Activation of the acrAB operon is achieved through the direct binding of a positive regulator of the AraC/XylS family , to the operator regions of these genes .
Activation of the acrAB operon is achieved through the direct binding of a positive regulator of the AraC/XylS family , to the operator regions of these genes .
For example , acrAB transcription in Salmonella is controlled by the AraC/XylS-like regulators RamA .