Fig 9.

Role of MdrA in regulation of the virB promoter activity. B. abortus P_virB-lacZ (wild type) (strain 2308), B. abortus ΔhutC P_virB-lacZ, B. abortus ΔmdrA P_virB-lacZ, B. abortus ΔhutC ΔmdrA P_virB-lacZ, and B. abortus ΔhutC ΔmdrA-KI P_virB-lacZ were grown in rich medium (TSB) until exponential phase (OD₆₀₀, 0.5 to 1). Subsequently, bacteria were harvested, and β-galactosidase activities were determined. Values are means ± standard deviations in Miller units (M.U.) of duplicate wells from a representative of three experiments. **, P < 0.01.