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Organic hydroperoxide-dependent regulation of the X. campestris ohrR P1 promoter by wild-type and mutant OhrRs. β-Galactosidase activities of exponential-phase cultures of various XpP1lacZ transcriptional fusion strains (15, 17) expressing wild-type and C22S, C127S, and C131S mutant OhrRs were either induced with 100 μM CHP for 30 min (gray bars) or untreated (black bars). The values presented are the means and standard deviations of three independent experiments.
