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Complementation of ΔcusRS by cusRS or pcoRS. The expression of β-galactosidase from PpcoA-lacZ (A), PpcoE-lacZ (B), or PcusC-lacZ (C) reporter prophage was assayed after addition of CuSO4 to the growth medium of E. coli strain DLG (ΔcusRS) transformed with plasmids carrying pcoRS (●), cusRS (▵), or a vector control (□). Each point is the mean of at least three enzymatic assays, with error bars showing the standard deviation of the mean.
