We request support for a program in basic research directed at elucidating at a molecular level the nature and mode of functioning of the Beta-adrenergic receptors for catecholamines. Catecholamines such as norepinephrine and epinephrine are of vital importance in the hormonal control of the entire circulation. These compounds act via stimulation of the membrane-bound enzyme adenylate cyclase which is in turn mediated by binding to specific Beta-adrenergic receptors. Although the impetus to our studies has been the desire to shed light on the basic biochemical processes underlying adrenergic control of the circulation, it has become increasingly clear that the best models for study of the Beta-receptor cyclase system are simple, homogeneous cell populations. Accordingly, much of our work is conducted with such simple model systems. This proposal has three major intimately linked goals, all involving primary focus on the Beta-adrenergic receptor as an approach to gaining increased understanding of the normal and abnormal hormonal control of physiological processes. These goals are: 1) to obtain detailed molecular information about the biochemical nature of the Beta-adrenergic receptor including the complete amino acid sequence as deduced from cDNA clones as well as the sequence of the entire gene; 2) to understand the way in which the receptor functions to translate the binding of an agonist ligand on the outer surface of the cell into activation of the guanine nucleotide regulatory protein and the enzyme adenylate cyclase within the plasma membrane. This will be done by performing reconstitution studies in artificial membranes wherein purified receptor and purified effector components are reunited and their functional interactions studied. 3) To understand the way in which receptor function is regulated both in the plasma membrane, as for example by covalent modification, and at the nuclear level in terms of the rate of transcription of the cellular gene for the receptor. The major focus will be on the problem of desensitization of adenylate cyclase to Beta-adrenergic stimulation. Such desensitization is a common result of the therapeutic application of Beta-adrenergic and other types of agonists. These studies will provide the first comprehensive picture of the mode of functioning of an adenylate cyclase-coupled receptor in which detailed information about receptor structure provides the basis for understanding receptor function and receptor regulation.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Method to Extend Research in Time (MERIT) Award (R37)
Project #
5R37HL016037-16
Application #
3485463
Study Section
Pharmacology A Study Section (PHRA)
Project Start
1976-09-01
Project End
1991-08-31
Budget Start
1988-09-01
Budget End
1989-08-31
Support Year
16
Fiscal Year
1988
Total Cost
Indirect Cost
Name
Duke University
Department
Type
Schools of Medicine
DUNS #
071723621
City
Durham
State
NC
Country
United States
Zip Code
27705
Staus, Dean P; Strachan, Ryan T; Manglik, Aashish et al. (2016) Allosteric nanobodies reveal the dynamic range and diverse mechanisms of G-protein-coupled receptor activation. Nature 535:448-52
Wisler, James W; Harris, Emily M; Raisch, Michael et al. (2015) The role of ?-arrestin2-dependent signaling in thoracic aortic aneurysm formation in a murine model of Marfan syndrome. Am J Physiol Heart Circ Physiol 309:H1516-27
Lefkowitz, Robert J (2015) Inspiring the next generation of physician-scientists. J Clin Invest 125:2905-7
Shukla, Arun K; Westfield, Gerwin H; Xiao, Kunhong et al. (2014) Visualization of arrestin recruitment by a G-protein-coupled receptor. Nature 512:218-222
Tang, Wei; Strachan, Ryan T; Lefkowitz, Robert J et al. (2014) Allosteric modulation of ?-arrestin-biased angiotensin II type 1 receptor signaling by membrane stretch. J Biol Chem 289:28271-83
Kotula, Jonathan W; Sun, Jinpeng; Li, Margie et al. (2014) Targeted disruption of ?-arrestin 2-mediated signaling pathways by aptamer chimeras leads to inhibition of leukemic cell growth. PLoS One 9:e93441
Staus, Dean P; Wingler, Laura M; Strachan, Ryan T et al. (2014) Regulation of ?2-adrenergic receptor function by conformationally selective single-domain intrabodies. Mol Pharmacol 85:472-81
Weiss, Dahlia R; Ahn, SeungKirl; Sassano, Maria F et al. (2013) Conformation guides molecular efficacy in docking screens of activated ?-2 adrenergic G protein coupled receptor. ACS Chem Biol 8:1018-26
Simard, Elie; Kovacs, Jeffrey J; Miller, William E et al. (2013) ?-Arrestin regulation of myosin light chain phosphorylation promotes AT1aR-mediated cell contraction and migration. PLoS One 8:e80532
Shukla, Arun K; Manglik, Aashish; Kruse, Andrew C et al. (2013) Structure of active ?-arrestin-1 bound to a G-protein-coupled receptor phosphopeptide. Nature 497:137-41

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