The periplasmic linker protein component of an antibiotic efflux pump. Confers resistance to numerous structurally unrelated antibiotics such as carbenicillin, chloramphenicol, erythromycin, novobiocin, streptomycin and tetracycline. Is not involved in organic solvent efflux. The arpABC operon was not seen to be induced by carbenicillin, chloramphenicol, erythromycin nor by hexane, toluene or p-xylene. Belongs to the membrane fusion protein (MFP) (TC 8.A.1) family. Despite being nearly identical to the ttgABC operon in strain DOT-T1E and the mepABC operon in strain KT2442-TOL this operon does not function in solvent efflux. This may be due to different protein expression levels. In strain KT2440 the equivalent operon does not seem to function in toluene efflux.