title: Synergistic effect of AMP and fructose 2,6-bisphosphate on the protection of fructose 1,6-bisphosphatase against inactivation by trypsin.
abstract: The rate of inactivation of chicken liver fructose 1,6-bisphosphatase by trypsin is reduced if the digestive reaction is conducted in the presence of AMP or fructose 2,6-bisphosphate. The effects of these 2 compounds are synergistic. Although fructose 1,6-bisphosphate does not protect the enzyme against tryptic inactivation, it can enhance the effect of AMP. Selective modification of the AMP allosteric site of fructose 1,6-bisphosphatase with pyridoxal-P and NaBH4 renders the enzyme more resistant to tryptic inactivation, but the modified enzyme is no longer responsive to the protective effect of AMP.
mesh_terms: D000249:Adenosine Monophosphate / Q000494:pharmacology*; D000495:Allosteric Site / Q000187:drug effects; D000818:Animals; D002645:Chickens; D004357:Drug Synergism; D006597:Fructose-Bisphosphatase / Q000037:antagonists & inhibitors*; D005635:Fructosediphosphates / Q000494:pharmacology*; D006598:Hexosediphosphates / Q000494:pharmacology*; D007700:Kinetics; D008099:Liver / Q000201:enzymology; D014357:Trypsin / Q000494:pharmacology*
chemical_list: D005635:Fructosediphosphates; D006598:Hexosediphosphates; D000249:Adenosine Monophosphate; C027652:fructose 2,6-diphosphate; D006597:Fructose-Bisphosphatase; D014357:Trypsin