Abstract
Truncated, steady state and transient NOE experiments have been performed on bovine Cu 2Co 2 Superoxide dismutase. The effectiveness of the different NOE experiments in the general case of paramagnetic macromolecules is discussed. It is concluded that steady state NOEs give superior results. The validity of the two spins approximation is discussed, and NOE values for a fully coupled set of nuclei have been calculated. Transient NOE experiments, when properly performed, confirm the previous assignment of the hyperfine shifted signals in Cu 2Co 2SOD based on steady state NOE measurements [(1989) Inorg. Chem. 28, 4650] and eliminate any further reason of controversy on an important issue as the assignment of the 1H NMR signals of protons of metal-coordinated imidazoles.
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