Biological and Pharmaceutical Bulletin
Online ISSN : 1347-5215
Print ISSN : 0918-6158
ISSN-L : 0918-6158
Functional Gene Cloning and Characterization of the SsmE Multidrug Efflux Pump from Serratia marcescens
Yusuke MinatoFereshteh ShahcheraghiWakano OgawaTeruo KurodaTomofusa Tsuchiya
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2008 Volume 31 Issue 3 Pages 516-519


We cloned a gene responsible for multidrug resistance from chromosomal DNA of Serratia marcescens, and determined the nucleotide sequence. We designated the gene as ssmE. The deduced amino acid sequence of SsmE showed high similarity with the small multidrug resistance (SMR)-type multidrug efflux pumps. Cells of Escherichia coli KAM32, a drug hyper-susceptible mutant, transformed with a plasmid pESM437 carrying the ssmE gene showed elevated minimum inhibitory concentrations of structurally unrelated antimicrobial agents. E. coli KAM32/pESM437 showed elevated energy dependent efflux of ethidium. Reverse transcriptase polymerase chain reaction (RT-PCR) analysis revealed that ssmE was expressed in cells of S. marcescens.

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© 2008 The Pharmaceutical Society of Japan
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