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Comparison of spectra from copper titration into wild type and C57S SOD1. A–C, apo human WT SOD1 (A), apo C57S SOD1 (B), and as-isolated C57S SOD (C) (0.0 copper and 4.0 equivalents zinc), all in 100 mm acetate buffer at pH 5.5. Spectrum a, 1 equivalent Cu2+ per dimer; spectrum b, 2 equivalents Cu2+ per dimer. Squares and diamonds symbolize the zinc-binding and the copper-binding sites, respectively.
