Abstract
Rat glioma C6 BU1 cells contain a pertussis toxin substrate of 40 kDa which does not appear to be identical with G i,G o or transducin. The GTP analogue, GTP[γS], inhibited the rate of pertussis toxin-catalysed ADPribosylation of this protein, while the GDP analogue GDP[βS] stimulated this reaction. A protein of the same kDa value was ADPribosylated by cholera toxin in the absence of added guanine nucleotides. It is suggested that this 40 kDa protein can be a substrate for both cholera and pertussis toxins under appropriate conditions.
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