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- W2045124310 abstract "Phosphorylase b (E.C. 2.4.1.1), prepared from rabbit skeletal muscle, was used to study whether the binding of allosteric ligands modifies the intramolecular dynamics of the protein matrix. Protein dynamics were monitored through the fluorescence and phosphorescence parameters of the 12 tryptophan (Trp) residues (one monomer) of the enzyme. The phosphorescence lifetime was measured at room temperature both in the absence and the presence of ligands. The addition of an allosteric inhibitor (ATP) decreased the lifetime, while the presence of activator (AMP) and/or substrate (G-1-P) had no detectable effect. The lifetime data allow us to conclude that the environment of the buried tryptophans becomes more flexible upon the binding of ATP, while the other ligands did not induce such change. The ATP-induced perturbation was also examined by the quenching of Trp fluorescence by acrylamide. The quenching parameters did not show any change, suggesting that the effect of ATP is localized to the vicinity of the phosphorescent Trp residues." @default.
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- W2045124310 date "1998-01-01" @default.
- W2045124310 modified "2023-09-26" @default.
- W2045124310 title "Alteration of the intramolecular dynamics of glycogen phosphorylase b by allosteric ligands" @default.
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- W2045124310 doi "https://doi.org/10.1016/s1011-1344(97)00119-x" @default.
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