title: An ATP-driven proton pump in clathrin-coated vesicles.
abstract: Clathrin containing coated vesicles prepared from bovine brain catalyzed ATP-driven proton translocation and a 32Pi-ATP exchange reaction. Both activities were measured in the presence of 5 micrograms of oligomycin/mg of protein which completely inhibited these reactions catalyzed by submitochondrial particles. Analyses performed during the purification procedure demonstrated that the oligomycin-resistant pump was concentrated and highly purified in the fractions containing coated vesicles. Moreover, vesicles precipitated by either monoclonal or polyclonal antibodies against clathrin contained the H+ pump activity. Dicyclohexylcarbodiimide (0.5 mM) and N-ethylmaleimide (1 mM) added to the assay mixture inhibited the pump completely, whereas neither vanadate, sodium azide, efrapeptin, or mitochondrial ATPase inhibitor had an effect.
mesh_terms: D000251:Adenosine Triphosphatases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D000255:Adenosine Triphosphate / Q000378:metabolism*; D000818:Animals; D002417:Cattle; D002966:Clathrin; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008565:Membrane Proteins / Q000378:metabolism*; D008929:Mitochondria, Heart / Q000378:metabolism; D010710:Phosphates / Q000378:metabolism; D006180:Proton-Translocating ATPases; D013367:Submitochondrial Particles / Q000378:metabolism
chemical_list: D002966:Clathrin; D008565:Membrane Proteins; D010710:Phosphates; D000255:Adenosine Triphosphate; D000251:Adenosine Triphosphatases; D006180:Proton-Translocating ATPases