Data S1. Cu(I) binding to CopAa.

Fig. S1. Far-UV CD spectrum of CopAa.

Fig. S2. Proton and Cu(I) binding to CopAa and the mechanism of Cu(I) exchange between CopAa and BCS.

Table S1. Determination of CopAa Cu(I)-binding affinity through competition with BCS.

Table S2. pH dependence of Cu(I) binding to CopAa.

Table S3. Calculation of pH-independent values of Kex and β2.

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