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• W2073048175 abstract "The catalytic rate constant of recombinant Photobacterium leiognathi Cu,Zn superoxide dismutase has been determined as a function of pH by pulse radiolysis. At pH 7 and low ionic strength (I = 0.02 M) the catalytic rate constant is 8.5 × 109 M-1 s-1, more than two times the value found for all the native eukaryotic Cu,Zn superoxide dismutases investigated to date. Similarly, Brownian dynamics simulations indicate an enzyme−substrate association rate more than two times higher than that found for bovine Cu,Zn superoxide dismutase. Titration of the paramagnetic contribution to the water proton relaxation rate of the P. leiognathi with increasing concentration of halide ions with different radii indicates that the proteic channel delimiting the active site is wider than 4.4 Å. This is at variance with that found on the eukariotic enzymes, and provides a rationale for the high catalytic rate of the bacterial enzyme. Evidence for solvent exposure of the active site different from that observed in the eukaryotic enzyme is suggested from the pH dependence of the water proton relaxation rate and of the EPR spectrum line shape, which indicate the occurrence of a prototropic equilibrium at pH 9.1 and 9.0, respectively. The pH dependence of the P. leiognathi catalytic rate has a trend different from that observed in the bovine enzyme, indicating that groups differently exposed to the solvent are involved in the modulation of the enzyme−substrate encounter." @default.
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• W2073048175 date "1998-08-12" @default.
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• W2073048175 title "Cu,Zn Superoxide Dismutase from <i>Photobacterium </i><i>l</i><i>eiognathi</i> Is an Hyperefficient Enzyme" @default.
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• W2073048175 doi "https://doi.org/10.1021/bi980563b" @default.
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