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CCCP inhibitor assay confirmed that RIA_1117, RIA_1118 and RIA_1119 proteins mediated amikacin, streptomycin and SDS resistance depending on proton motive force (PMF). Spot assay and streptomycin accumulation assay confirmed that RIA_1117, RIA_1118 and RIA_1119 proteins contributed to export streptomycin, and CCCP increased the accumulation of streptomycin. Furthermore, RIA_1117, RIA_1118 and RIA_1119 proteins also were involved in the fitness and virulence of RA-GD strain. These results showed that RIA_1117-RIA_1118-RIA_1119 operon encoded a RND efflux sys