Abstract
The interaction of fluoride with copper zinc superoxide dismutase (SOD) has been reinvestigated by using both bovine and yeast isoenzymes. The affinity of anions for the latter isoenzyme is larger, and this avoids much of the ionic strength effects connected with weak binding ligands. 19 F NMR studies on fluoride in presence of yeast SOD confirm that the anion binds the copper ion. 1 H NMR studies of the Cu 2 Co 2 SOD derivatives in the presence of F − indicate that no ligand is removed from coordination
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