[Chemical reactivity of an essential arginine residue in substrate binding, reflecting the state of activation of glycogen phosphorylase in rabbit muscle].
Arginine residues have been shown to be present in the binding sites of both phosphorylated substrates and nucleotide activators of glycogen phosphorylase. The former residue can only be modified by arginine-directed reagents when the enzyme is activated, i. e. in phosphorylase a, or in phosphorylase b in the presence of activators. Conversely, after this residue has been modified, phosphorylase b is irreversibly blocked in an active conformation.
D000249:Adenosine Monophosphate / Q000494:pharmacology; D000818:Animals; D001120:Arginine; D001665:Binding Sites; D002074:Butanones / Q000494:pharmacology*; D003931:Diacetyl / Q000494:pharmacology*; D004789:Enzyme Activation; D007700:Kinetics; D009132:Muscles / Q000201:enzymology*; D010762:Phosphorylase a / Q000378:metabolism; D010763:Phosphorylase b / Q000378:metabolism; D006005:Phosphorylases / Q000378:metabolism*; D011485:Protein Binding; D011487:Protein Conformation; D011817:Rabbits
D002074:Butanones; D000249:Adenosine Monophosphate; D001120:Arginine; D010762:Phosphorylase a; D010763:Phosphorylase b; D006005:Phosphorylases; D003931:Diacetyl
La réactivité chimique d'un résidu arginine essentiel à la fixation des substrats, reflète l'état d'activation de la glycogène phosphorylase du muscle de lapin.