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The antiserum AS7 can specifically immunoprecipitate α-G i from membrane extracts as well as from a mixture of purified α-G i and α-G o . as ascertained using [ 32 P]ADP-ribosylated G-proteins. Using this antiserum to immunoprecipitate α-G i from hepatocytes labelled with 32 P it was evident that α-G i was phosphorylated under basal...
An affinity purified human insulin receptor preparation was shown to phosphorylate the α- and β-subunits of the guanine nucleotide-regulatory proteins G i and G o , derived from bovine brain. The presence of insulin stimulated the rate of their phosphorylation some 2-fold. The presence of G i and G o did not affect the degree of autophosphorylation of the β-subunit...
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