title: Identification of GTP-binding proteins in the plasma membrane of higher plants.
abstract: Antisera raised against a highly conserved amino acid sequence (G alpha-common peptide) of animal Gs alpha, Gi alpha, Go alpha and Gt alpha recognize, in plasma membranes of several higher plants, sets of proteins of Mr = 37 and 31 kDa (Vicia faba), 36 and 31 kDa (Arabidopsis thaliana) and 38 and 34 kDa (Commelina communis). The A. thaliana proteins were solubilized and partially purified. They bind [35S]GTP gamma S with high affinity (apparent Kd approximately 10 nM) and, with lower affinity, GTP but not the other nucleotides tested (ATP, CTP, ITP, UTP).
mesh_terms: D015153:Blotting, Western; D002462:Cell Membrane / Q000032:analysis; D002499:Centrifugation, Density Gradient; D004591:Electrophoresis, Polyacrylamide Gel; D019204:GTP-Binding Proteins / Q000032:analysis* / Q000378:metabolism; D016244:Guanosine 5'-O-(3-Thiotriphosphate); D006160:Guanosine Triphosphate / Q000031:analogs & derivatives / Q000378:metabolism; D008861:Microsomes / Q000378:metabolism; D008970:Molecular Weight; D009711:Nucleotides / Q000378:metabolism; D010944:Plants / Q000032:analysis*; D013873:Thionucleotides / Q000378:metabolism
chemical_list: D009711:Nucleotides; D013873:Thionucleotides; D016244:Guanosine 5'-O-(3-Thiotriphosphate); D006160:Guanosine Triphosphate; D019204:GTP-Binding Proteins