. In contrast, AngII did not induce a lid conformation in ECL2 in the loss of function D281A mutant, which is consistent with the reduced AngII binding affinity in this mutant. However, a lid conformation was induced by [Sar(1),Gln(2),Ile(8)] AngII, a specific analog that binds to the D281A mutant with better affinity than AngII. These results provide evidence for the emerging paradigm of domain coupling facilitated by long range interactions at distant sites on the same receptor.
ISSN	00219258
e-ISSN	1083351X
Journal	Journal of Biological Chemistry
Issue Number	1
Volume Number	288
Language	English
Publisher	American Society for Biochemistry and Molecular Biology (United States)
Publisher Date	2013-01-04
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Mutation Receptor, Angiotensin, Type 1 Genetics Animals Biotin Chemistry COS Cells Calcium Metabolism Cercopithecus Aethiops Cysteine Ligands Molecular Conformation Molecular Dynamics Simulation Mutagenesis Protein Conformation Protein Structure, Tertiary Receptors, G-Protein-Coupled Signal Transduction Research Support, N.I.H., Extramural Biochemistry Molecular Biology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Biochemistry Molecular Biology

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