Abstract
The comparative accessibility of the active sites of hemocyanin and tyrosinase, two proteins containing a binuclear type-3 copper site, has been investigated. The approaches were: (a) the kinetic study of the reaction of hemocyanin with cyanide in the presence of conformation perturbants; (b) the comparison between the kinetic parameters of the cyanide reaction on hemocyanin and tyrosinase; (c) the study of the efficiency and reaction mechanism of hemocyanin interaction with a typical tyrosinase substrate like catechol. The results indicate that the active site of tyrosinase is much more exposed than that of hemocyanin.
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