Neuropeptide Y inhibits pertussis toxin-catalyzed ADP-ribosylation in bovine adrenal chromaffin cell membranes.
Evidence is presented that the neuropeptide Y receptor is directly coupled to an inhibitory G protein existing in cultured bovine adrenal chromaffin cell membranes. Pertussis toxin catalyzes the [32P]ADP-ribosylation of a 41 kDa plasma membrane protein. 5'-Guanylylimidodiphosphate inhibited the [32P]ADP labelling of this protein in a dose-dependent manner whereas GTP had no effect. Preincubation of the plasma membranes with high concentrations of neuropeptide Y followed by a brief exposure to a low concentration of 5'-guanylylimidodiphosphate significantly inhibited ADP-ribosylation beyond that observed with 5'-guanylylimidodiphosphate alone. These results suggest that the neuropeptide Y receptor in bovine adrenal chromaffin cells is directly coupled to a 41 kDa PTX substrate (presumably the alpha subunit of an inhibitory G protein).
Department of Pharmacology, University of Nebraska Medical Center, Omaha 68198-6260.
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D000246:Adenosine Diphosphate Ribose / Q000378:metabolism*; D000313:Adrenal Medulla / Q000378:metabolism*; D000818:Animals; D002417:Cattle; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism; D002478:Cells, Cultured; D006160:Guanosine Triphosphate / Q000494:pharmacology; D006165:Guanylyl Imidodiphosphate / Q000494:pharmacology; D007700:Kinetics; D008565:Membrane Proteins / Q000302:isolation & purification / Q000378:metabolism; D009243:NAD / Q000378:metabolism*; D009478:Neuropeptide Y / Q000494:pharmacology*; D037342:Pertussis Toxin; D010566:Virulence Factors, Bordetella / Q000037:antagonists & inhibitors / Q000494:pharmacology*
D008565:Membrane Proteins; D009478:Neuropeptide Y; D010566:Virulence Factors, Bordetella; D009243:NAD; D000246:Adenosine Diphosphate Ribose; D006165:Guanylyl Imidodiphosphate; D006160:Guanosine Triphosphate; D037342:Pertussis Toxin