title: Glucagon1-6 binds to the glucagon receptor and activates hepatic adenylate cyclase.
abstract: A fragment of glucagon encompassing its first six NH2-terminal residues (His-Ser-Gln-Gly-Thr-Phe) binds to the glucagon receptor and stimulates adenylate cyclase activity in rat liver plasma membranes. Glucagon1-6 is a partial agonist since it stimulates, at saturating concentrations, to the extent of 75% of the maximal activity given by the native hormone. The binding affinity and potency of glucagon1-6 are 0.001% the native hormone. Discussed are the implications of these findings on the structure-function relationships required for the action of glucagon and for preparing clinically useful analogs of the hormone.
mesh_terms: D000262:Adenylyl Cyclases / Q000378:metabolism*; D000818:Animals; D004789:Enzyme Activation; D005934:Glucagon / Q000378:metabolism* / Q000494:pharmacology; D007700:Kinetics; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D009842:Oligopeptides / Q000378:metabolism* / Q000494:pharmacology; D051381:Rats; D011956:Receptors, Cell Surface / Q000378:metabolism*
chemical_list: D009842:Oligopeptides; D011956:Receptors, Cell Surface; D005934:Glucagon; D000262:Adenylyl Cyclases