title: Prostaglandin E1 receptor from mouse mastocytoma P-815 cells couples to 60 kDa GTP-binding protein.
abstract: The stable [3H]prostaglandin E1 (PGE1)-bound receptor, which couples to 60 kDa GTP-binding protein, from membranes of mouse mastocytoma P-815 cells has been purified and characterized. When the membranes were preincubated with [3H]PGE1 for 60 min at 37 degrees C, the dissociation of the ligand from the receptor was remarkably decreased, even in the presence of GTP gamma S. The stable [3H]PGE1-bound receptor complex was solubilized with 6% digitonin. The solubilized [3H]PGE1 receptor was eluted with [35S]GTP gamma S bindings activity from an Ultrogel AcA44 column. The fractions containing activities of both [3H]PGE1 and [35S]GTP gamma S bindings were further purified by column chromatographies on wheat germ agglutinin (WGA)-agarose and phenyl-Sepharose CL-4B. The partially purified [3H]PGE1-bound receptor was affinity-labeled with [14C]5'-p-fluorosulfonylbenzoylguanosine and a protein with a molecular mass of 60 kDa was detected. These results suggest that the ligand-bound PGE1 receptor of P-815 cells associates with a novel GTP-binding protein with a molecular mass of 60 kDa.
authors.affiliation: Department of Physiological Chemistry, Faculty of Pharmaceutical Sciences, Kyoto University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Hashimoto
authors.forename: R
authors.initials: R
authors.lastname: Ogino
authors.forename: H
authors.initials: H
authors.lastname: Saeki
authors.forename: K
authors.initials: K
authors.lastname: Yatsunami
authors.forename: A
authors.initials: A
authors.lastname: Ichikawa
mesh_terms: D000262:Adenylyl Cyclases / Q000378:metabolism; D000818:Animals; D002845:Chromatography; D019204:GTP-Binding Proteins / Q000378:metabolism*; D016244:Guanosine 5'-O-(3-Thiotriphosphate) / Q000378:metabolism; D006160:Guanosine Triphosphate / Q000378:metabolism; D007700:Kinetics; D051379:Mice; D011458:Prostaglandins E / Q000378:metabolism*; D011982:Receptors, Prostaglandin / Q000302:isolation & purification / Q000378:metabolism*; D018078:Receptors, Prostaglandin E; D015398:Signal Transduction; D014407:Tumor Cells, Cultured
chemical_list: D011458:Prostaglandins E; D011982:Receptors, Prostaglandin; D018078:Receptors, Prostaglandin E; D016244:Guanosine 5'-O-(3-Thiotriphosphate); D006160:Guanosine Triphosphate; D019204:GTP-Binding Proteins; D000262:Adenylyl Cyclases