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Journal of Bacteriology, October 2001, p. 5803-5812, Vol. 183, No. 20
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.20.5803-5812.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Analysis of a Complete Library of Putative Drug Transporter Genes in Escherichia coli

Kunihiko Nishino and Akihito Yamaguchi*

Department of Cell Membrane Biology, Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Faculty of Pharmaceutical Science, Osaka University, Suita, Osaka 565-0871, and CREST, Japan Science and Technology Corporation, Osaka 567-0047, Japan

Received 16 April 2001/Accepted 17 July 2001

The complete sequencing of bacterial genomes has revealed a large number of drug transporter genes. In Escherichia coli, there are 37 open reading frames (ORFs) assumed to be drug transporter genes on the basis of sequence similarities, although the transport capabilities of most of them have not been established yet. We cloned all 37 putative drug transporter genes in E. coli and investigated their drug resistance phenotypes using an E. coli drug-sensitive mutant as a host. E. coli cells transformed with a plasmid carrying one of 20 ORFs, i.e., fsr, mdfA, yceE, yceL, bcr, emrKY, emrAB, emrD, yidY, yjiO, ydhE, acrAB, cusA (formerly ybdE), yegMNO, acrD, acrEF, yhiUV, emrE, ydgFE, and ybjYZ, exhibited increased resistance to some of the 26 representative antimicrobial agents and chemical compounds tested in this study. Of these 20 ORFs, cusA, yegMNO, ydgFE, yceE, yceL, yidY, and ybjYZ are novel drug resistance genes. The fsr, bcr, yjiO, ydhE, acrD, and yhiUV genes gave broader resistance spectra than previously reported.

* Corresponding author. Mailing address: Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki-shi, Osaka 567-0047, Japan. Phone: 81-6-6879-8545. Fax: 81-6-6879-8549. E-mail: akihito{at}sanken.osaka-u.ac.jp.

Journal of Bacteriology, October 2001, p. 5803-5812, Vol. 183, No. 20
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.20.5803-5812.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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