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    Insulin affects the ability of Gi to be ADP-ribosylated but does not elicit its phosphorylation in intact hepatocytes.

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    Authors
    Pyne, N J
    Heyworth, Clare M
    Balfour, N W
    Houslay, M D
    Affiliation
    Department of Biochemistry, University of Glasgow, Scotland, U.K.
    Issue Date
    1989-11-30
    
    Metadata
    Show full item record
    Abstract
    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.
    Citation
    Insulin affects the ability of Gi to be ADP-ribosylated but does not elicit its phosphorylation in intact hepatocytes. 1989, 165 (1):251-6 Biochem. Biophys. Res. Commun.
    Journal
    Biochemical and Biophysical Research Communications
    URI
    http://hdl.handle.net/10541/110977
    DOI
    10.1016/0006-291X(89)91062-0
    PubMed ID
    2511846
    Type
    Article
    Language
    en
    ISSN
    0006-291X
    ae974a485f413a2113503eed53cd6c53
    10.1016/0006-291X(89)91062-0
    Scopus Count
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    All Paterson Institute for Cancer Research

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