The acrAB locus encode the efflux pump AcrAB,which confers multidrug tolerance,controlled by the regulon marRAB. Mutation in the gyrase and topoisomerase IV lead to fluoroquinolones resistance, mainly arise in gyrA and parC genes.

• AcrAB外流泵系统的合成有多重耐药调节子 (marRAB)调控 ,AcrAB与多种抗生素的耐药有关。 拓扑异构酶 (topoisomerase)的突变主要与氟喹诺酮类药物的耐药性有关 ,突变主要发生在gyrA ,parC基因上