title: Molecular biology of serotonin (5-HT) receptors.
abstract: The recent cloning of three types of 5-hydroxytryptamine (5-HT, serotonin) receptors substantiates radioligand-based definitions of 5-HT receptors, and provides a framework in which to understand the function and evolution of the receptors. The primary sequences determined by molecular cloning of the 5-HT1c, 5-HT1a and 5-HT2 receptors place each of these 5-HT receptor subtypes into the class of G protein-coupled receptors. These receptors all share similar functional and structural features. Each receptor is positioned in the lipid bilayer with seven membrane-spanning domains and corresponding intracellular and extracellular domains. By analogy to the known functional structures of the beta-adrenergic receptor, the binding site of 5-HT is proposed to be in the membrane domains and the intracellular domain is important for G protein interaction. The primary sequences and the second messenger systems of the receptors indicate the 5-HT2 and 5-HT1c receptors are closely related, whereas the 5-HT1a receptor is more distantly related to the 5-HT2 and 5-HT1c receptors.
authors.affiliation: Department of Molecular Pharmacology and Toxicology, School of Pharmacy, University of Southern California, Los Angeles 90033.
authors.forename: J C
authors.initials: JC
authors.lastname: Shih
authors.forename: W
authors.initials: W
authors.lastname: Yang
authors.forename: K
authors.initials: K
authors.lastname: Chen
authors.forename: T
authors.initials: T
authors.lastname: Gallaher
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D003001:Cloning, Molecular; D019204:GTP-Binding Proteins / Q000378:metabolism; D008969:Molecular Sequence Data; D011985:Receptors, Serotonin / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D013329:Structure-Activity Relationship
chemical_list: D011985:Receptors, Serotonin; D019204:GTP-Binding Proteins