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The active site of the Cu,Zn superoxide dismutase from Escherichia coli in the oxidized Cu(II) state has been studied by nuclear magnetic relaxation dispersion (NMRD), optical and nuclear magnetic resonance spectroscopy. The orientation of some metal ligands is different with respect to all the other Cu,Zn superoxide dismutases. Moreover, NMRD measurements demonstrate the lack of a copper-coordinated...
Transient nuclear Overhauser effect (NOE) experiments were made with bovine Cu,Co Superoxide dismutase on the hyperfine shifted resonances of protons of the imidazole groups bound to the Cu.Zn cluster of the native enzyme. Assignments of lines based on the observed magnetization transfers were satisfactorily obtained only by altering the arrangement of the ligands around the catalytically active copper...
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