Gene vmrA, cloned from Vibrio parahaemolyticus, made Escherichia coli resistant to 4',6-diamino-2-phenylindol, tetraphenylphosphonium chloride, acriflavine, and ethidium bromide. VmrA belongs to the DinF branch of MATE family efflux transporters. VmrA catalyzed acriflavine efflux and showed Na(+)/drug transporter activity because the addition of tetraphenylphosphonium to Na(+)-loaded cells caused Na(+) efflux.
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Chen et al. (2002) studied this question.
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