activation by gtp gamma s appeared to be mediated by a guanine nucleotide-binding ( g ) protein as gtp gamma s-stimulated [ 3h ] inositol phosphate production was inhibited by other nucleotides with a potency order of gtp = gdp = guanosine 5'- [ beta-thio ] diphosphate greater than itp greater than gmp greater than utp = ctp = adenosine 5'- [ gamma-thio ] triphosphate .
C0018328
guanine nucleotide
C0018340
gdp