as reported earlier , under ordinary assay conditions ( 1.0 mm atp , 5 mm mg2+ , 30 degrees c , 10 min incubation ) the enzyme was activated 6-fold by epinephrine in the presence of the gtp analog , 5'-guanylyl-imidodiphosphate [ gmp-p ( nh ) p ] ( cooper , b. et al . ( 1975 ) j. clin . invest . 56 , 1350-1353 ) .
C0018353
gtp
C0018366
guanylyl-imidodiphosphate