Pyne, N J and Heyworth, C M and Balfour, N W and Houslay, M D (1989) Insulin affects the ability of Gi to be ADP-ribosylated but does not elicit its phosphorylation in intact hepatocytes. Biochemical and Biophysical Research Communications, 165 (1). pp. 251-256. ISSN 1090-2104Full text not available in this repository. (Request a copy from the Strathclyde author)
Insulin inhibited the ability of activated pertussis toxin to catalyse the ADP-ribosylation of alpha-Gi in isolated plasma membranes in either the absence of added guanine nucleotides or in the presence of GTP. In contrast, when the non-hydrolysable GTP analogue guanylyl-5'-imido-diphosphate (p[NH]ppG) was added to ribosylation mixtures, to inhibit the action of pertussis toxin in catalysing the ADP-ribosylation of alpha-Gi, then the addition of insulin attenuated the action of p[NH]ppG causing an increase in alpha-Gi ribosylation. Pre treatment of intact hepatocytes with insulin had no effect on the subsequent ability of thiol-preactivated pertussis toxin to cause the ADP-ribosylation of alpha Gi using isolated membranes from such cells. The ability of p[NH]ppG to inhibit forskolin-stimulated adenylate cyclase activity was attenuated in the presence of insulin. Insulin did not cause the phosphorylation of alpha-Gi in either intact hepatocytes or in isolated membranes.
|Keywords:||adenosine diphosphate ribose, adenylate cyclase, adenylate cyclase toxin, animals, cell membrane, cells, cultured, forskolin, GTP-binding proteins, guanylyl imidodiphosphate, insulin, kinetics, liver, male, pertussis toxin, phosphorylation, rats, rats, inbred strains, virulence factors, bordetella, Pharmacy and materia medica, Biochemistry, Cell Biology, Molecular Biology, Biophysics|
|Subjects:||Medicine > Pharmacy and materia medica|
|Department:||Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences|
|Depositing user:||Pure Administrator|
|Date Deposited:||14 Nov 2011 14:59|
|Last modified:||20 May 2016 03:46|