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  • Title: Bovine brain coated vesicles contain guanine nucleotide regulatory proteins.
    Author: Moroi K, Kuga T, Kadota K.
    Journal: Jpn J Pharmacol; 1991 Mar; 55(3):399-402. PubMed ID: 1906955.
    Abstract:
    Binding of [3H]guanosine triphosphate (GTP) with a high affinity was found to be present in the coated vesicle fraction prepared from bovine cerebral cortex. The binding was saturable and displaced by 1 microM of GTP, guanosine diphosphate and guanosine 5'-(3-O-thio)triphosphate. Incubation of the vesicles with islet-activating protein and [32P]NAD resulted in ADP-ribosylation of a 39,000-41,000-dalton polypeptide. Antibodies to the alpha-subunit of stimulatory guanine nucleotide regulatory proteins (G-proteins) immunoblotted 52,000- and 45,000-dalton polypeptides. The results indicated that stimulatory and inhibitory G-proteins are contained in a fraction of the bovine brain coated vesicles.
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