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AbstractCyclic voltammetry has been used to determine the reduction potentials of blue (Pseudomonas aeruginosa azurin) and purple (Thermus thermophilus CuA domain) copper proteins unfolded by guanidine hydrochloride. These Cu(II/I) potentials [456 (azurin); 453 (CuA) mV vs., NHE] are higher than those of the folded proteins. The downshift of the potential in the folded state can be accounted for by...
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