title: Ligand-dependent perturbation of the conformational ensemble for the GPCR β2 adrenergic receptor revealed by HDX.
abstract: Mechanism of G protein-coupled receptor (GPCR) activation and their modulation by functionally distinct ligands remains elusive. Using the technique of amide hydrogen/deuterium exchange coupled with mass spectrometry, we examined the ligand-induced changes in conformational states and stability within the beta-2-adrenergic receptor (β(2)AR). Differential HDX reveals ligand-specific alterations in the energy landscape of the receptor's conformational ensemble. The inverse agonists timolol and carazolol were found to be most stabilizing even compared with the antagonist alprenolol, notably in intracellular regions where G proteins are proposed to bind, while the agonist isoproterenol induced the largest degree of conformational mobility. The partial agonist clenbuterol displayed conformational effects found in both the inverse agonists and the agonist. This study highlights the regional plasticity of the receptor and characterizes unique conformations spanning the entire receptor sequence stabilized by functionally selective ligands, all of which differ from the profile for the apo receptor.
authors: Department of Molecular Therapeutics, The Scripps Research Institute, Scripps Florida, Jupiter, FL 33458, USA.
authors: Graham M
authors: GM
authors: West
authors: Ellen Y T
authors: EY
authors: Chien
authors: Vsevolod
authors: V
authors: Katritch
authors: Jovylyn
authors: J
authors: Gatchalian
authors: Michael J
authors: MJ
authors: Chalmers
authors: Raymond C
authors: RC
authors: Stevens
authors: Patrick R
authors: PR
authors: Griffin
mesh_terms: D058666:Adrenergic beta-2 Receptor Agonists / Q000378:metabolism; D058672:Adrenergic beta-2 Receptor Antagonists / Q000378:metabolism; D000526:Alprenolol / Q000378:metabolism; D001665:Binding Sites; D002976:Clenbuterol / Q000378:metabolism; D041961:Deuterium Exchange Measurement / Q000379:methods*; D006801:Humans; D006860:Hydrogen Bonding; D008024:Ligands; D013058:Mass Spectrometry; D008566:Membranes / Q000378:metabolism; D010455:Peptides / Q000378:metabolism; D011412:Propanolamines / Q000378:metabolism; D011485:Protein Binding; D055550:Protein Stability; D017434:Protein Structure, Tertiary; D018343:Receptors, Adrenergic, beta-2 / Q000737:chemistry* / Q000378:metabolism; D013999:Timolol / Q000378:metabolism
chemical_list: C553443:ADRB2 protein, human; D058666:Adrenergic beta-2 Receptor Agonists; D058672:Adrenergic beta-2 Receptor Antagonists; D008024:Ligands; D010455:Peptides; D011412:Propanolamines; D018343:Receptors, Adrenergic, beta-2; C014382:carazolol; D013999:Timolol; D000526:Alprenolol; D002976:Clenbuterol