title: GTP-binding proteins in bovine brain nuclear membranes.
abstract: Nuclear membranes and other subcellular fractions derived from bovine brain cortex were investigated for the existence of GTP-binding proteins. By using photolytic labeling with [alpha-32P]GTP a 29 kDa GTP-binding protein was shown to be present in nuclear membranes which was not present in the plasma membranes nor in microsomal or cytosolic fractions. Two-dimensional gel electrophoresis revealed that this protein is rather acidic with a pI lower than 4.5. Members of the heterotrimeric Gi/o family are not present in the nuclear envelope: a 39 kDa protein, ADP ribosylated by pertussis toxin, was shown to originate from plasma membrane contamination.
authors.affiliation: Arbeitsgruppe Neurochemie, Institut für Biochemie, Freie Universität Berlin, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Otto
authors.forename: K
authors.initials: K
authors.lastname: Buchner
authors.forename: R
authors.initials: R
authors.lastname: Beckmann
authors.forename: R
authors.initials: R
authors.lastname: Hilbert
authors.forename: F
authors.initials: F
authors.lastname: Hucho
mesh_terms: D000246:Adenosine Diphosphate Ribose / Q000378:metabolism; D000818:Animals; D001345:Autoradiography; D002417:Cattle; D002458:Cell Fractionation; D002462:Cell Membrane / Q000378:metabolism; D002540:Cerebral Cortex / Q000378:metabolism*; D015180:Electrophoresis, Gel, Two-Dimensional; D004591:Electrophoresis, Polyacrylamide Gel; D019204:GTP-Binding Proteins / Q000302:isolation & purification / Q000378:metabolism*; D006160:Guanosine Triphosphate / Q000378:metabolism*; D008861:Microsomes / Q000378:metabolism; D008970:Molecular Weight; D009243:NAD / Q000378:metabolism; D009685:Nuclear Envelope / Q000378:metabolism*; D037342:Pertussis Toxin; D010761:Phosphorus Radioisotopes; D010782:Photolysis; D010566:Virulence Factors, Bordetella / Q000378:metabolism
chemical_list: D010761:Phosphorus Radioisotopes; D010566:Virulence Factors, Bordetella; D009243:NAD; D000246:Adenosine Diphosphate Ribose; D006160:Guanosine Triphosphate; D037342:Pertussis Toxin; D019204:GTP-Binding Proteins