these data suggest that the guanosyl nucleotide analogs act on the enzyme system by a slowly reversible process that possibly reflects slow binding and dissociation from different transition states of the enzyme system and suggest that activation of adenylate cyclase by gtp , gpp ( nh ) p , and gp ( ch2 ) pp does not involve covalent modification of the enzyme .
C0018353
gtp
C0018366
gpp ( nh ) p