title: Specificity of the thrombin receptor for agonist peptide is defined by its extracellular surface.
abstract: G-protein-coupled receptors for catecholamines and some other small ligands are activated when agonists bind to the transmembrane region of the receptor. The docking interactions through which peptide agonists activate their receptors are less well characterized. The thrombin receptor is a specialized peptide receptor. It is activated by binding its tethered ligand domain, which is unmasked upon receptor cleavage by thrombin. Human and Xenopus thrombin receptor homologues are each selectively activated by the agonist peptide representing their respective tethered ligand domains. Here we identify receptor domains that confer this agonist specificity by replacing the Xenopus receptor's aminoterminal exodomain and three extracellular loops with the corresponding human structures. This switches receptor specificity from Xenopus to human. The specificity of these thrombin receptors for their respective peptide agonists is thus determined by their extracellular surfaces. Our results indicate that agonist interaction with extracellular domains is important for thrombin receptor activation.
authors.affiliation: Cardiovascular Research Institute, University of California, San Francisco 94143-0524.
authors.forename: R E
authors.initials: RE
authors.lastname: Gerszten
authors.forename: J
authors.initials: J
authors.lastname: Chen
authors.forename: M
authors.initials: M
authors.lastname: Ishii
authors.forename: K
authors.initials: K
authors.lastname: Ishii
authors.forename: L
authors.initials: L
authors.lastname: Wang
authors.forename: T
authors.initials: T
authors.lastname: Nanevicz
authors.forename: C W
authors.initials: CW
authors.lastname: Turck
authors.forename: T K
authors.initials: TK
authors.lastname: Vu
authors.forename: S R
authors.initials: SR
authors.lastname: Coughlin
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002460:Cell Line; D006801:Humans; D008024:Ligands; D008969:Molecular Sequence Data; D010446:Peptide Fragments / Q000378:metabolism*; D051381:Rats; D018179:Receptors, Thrombin / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013329:Structure-Activity Relationship; D014981:Xenopus
chemical_list: D008024:Ligands; D010446:Peptide Fragments; D018179:Receptors, Thrombin; D011993:Recombinant Fusion Proteins; C082835:thrombin receptor peptide (42-47)