title: Unnatural amino acids as probes of ligand-receptor interactions and their conformational consequences.
abstract: G protein-coupled receptors and ion channels couple a wide range of external stimuli to cellular growth and division, metabolism, motility, and a myriad of intra- and intercellular signaling pathways. G protein-coupled receptors initiate complex, interrelated downstream signaling cascades, whereas rapid ionic flux through channels directly supports membrane excitability and mediates cellular functions through second messengers. Because of these characteristics, these ubiquitous transmembrane proteins are valuable therapeutic targets and have provided fertile ground for the development of leading-edge synthetic and chemical biological approaches. Here we summarize recent advances in the use of site-directed incorporation of unnatural amino acids and chemical probes to study ligand-receptor interactions, determine the location of binding sites, and examine the downstream conformational consequences of ligand binding in G protein-coupled receptors and ion channels.
authors.affiliation: Department of Anesthesiology, Pharmacology and Therapeutics and Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z3.
authors.forename: Stephan A
authors.initials: SA
authors.lastname: Pless
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Ahern
mesh_terms: D000596:Amino Acids / Q000737:chemistry / Q000378:metabolism*; D000818:Animals; D001665:Binding Sites; D006801:Humans; D007473:Ion Channels / Q000737:chemistry / Q000378:metabolism*; D008024:Ligands; D008565:Membrane Proteins / Q000737:chemistry / Q000378:metabolism*; D011487:Protein Conformation; D043562:Receptors, G-Protein-Coupled / Q000737:chemistry / Q000378:metabolism*; D013329:Structure-Activity Relationship
chemical_list: D000596:Amino Acids; D007473:Ion Channels; D008024:Ligands; D008565:Membrane Proteins; D043562:Receptors, G-Protein-Coupled