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• W1986720193 abstract "The Fourier transform infrared (FTIR) spectrum of the complex between prephenate and the monofunctional chorismate mutase from Bacillus subtilis displays one prominent band at 1714 cm-1. Using isotopically-labeled ligand, we have shown that this band corresponds to the ketonic carbonyl stretching vibration of enzyme-bound prephenate. The frequency of this carbonyl vibration of prephenate does not change significantly on binding to the protein. These data indicate that chorismate mutase does not use electrophilic catalysis in the rearrangement of chorismate. A comparison of the resolution-enhanced FTIR spectra of the unliganded mutase and of the protein complexed with its ligands reveals marked differences in the amide I' vibration band. These changes suggest that structural alterations in the protein occur upon binding prephenate. When combined with information from the crystal structure of the enzyme and its complexes, it appears that significant ordering of the C-terminal region occurs upon ligand binding. These changes at the active site may be important for efficient catalysis and likely influence the association and dissociation rates of the enzyme and its ligands. The enzymic rearrangement of chorismate evidently proceeds via a pericyclic process, and much, if not all, of the rate acceleration derives from the selective binding of the appropriate conformer of the substrate, with some additional contribution possible from electrostatic stabilization of the transition state." @default.
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• W1986720193 date "1994-08-01" @default.
• W1986720193 modified "2023-10-04" @default.
• W1986720193 title "Monofunctional Chorismate Mutase from Bacillus subtilis: FTIR Studies and the Mechanism of Action of the Enzyme" @default.
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• W1986720193 doi "https://doi.org/10.1021/bi00199a018" @default.
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