Pseudomonas aeruginosa azurin binds copper so tightly that it remains bound even upon polypeptide unfolding. Copper can be substituted with zinc without change in protein structure, and also in this complex the metal remains bound upon protein unfolding. Previous work has shown that native-state copper ligands Cys112 and His117 are two of at least three metal ligands in the unfolded state. In this study we use isothermal titration calorimetry and spectroscopic methods to test if the native-state ligand Met121 remains a metal ligand upon unfolding. From studies on a point-mutated version of azurin (Met121Ala) and a set of model peptides spanning the copper-binding C-terminal part (including Cys112, His117 and Met121), we conclude that Met121 is a metal ligand in unfolded copper-azurin but not in the case of unfolded zinc-azurin. Combination of unfolding and metal-titration data allow for determination of copper (Cu(II) and Cu(I)) and zinc affinities for folded and unfolded azurin polypeptides, respectively.
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